Publish

- @0x/contracts-asset-proxy@3.7.8-multiplex.0
 - @0x/contracts-broker@1.1.26-multiplex.0
 - @0x/contracts-coordinator@3.1.27-multiplex.0
 - @0x/contracts-dev-utils@1.3.25-multiplex.0
 - @0x/contracts-erc1155@2.1.26-multiplex.0
 - @0x/contracts-erc20@3.3.5-multiplex.0
 - @0x/contracts-erc721@3.1.26-multiplex.0
 - @0x/contracts-exchange-forwarder@4.2.27-multiplex.0
 - @0x/contracts-exchange-libs@4.3.26-multiplex.0
 - @0x/contracts-exchange@3.2.27-multiplex.0
 - @0x/contracts-extensions@6.2.21-multiplex.0
 - @0x/contracts-integrations@2.7.29-multiplex.0
 - @0x/contracts-multisig@4.1.27-multiplex.0
 - @0x/contracts-staking@2.0.34-multiplex.0
 - @0x/contracts-test-utils@5.3.23-multiplex.0
 - @0x/contracts-treasury@1.1.0-multiplex
 - @0x/contracts-utils@4.7.5-multiplex.0
 - @0x/contracts-zero-ex@0.20.0-multiplex
 - @0x/asset-swapper@6.3.0-multiplex
 - @0x/contract-artifacts@3.13.0-multiplex
 - @0x/contract-wrappers-test@12.2.38-multiplex.0
 - @0x/contract-wrappers@13.14.0-multiplex
 - @0x/migrations@7.0.1-multiplex.0
 - @0x/order-utils@10.4.18-multiplex.0
 - @0x/protocol-utils@1.3.1-multiplex.0

contracts/asset-proxy/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "3.7.10",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "3.7.9",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "3.7.8",
+        "timestamp": 1615932869,
+        "version": "3.7.8-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/asset-proxy/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v3.7.10 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v3.7.9 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v3.7.8 - _March 17, 2021_
+## v3.7.8-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/asset-proxy/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-asset-proxy",
-    "version": "3.7.10",
+    "version": "3.7.8-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,15 +51,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contract-wrappers": "^13.16.0",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contract-wrappers": "^13.14.0-multiplex",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
+        "@0x/tslint-config": "^4.1.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -67,7 +67,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereumjs-util": "^7.0.10",
+        "ethereumjs-util": "^5.1.1",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -76,20 +76,20 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-erc1155": "^2.1.28",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
-        "ethereum-types": "^3.5.0",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-erc1155": "^2.1.26-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/asset-proxy/test/dex_forwarder_bridge.ts

@@ -0,0 +1,354 @@
+import { ContractTxFunctionObj } from '@0x/contract-wrappers';
+import {
+    blockchainTests,
+    constants,
+    expect,
+    filterLogsToArguments,
+    getRandomInteger,
+    randomAddress,
+    shortZip,
+} from '@0x/contracts-test-utils';
+import { BigNumber, hexUtils, NULL_ADDRESS } from '@0x/utils';
+import { DecodedLogs } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { DexForwarderBridgeCall, dexForwarderBridgeDataEncoder } from '../src/dex_forwarder_bridge';
+
+import { artifacts } from './artifacts';
+import {
+    TestDexForwarderBridgeBridgeTransferFromCalledEventArgs as BtfCalledEventArgs,
+    TestDexForwarderBridgeContract,
+    TestDexForwarderBridgeEvents as TestEvents,
+} from './wrappers';
+
+const { ZERO_AMOUNT } = constants;
+
+blockchainTests.resets('DexForwarderBridge unit tests', env => {
+    let testContract: TestDexForwarderBridgeContract;
+    let inputToken: string;
+    let outputToken: string;
+    const BRIDGE_SUCCESS = '0xdc1600f3';
+    const BRIDGE_FAILURE = '0xffffffff';
+    const BRIDGE_REVERT_ERROR = 'oopsie';
+    const NOT_AUTHORIZED_REVERT = 'DexForwarderBridge/SENDER_NOT_AUTHORIZED';
+    const DEFAULTS = {
+        toAddress: randomAddress(),
+    };
+
+    before(async () => {
+        testContract = await TestDexForwarderBridgeContract.deployFrom0xArtifactAsync(
+            artifacts.TestDexForwarderBridge,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+        // Create test tokens.
+        [inputToken, outputToken] = [
+            await callAndTransactAsync(testContract.createToken()),
+            await callAndTransactAsync(testContract.createToken()),
+        ];
+        await callAndTransactAsync(testContract.setAuthorized(env.txDefaults.from as string));
+    });
+
+    async function callAndTransactAsync<TResult>(fnCall: ContractTxFunctionObj<TResult>): Promise<TResult> {
+        const result = await fnCall.callAsync();
+        await fnCall.awaitTransactionSuccessAsync({}, { shouldValidate: false });
+        return result;
+    }
+
+    function getRandomBridgeCall(
+        bridgeAddress: string,
+        fields: Partial<DexForwarderBridgeCall> = {},
+    ): DexForwarderBridgeCall {
+        return {
+            target: bridgeAddress,
+            inputTokenAmount: getRandomInteger(1, '100e18'),
+            outputTokenAmount: getRandomInteger(1, '100e18'),
+            bridgeData: hexUtils.leftPad(inputToken),
+            ...fields,
+        };
+    }
+
+    describe('bridgeTransferFrom()', () => {
+        let goodBridgeCalls: DexForwarderBridgeCall[];
+        let revertingBridgeCall: DexForwarderBridgeCall;
+        let failingBridgeCall: DexForwarderBridgeCall;
+        let allBridgeCalls: DexForwarderBridgeCall[];
+        let totalFillableOutputAmount: BigNumber;
+        let totalFillableInputAmount: BigNumber;
+        let recipientOutputBalance: BigNumber;
+
+        beforeEach(async () => {
+            goodBridgeCalls = [];
+            for (let i = 0; i < 4; ++i) {
+                goodBridgeCalls.push(await createBridgeCallAsync({ returnCode: BRIDGE_SUCCESS }));
+            }
+            revertingBridgeCall = await createBridgeCallAsync({ revertError: BRIDGE_REVERT_ERROR });
+            failingBridgeCall = await createBridgeCallAsync({ returnCode: BRIDGE_FAILURE });
+            allBridgeCalls = _.shuffle([failingBridgeCall, revertingBridgeCall, ...goodBridgeCalls]);
+
+            totalFillableInputAmount = BigNumber.sum(...goodBridgeCalls.map(c => c.inputTokenAmount));
+            totalFillableOutputAmount = BigNumber.sum(...goodBridgeCalls.map(c => c.outputTokenAmount));
+
+            // Grant the taker some output tokens.
+            await testContract.setTokenBalance(
+                outputToken,
+                DEFAULTS.toAddress,
+                (recipientOutputBalance = getRandomInteger(1, '100e18')),
+            );
+        });
+
+        async function setForwarderInputBalanceAsync(amount: BigNumber): Promise<void> {
+            await testContract
+                .setTokenBalance(inputToken, testContract.address, amount)
+                .awaitTransactionSuccessAsync({}, { shouldValidate: false });
+        }
+
+        async function createBridgeCallAsync(
+            opts: Partial<{
+                returnCode: string;
+                revertError: string;
+                callFields: Partial<DexForwarderBridgeCall>;
+                outputFillAmount: BigNumber;
+            }>,
+        ): Promise<DexForwarderBridgeCall> {
+            const { returnCode, revertError, callFields, outputFillAmount } = {
+                returnCode: BRIDGE_SUCCESS,
+                revertError: '',
+                ...opts,
+            };
+            const bridge = await callAndTransactAsync(testContract.createBridge(returnCode, revertError));
+            const call = getRandomBridgeCall(bridge, callFields);
+            await testContract
+                .setBridgeTransferAmount(call.target, outputFillAmount || call.outputTokenAmount)
+                .awaitTransactionSuccessAsync({}, { shouldValidate: false });
+            return call;
+        }
+
+        async function callBridgeTransferFromAsync(opts: {
+            bridgeData: string;
+            sellAmount?: BigNumber;
+            buyAmount?: BigNumber;
+        }): Promise<DecodedLogs> {
+            // Fund the forwarder with input tokens to sell.
+            await setForwarderInputBalanceAsync(opts.sellAmount || totalFillableInputAmount);
+            const call = testContract.bridgeTransferFrom(
+                outputToken,
+                testContract.address,
+                DEFAULTS.toAddress,
+                opts.buyAmount || totalFillableOutputAmount,
+                opts.bridgeData,
+            );
+            const returnCode = await call.callAsync();
+            if (returnCode !== BRIDGE_SUCCESS) {
+                throw new Error('Expected BRIDGE_SUCCESS');
+            }
+            const receipt = await call.awaitTransactionSuccessAsync({}, { shouldValidate: false });
+            // tslint:disable-next-line: no-unnecessary-type-assertion
+            return receipt.logs as DecodedLogs;
+        }
+
+        it('succeeds with no bridge calls and no input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: [],
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: ZERO_AMOUNT });
+        });
+
+        it('succeeds with bridge calls and no input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: allBridgeCalls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: ZERO_AMOUNT });
+        });
+
+        it('succeeds with no bridge calls and an input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: [],
+            });
+            await callBridgeTransferFromAsync({
+                bridgeData,
+                sellAmount: new BigNumber(1),
+            });
+        });
+
+        it('succeeds if entire input token balance is not consumed', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: allBridgeCalls,
+            });
+            await callBridgeTransferFromAsync({
+                bridgeData,
+                sellAmount: totalFillableInputAmount.plus(1),
+            });
+        });
+
+        it('fails if not authorized', async () => {
+            const calls = goodBridgeCalls.slice(0, 1);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callAndTransactAsync(testContract.setAuthorized(NULL_ADDRESS));
+            return expect(callBridgeTransferFromAsync({ bridgeData, sellAmount: new BigNumber(1) })).to.revertWith(
+                NOT_AUTHORIZED_REVERT,
+            );
+        });
+
+        it('succeeds with one bridge call', async () => {
+            const calls = goodBridgeCalls.slice(0, 1);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: calls[0].inputTokenAmount });
+        });
+
+        it('succeeds with many bridge calls', async () => {
+            const calls = goodBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+        });
+
+        it('swallows a failing bridge call', async () => {
+            const calls = _.shuffle([...goodBridgeCalls, failingBridgeCall]);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+        });
+
+        it('consumes input tokens for output tokens', async () => {
+            const calls = allBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+            const currentBridgeInputBalance = await testContract
+                .balanceOf(inputToken, testContract.address)
+                .callAsync();
+            expect(currentBridgeInputBalance).to.bignumber.eq(0);
+            const currentRecipientOutputBalance = await testContract
+                .balanceOf(outputToken, DEFAULTS.toAddress)
+                .callAsync();
+            expect(currentRecipientOutputBalance).to.bignumber.eq(totalFillableOutputAmount);
+        });
+
+        it("transfers only up to each call's input amount to each bridge", async () => {
+            const calls = goodBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            for (const [call, btf] of shortZip(goodBridgeCalls, btfs)) {
+                expect(btf.inputTokenBalance).to.bignumber.eq(call.inputTokenAmount);
+            }
+        });
+
+        it('transfers only up to outstanding sell amount to each bridge', async () => {
+            // Prepend an extra bridge call.
+            const calls = [
+                await createBridgeCallAsync({
+                    callFields: {
+                        inputTokenAmount: new BigNumber(1),
+                        outputTokenAmount: new BigNumber(1),
+                    },
+                }),
+                ...goodBridgeCalls,
+            ];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length + 1);
+            // The last call will receive 1 less token.
+            const lastCall = calls.slice(-1)[0];
+            const lastBtf = btfs.slice(-1)[0];
+            expect(lastBtf.inputTokenBalance).to.bignumber.eq(lastCall.inputTokenAmount.minus(1));
+        });
+
+        it('recoups funds from a bridge that fails', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // fail.
+            const badCall = await createBridgeCallAsync({
+                callFields: { inputTokenAmount: totalFillableInputAmount },
+                returnCode: BRIDGE_FAILURE,
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+
+        it('recoups funds from a bridge that reverts', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // revert.
+            const badCall = await createBridgeCallAsync({
+                callFields: { inputTokenAmount: totalFillableInputAmount },
+                revertError: BRIDGE_REVERT_ERROR,
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+
+        it('recoups funds from a bridge that under-pays', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // underpay the output amount..
+            const badCall = await createBridgeCallAsync({
+                callFields: {
+                    inputTokenAmount: totalFillableInputAmount,
+                    outputTokenAmount: new BigNumber(2),
+                },
+                outputFillAmount: new BigNumber(1),
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+    });
+
+    describe('executeBridgeCall()', () => {
+        it('cannot be called externally', async () => {
+            return expect(
+                testContract
+                    .executeBridgeCall(
+                        randomAddress(),
+                        randomAddress(),
+                        randomAddress(),
+                        randomAddress(),
+                        new BigNumber(1),
+                        new BigNumber(1),
+                        constants.NULL_BYTES,
+                    )
+                    .callAsync(),
+            ).to.revertWith('DexForwarderBridge/ONLY_SELF');
+        });
+    });
+});

contracts/asset-proxy/test/static_call_proxy.ts

@@ -168,7 +168,7 @@ describe('StaticCallProxy', () => {
         it('should revert if the hash of the output is different than expected expected', async () => {
             const staticCallData = staticCallTarget.isOddNumber(new BigNumber(0)).getABIEncodedTransactionData();
             const trueAsBuffer = ethUtil.toBuffer('0x0000000000000000000000000000000000000000000000000000000000000001');
-            const expectedResultHash = ethUtil.bufferToHex(ethUtil.keccak256(trueAsBuffer));
+            const expectedResultHash = ethUtil.bufferToHex(ethUtil.sha3(trueAsBuffer));
             const assetData = assetDataInterface
                 .StaticCall(staticCallTarget.address, staticCallData, expectedResultHash)
                 .getABIEncodedTransactionData();
@@ -199,7 +199,7 @@ describe('StaticCallProxy', () => {
         it('should be successful if a function call with one static input returns the correct value', async () => {
             const staticCallData = staticCallTarget.isOddNumber(new BigNumber(1)).getABIEncodedTransactionData();
             const trueAsBuffer = ethUtil.toBuffer('0x0000000000000000000000000000000000000000000000000000000000000001');
-            const expectedResultHash = ethUtil.bufferToHex(ethUtil.keccak256(trueAsBuffer));
+            const expectedResultHash = ethUtil.bufferToHex(ethUtil.sha3(trueAsBuffer));
             const assetData = assetDataInterface
                 .StaticCall(staticCallTarget.address, staticCallData, expectedResultHash)
                 .getABIEncodedTransactionData();
@@ -232,7 +232,7 @@ describe('StaticCallProxy', () => {
             const offset = '0000000000000000000000000000000000000000000000000000000000000020';
             const encodedExpectedResultWithOffset = `0x${offset}${abiEncoder.encode(expectedResults).slice(2)}`;
             const expectedResultHash = ethUtil.bufferToHex(
-                ethUtil.keccak256(ethUtil.toBuffer(encodedExpectedResultWithOffset)),
+                ethUtil.sha3(ethUtil.toBuffer(encodedExpectedResultWithOffset)),
             );
             const assetData = assetDataInterface
                 .StaticCall(staticCallTarget.address, staticCallData, expectedResultHash)

contracts/broker/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "1.1.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "1.1.27",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "1.1.26",
+        "timestamp": 1615932869,
+        "version": "1.1.26-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/broker/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v1.1.28 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v1.1.27 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v1.1.26 - _March 17, 2021_
+## v1.1.26-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/broker/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-broker",
-    "version": "1.1.28",
+    "version": "1.1.26-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,20 +51,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/contracts-exchange": "^3.2.29",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/contracts-exchange": "^3.2.27-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -81,14 +81,14 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/coordinator/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "3.1.29",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "3.1.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "3.1.27",
+        "timestamp": 1615932869,
+        "version": "3.1.27-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/coordinator/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v3.1.29 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v3.1.28 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v3.1.27 - _March 17, 2021_
+## v3.1.27-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/coordinator/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-coordinator",
-    "version": "3.1.29",
+    "version": "3.1.27-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,17 +52,17 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -79,20 +79,20 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.26",
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contracts-exchange": "^3.2.29",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/json-schemas": "^6.1.2",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0",
+        "@0x/assert": "^3.0.21",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contract-addresses": "^5.11.0",
+        "@0x/contracts-exchange": "^3.2.27-multiplex.0",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/json-schemas": "^5.4.1",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0",
         "http-status-codes": "^1.3.2"
     },
     "publishConfig": {

contracts/coordinator/src/client/utils/assert.ts

@@ -1,4 +1,8 @@
 import { assert as sharedAssert } from '@0x/assert';
+// HACK: We need those two unused imports because they're actually used by sharedAssert which gets injected here
+import { Schema } from '@0x/json-schemas'; // tslint:disable-line:no-unused-variable
+import { Order } from '@0x/types'; // tslint:disable-line:no-unused-variable
+import { BigNumber } from '@0x/utils'; // tslint:disable-line:no-unused-variable
 import { Web3Wrapper } from '@0x/web3-wrapper';
 
 export const assert = {

contracts/dev-utils/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "1.3.27",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "1.3.26",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "1.3.25",
+        "timestamp": 1615932869,
+        "version": "1.3.25-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/dev-utils/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v1.3.27 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v1.3.26 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v1.3.25 - _March 17, 2021_
+## v1.3.25-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/dev-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-dev-utils",
-    "version": "1.3.27",
+    "version": "1.3.25-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -41,18 +41,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/dev-utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/assert": "^3.0.26",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/assert": "^3.0.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0",
         "ethers": "~4.0.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -60,10 +60,10 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
+        "@0x/base-contract": "^6.2.18",
         "@types/node": "12.12.54"
     },
     "publishConfig": {

contracts/erc1155/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "2.1.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "2.1.27",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "2.1.26",
+        "timestamp": 1615932869,
+        "version": "2.1.26-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/erc1155/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v2.1.28 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v2.1.27 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v2.1.26 - _March 17, 2021_
+## v2.1.26-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/erc1155/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc1155",
-    "version": "2.1.28",
+    "version": "2.1.26-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -68,7 +68,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
+        "ethereum-types": "^3.4.0",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -77,13 +77,13 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/erc20/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "3.3.7",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "3.3.6",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "3.3.5",
+        "timestamp": 1615932869,
+        "version": "3.3.5-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/erc20/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v3.3.7 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v3.3.6 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v3.3.5 - _March 17, 2021_
+## v3.3.5-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/erc20/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20",
-    "version": "3.3.7",
+    "version": "3.3.5-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,18 +51,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -70,7 +70,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -79,10 +79,10 @@
         "solhint": "^1.4.1",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2"
+        "@0x/base-contract": "^6.2.18"
     },
     "publishConfig": {
         "access": "public"

contracts/erc20/test/weth9.ts

@@ -39,8 +39,8 @@ describe('EtherToken', () => {
             artifacts.WETH9,
             provider,
             {
-                ...txDefaults,
                 gasPrice,
+                ...txDefaults,
             },
             artifacts,
         );

contracts/erc721/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "3.1.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "3.1.27",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "3.1.26",
+        "timestamp": 1615932869,
+        "version": "3.1.26-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/erc721/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v3.1.28 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v3.1.27 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v3.1.26 - _March 17, 2021_
+## v3.1.26-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/erc721/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc721",
-    "version": "3.1.28",
+    "version": "3.1.26-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,18 +52,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -71,7 +71,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -81,10 +81,10 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2"
+        "@0x/base-contract": "^6.2.18"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-forwarder/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "4.2.29",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "4.2.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "4.2.27",
+        "timestamp": 1615932869,
+        "version": "4.2.27-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/exchange-forwarder/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v4.2.29 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v4.2.28 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v4.2.27 - _March 17, 2021_
+## v4.2.27-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/exchange-forwarder/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-forwarder",
-    "version": "4.2.29",
+    "version": "4.2.27-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,25 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-erc1155": "^2.1.28",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/contracts-exchange": "^3.2.29",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-erc1155": "^2.1.26-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/contracts-exchange": "^3.2.27-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -87,12 +87,12 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/typescript-typings": "^5.2.0",
-        "ethereum-types": "^3.5.0"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-libs/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "4.3.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "4.3.27",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "4.3.26",
+        "timestamp": 1615932869,
+        "version": "4.3.26-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/exchange-libs/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v4.3.28 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v4.3.27 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v4.3.26 - _March 17, 2021_
+## v4.3.26-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/exchange-libs/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-libs",
-    "version": "4.3.28",
+    "version": "4.3.26-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,14 +52,14 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/libs",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
-        "@0x/subproviders": "^6.5.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
+        "@0x/subproviders": "^6.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -67,7 +67,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereumjs-util": "^7.0.10",
+        "ethereumjs-util": "^5.1.1",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -77,17 +77,17 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "3.2.29",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "3.2.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "3.2.27",
+        "timestamp": 1615932869,
+        "version": "3.2.27-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/exchange/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v3.2.29 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v3.2.28 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v3.2.27 - _March 17, 2021_
+## v3.2.27-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/exchange/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange",
-    "version": "3.2.29",
+    "version": "3.2.27-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,21 +52,21 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-multisig": "^4.1.29",
-        "@0x/contracts-staking": "^2.0.36",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-multisig": "^4.1.27-multiplex.0",
+        "@0x/contracts-staking": "^2.0.34-multiplex.0",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -74,8 +74,8 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
-        "ethereumjs-util": "^7.0.10",
+        "ethereum-types": "^3.4.0",
+        "ethereumjs-util": "^5.1.1",
         "js-combinatorics": "^0.5.3",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -85,16 +85,16 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-erc1155": "^2.1.28",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/utils": "^6.4.2",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-erc1155": "^2.1.26-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/utils": "^6.2.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/exchange/test/signature_validator.ts

@@ -86,7 +86,7 @@ blockchainTests.resets('MixinSignatureValidator', env => {
 
     const SIGNATURE_LENGTH = 65;
     const generateRandomSignature = (): string => hexUtils.random(SIGNATURE_LENGTH);
-    const hashBytes = (bytesHex: string): string => hexUtils.hash(bytesHex);
+    const hashBytes = (bytesHex: string): string => ethUtil.bufferToHex(ethUtil.sha3(ethUtil.toBuffer(bytesHex)));
     const signDataHex = (dataHex: string, privateKey: Buffer): string => {
         const ecSignature = ethUtil.ecsign(ethUtil.toBuffer(dataHex), privateKey);
         return hexUtils.concat(ecSignature.v, ecSignature.r, ecSignature.s);

contracts/exchange/test/utils/abstract/abstract_balance_and_proxy_allowance_fetcher.ts

@@ -12,12 +12,12 @@ export abstract class AbstractBalanceAndProxyAllowanceFetcher {
      * @param userAddress Ethereum address for which to fetch the balance
      * @return Balance amount in base units
      */
-    public abstract getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
+    public abstract async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
     /**
      * Get the 0x asset proxy allowance of assetData for userAddress
      * @param assetData AssetData for which to fetch the allowance
      * @param userAddress Ethereum address for which to fetch the allowance
      * @return Allowance amount in base units
      */
-    public abstract getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
+    public abstract async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
 }

contracts/exchange/test/utils/abstract/abstract_balance_and_proxy_allowance_lazy_store.ts

@@ -1,8 +1,8 @@
 import { BigNumber } from '@0x/utils';
 
 export abstract class AbstractBalanceAndProxyAllowanceLazyStore {
-    public abstract getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
-    public abstract getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
+    public abstract async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
+    public abstract async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
     public abstract setBalance(assetData: string, userAddress: string, balance: BigNumber): void;
     public abstract deleteBalance(assetData: string, userAddress: string): void;
     public abstract setProxyAllowance(assetData: string, userAddress: string, proxyAllowance: BigNumber): void;

contracts/exchange/test/utils/abstract/abstract_order_filled_cancelled_fetcher.ts

@@ -11,5 +11,5 @@ export abstract class AbstractOrderFilledCancelledFetcher {
      * @param orderHash OrderHash of order we are interested in
      * @return FilledTakerAmount
      */
-    public abstract getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber>;
+    public abstract async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber>;
 }

contracts/exchange/test/utils/abstract/abstract_order_filled_cancelled_lazy_store.ts

@@ -1,7 +1,7 @@
 import { BigNumber } from '@0x/utils';
 
 export abstract class AbstractOrderFilledCancelledLazyStore {
-    public abstract getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber>;
+    public abstract async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber>;
     public abstract setFilledTakerAmount(orderHash: string, balance: BigNumber): void;
     public abstract deleteFilledTakerAmount(orderHash: string): void;
     public abstract setIsCancelled(orderHash: string, isCancelled: boolean): void;

contracts/exchange/test/utils/isolated_exchange_wrapper.ts

@@ -18,7 +18,6 @@ import {
     IsolatedExchangeFillEventArgs as FillEventArgs,
 } from '../wrappers';
 
-export { Order } from '@0x/types';
 export interface AssetBalances {
     [assetData: string]: { [address: string]: BigNumber };
 }
@@ -28,6 +27,7 @@ export interface IsolatedExchangeEvents {
     transferFromCalls: DispatchTransferFromCallArgs[];
 }
 
+export type Order = Order;
 export type Numberish = string | number | BigNumber;
 
 export const DEFAULT_GOOD_SIGNATURE = createGoodSignature();

contracts/exchange/test/wrapper_unit_tests.ts

@@ -12,6 +12,7 @@ import { ReferenceFunctions as UtilReferenceFunctions, SafeMathRevertErrors } fr
 import { FillResults, Order } from '@0x/types';
 import { AnyRevertError, BigNumber, ExchangeRevertErrors, hexUtils, StringRevertError } from '@0x/utils';
 import { LogEntry, LogWithDecodedArgs } from 'ethereum-types';
+import * as ethjs from 'ethereumjs-util';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
@@ -103,7 +104,7 @@ blockchainTests('Exchange wrapper functions unit tests.', env => {
     // Creates a deterministic order signature, even though no signature validation
     // actually occurs in the test contract.
     function createOrderSignature(order: Order): string {
-        return hexUtils.hash(orderHashUtils.getOrderHashHex(order));
+        return ethjs.bufferToHex(ethjs.sha3(ethjs.toBuffer(orderHashUtils.getOrderHashHex(order))));
     }
 
     // Asserts that `_fillOrder()` was called in the same order and with the same

contracts/extensions/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "6.2.23",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "6.2.22",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "6.2.21",
+        "timestamp": 1615932869,
+        "version": "6.2.21-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/extensions/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v6.2.23 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v6.2.22 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v6.2.21 - _March 17, 2021_
+## v6.2.21-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/extensions/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-extensions",
-    "version": "6.2.23",
+    "version": "6.2.21-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,23 +52,23 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/contracts-exchange": "^3.2.29",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/contracts-exchange": "^3.2.27-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -77,7 +77,7 @@
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
         "ethereumjs-abi": "0.6.5",
-        "ethereumjs-util": "^7.0.10",
+        "ethereumjs-util": "^5.1.1",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -87,13 +87,13 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/typescript-typings": "^5.2.0",
-        "ethereum-types": "^3.5.0"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/integrations/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-integrations",
-    "version": "2.7.37",
+    "version": "2.7.29-multiplex.0",
     "private": true,
     "engines": {
         "node": ">=6.12"
@@ -52,25 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contract-wrappers": "^13.16.0",
-        "@0x/contracts-broker": "^1.1.28",
-        "@0x/contracts-coordinator": "^3.1.29",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-exchange-forwarder": "^4.2.29",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-extensions": "^6.2.23",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-utils": "^4.7.7",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contract-addresses": "^5.11.0",
+        "@0x/contract-wrappers": "^13.14.0-multiplex",
+        "@0x/contracts-broker": "^1.1.26-multiplex.0",
+        "@0x/contracts-coordinator": "^3.1.27-multiplex.0",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-exchange-forwarder": "^4.2.27-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-extensions": "^6.2.21-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
         "@0x/coordinator-server": "^1.0.5",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/migrations": "^8.0.3",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/protocol-utils": "^1.5.1",
-        "@0x/sol-compiler": "^4.7.2",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/migrations": "^7.0.1-multiplex.0",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/protocol-utils": "^1.3.1-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/web3-wrapper": "^7.4.1",
         "@azure/core-asynciterator-polyfill": "^1.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -90,26 +90,26 @@
         "solhint": "^1.4.1",
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/asset-swapper": "^6.8.0",
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-erc1155": "^2.1.28",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-erc721": "^3.1.28",
-        "@0x/contracts-exchange": "^3.2.29",
-        "@0x/contracts-multisig": "^4.1.29",
-        "@0x/contracts-staking": "^2.0.36",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-zero-ex": "^0.22.1",
-        "@0x/subproviders": "^6.5.2",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0",
-        "ethereumjs-util": "^7.0.10",
+        "@0x/asset-swapper": "^6.3.0-multiplex",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-erc1155": "^2.1.26-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-erc721": "^3.1.26-multiplex.0",
+        "@0x/contracts-exchange": "^3.2.27-multiplex.0",
+        "@0x/contracts-multisig": "^4.1.27-multiplex.0",
+        "@0x/contracts-staking": "^2.0.34-multiplex.0",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-zero-ex": "^0.20.0-multiplex",
+        "@0x/subproviders": "^6.4.1",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0",
+        "ethereumjs-util": "^6.2.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/integrations/test/dev-utils/dydx_order_validation_test.ts

@@ -63,9 +63,11 @@ blockchainTests.fork('DevUtils dydx order validation tests', env => {
     let dai: ERC20TokenContract;
     let usdc: ERC20TokenContract;
     let devUtils: DevUtilsContract;
+    let accountOwner: string;
     let minMarginRatio: number;
 
     before(async () => {
+        [accountOwner] = await env.getAccountAddressesAsync();
         dydx = new IDydxContract(DYDX_ADDRESS, env.provider, env.txDefaults);
         dai = new ERC20TokenContract(DAI_ADDRESS, env.provider, env.txDefaults);
         usdc = new ERC20TokenContract(USDC_ADDRESS, env.provider, env.txDefaults);

contracts/integrations/test/framework/actors/utils.ts

@@ -19,5 +19,5 @@ export function filterActorsByRole<TClass extends Constructor>(
     actors: Actor[],
     role: TClass,
 ): Array<InstanceType<typeof role>> {
-    return actors.filter(actor => actor.mixins.includes(role.name)) as Array<InstanceType<typeof role>>;
+    return actors.filter(actor => actor.mixins.includes(role.name)) as InstanceType<typeof role>;
 }

contracts/multisig/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "4.1.29",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "4.1.28",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "4.1.27",
+        "timestamp": 1615932869,
+        "version": "4.1.27-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/multisig/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v4.1.29 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v4.1.28 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v4.1.27 - _March 17, 2021_
+## v4.1.27-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/multisig/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-multisig",
-    "version": "4.1.29",
+    "version": "4.1.27-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -49,18 +49,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/multisig",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/sol-compiler": "^4.7.2",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/sol-compiler": "^4.6.1",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -75,12 +75,12 @@
         "shx": "^0.2.2",
         "solhint": "^1.4.1",
         "tslint": "5.11.0",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/typescript-typings": "^5.2.0",
-        "ethereum-types": "^3.5.0"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/staking/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "2.0.36",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "2.0.35",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "2.0.34",
+        "timestamp": 1615932869,
+        "version": "2.0.34-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/staking/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v2.0.36 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v2.0.35 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v2.0.34 - _March 17, 2021_
+## v2.0.34-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/staking/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-staking",
-    "version": "2.0.36",
+    "version": "2.0.34-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -53,20 +53,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-dev-utils": "^1.3.27",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-exchange-libs": "^4.3.28",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-utils": "^4.7.7",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-dev-utils": "^1.3.25-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-exchange-libs": "^4.3.26-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-utils": "^4.7.5-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/lodash": "4.14.104",
         "@types/node": "12.12.54",
         "chai": "^4.0.1",
@@ -84,15 +84,15 @@
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "ethereum-types": "^3.5.0",
-        "ethereumjs-util": "^7.0.10"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "ethereum-types": "^3.4.0",
+        "ethereumjs-util": "^5.1.1"
     },
     "publishConfig": {
         "access": "public"

contracts/staking/src/types.ts

@@ -4,7 +4,6 @@ import { DecodedLogArgs, LogWithDecodedArgs } from 'ethereum-types';
 
 import { constants as stakingConstants } from './constants';
 
-export { Numberish } from '@0x/contracts-test-utils';
 // tslint:disable:max-classes-per-file
 
 export interface StakingParams {
@@ -260,3 +259,5 @@ export class AggregatedStats {
 export interface AggregatedStatsByEpoch {
     [epoch: string]: AggregatedStats;
 }
+
+export type Numberish = Numberish;

contracts/staking/test/unit_tests/exchange_test.ts

@@ -12,6 +12,7 @@ import {
 
 blockchainTests.resets('Exchange Unit Tests', env => {
     // Addresses
+    let nonOwner: string;
     let owner: string;
     let nonExchange: string;
     let exchange: string;
@@ -23,7 +24,7 @@ blockchainTests.resets('Exchange Unit Tests', env => {
 
     before(async () => {
         // Set up addresses for testing.
-        [, owner, nonExchange, exchange, nonAuthority, authority] = await env.getAccountAddressesAsync();
+        [nonOwner, owner, nonExchange, exchange, nonAuthority, authority] = await env.getAccountAddressesAsync();
 
         // Deploy the Exchange Manager contract.
         exchangeManager = await TestExchangeManagerContract.deployFrom0xArtifactAsync(

contracts/staking/test/unit_tests/finalizer_test.ts

@@ -543,7 +543,7 @@ blockchainTests.resets('Finalizer unit tests', env => {
             const expectedPoolRewards = await calculatePoolRewardsAsync(INITIAL_BALANCE, pools);
             const [pool, reward] = _.sampleSize(shortZip(pools, expectedPoolRewards), 1)[0];
             return assertUnfinalizedPoolRewardsAsync(pool.poolId, {
-                totalReward: reward,
+                totalReward: (reward as any) as BigNumber,
                 membersStake: pool.membersStake,
             });
         });

contracts/staking/test/unit_tests/lib_cobb_douglas_test.ts

@@ -12,13 +12,17 @@ import * as _ from 'lodash';
 import { artifacts } from '../artifacts';
 import { TestCobbDouglasContract } from '../wrappers';
 
+// tslint:disable: no-unnecessary-type-assertion
 blockchainTests('LibCobbDouglas unit tests', env => {
     const FUZZ_COUNT = 1024;
     const PRECISION = 15;
 
     let testContract: TestCobbDouglasContract;
+    let ownerAddress: string;
+    let notOwnerAddress: string;
 
     before(async () => {
+        [ownerAddress, notOwnerAddress] = await env.getAccountAddressesAsync();
         testContract = await TestCobbDouglasContract.deployFrom0xArtifactAsync(
             artifacts.TestCobbDouglas,
             env.provider,
@@ -207,3 +211,4 @@ blockchainTests('LibCobbDouglas unit tests', env => {
         });
     });
 });
+// tslint:enable:no-unnecessary-type-assertion

contracts/test-utils/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "5.3.25",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "5.3.24",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "5.3.23",
+        "timestamp": 1615932869,
+        "version": "5.3.23-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/test-utils/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v5.3.25 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v5.3.24 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v5.3.23 - _March 17, 2021_
+## v5.3.23-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/test-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-test-utils",
-    "version": "5.3.25",
+    "version": "5.3.23-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -34,28 +34,28 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/test-utils",
     "devDependencies": {
-        "@0x/sol-compiler": "^4.7.2",
-        "@0x/tslint-config": "^4.1.4",
+        "@0x/sol-compiler": "^4.6.1",
+        "@0x/tslint-config": "^4.1.3",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
         "tslint": "5.11.0",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.26",
-        "@0x/base-contract": "^6.3.2",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/json-schemas": "^6.1.2",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-coverage": "^4.0.36",
-        "@0x/sol-profiler": "^4.1.26",
-        "@0x/sol-trace": "^3.0.36",
-        "@0x/subproviders": "^6.5.2",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/assert": "^3.0.21",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/contract-addresses": "^5.11.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/json-schemas": "^5.4.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-coverage": "^4.0.31",
+        "@0x/sol-profiler": "^4.1.21",
+        "@0x/sol-trace": "^3.0.31",
+        "@0x/subproviders": "^6.4.1",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/bn.js": "^4.11.0",
         "@types/js-combinatorics": "^0.5.29",
         "@types/lodash": "4.14.104",
@@ -67,8 +67,8 @@
         "chai-bignumber": "^3.0.0",
         "decimal.js": "^10.2.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.5.0",
-        "ethereumjs-util": "^7.0.10",
+        "ethereum-types": "^3.4.0",
+        "ethereumjs-util": "^5.1.1",
         "ethers": "~4.0.4",
         "js-combinatorics": "^0.5.3",
         "lodash": "^4.17.11",

contracts/test-utils/src/constants.ts

@@ -77,7 +77,7 @@ export const constants = {
     ZERO_AMOUNT: new BigNumber(0),
     PERCENTAGE_DENOMINATOR: new BigNumber(10).pow(18),
     TIME_BUFFER: new BigNumber(1000),
-    KECCAK256_NULL: ethUtil.bufferToHex(ethUtil.keccak256(Buffer.alloc(0))),
+    KECCAK256_NULL: ethUtil.addHexPrefix(ethUtil.bufferToHex(ethUtil.SHA3_NULL)),
     MAX_UINT256_ROOT: new BigNumber('340282366920938463463374607431768211456'),
     ONE_ETHER: new BigNumber(1e18),
     EIP712_DOMAIN_NAME: '0x Protocol',

contracts/test-utils/src/lang_utils.ts

@@ -14,6 +14,6 @@ export function shortZip<T1, T2>(a: T1[], b: T2[]): Array<[T1, T2]> {
 export function replaceKeysDeep(obj: {}, mapKeys: (key: string) => string | void): _.Dictionary<{}> {
     return _.transform(obj, (result, value, key) => {
         const currentKey = mapKeys(key) || key;
-        result[currentKey] = _.isObject(value) ? replaceKeysDeep(value as {}, mapKeys) : (value as {});
+        result[currentKey] = _.isObject(value) ? replaceKeysDeep(value, mapKeys) : value;
     });
 }

contracts/test-utils/src/order_factory.ts

@@ -22,14 +22,14 @@ export class OrderFactory {
     ): Promise<SignedOrder> {
         const fifteenMinutesInSeconds = 15 * 60;
         const currentBlockTimestamp = await getLatestBlockTimestampAsync();
-        const order = {
+        const order = ({
             takerAddress: constants.NULL_ADDRESS,
             senderAddress: constants.NULL_ADDRESS,
             expirationTimeSeconds: new BigNumber(currentBlockTimestamp).plus(fifteenMinutesInSeconds),
             salt: generatePseudoRandomSalt(),
             ...this._defaultOrderParams,
             ...customOrderParams,
-        } as Order; // tslint:disable-line:no-object-literal-type-assertion
+        } as any) as Order;
         const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
         const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
         const signedOrder = {

contracts/test-utils/src/order_utils.ts

@@ -30,8 +30,7 @@ export const orderUtils = {
         return cancel;
     },
     createOrderWithoutSignature(signedOrder: SignedOrder): Order {
-        const { signature, ...order } = signedOrder;
-        return order;
+        return _.omit(signedOrder, ['signature']) as Order;
     },
     createBatchMatchOrders(signedOrdersLeft: SignedOrder[], signedOrdersRight: SignedOrder[]): BatchMatchOrder {
         return {

contracts/test-utils/test/order_hash_test.ts

@@ -57,7 +57,9 @@ describe('Order hashing', () => {
                 ...order,
                 takerAddress: (null as any) as string,
             };
-            const expectedErrorMessage = `Expected order to conform to schema`;
+            const expectedErrorMessage = `Order taker must be of type string. If you want anyone to be able to fill an order - pass ${
+                constants.NULL_ADDRESS
+            }`;
             expect(() => orderHashUtils.getOrderHashHex(orderWithInvalidtakerFormat)).to.throw(expectedErrorMessage);
         });
     });

contracts/treasury/CHANGELOG.json

@@ -1,49 +1,13 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "1.1.4",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1619481586,
-        "version": "1.1.3",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1618259868,
-        "version": "1.1.2",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "1.1.1",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "version": "1.1.0",
+        "version": "1.1.0-multiplex",
         "changes": [
             {
                 "note": "Make the proposal/quorum thresholds updatable",
                 "pr": 165
             }
         ],
-        "timestamp": 1616005394
+        "timestamp": 1615932869
     },
     {
         "timestamp": 1614141718,

contracts/treasury/CHANGELOG.md

@@ -5,23 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v1.1.4 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v1.1.3 - _April 26, 2021_
-
-    * Dependencies updated
-
-## v1.1.2 - _April 12, 2021_
-
-    * Dependencies updated
-
-## v1.1.1 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v1.1.0 - _March 17, 2021_
+## v1.1.0-multiplex - _March 16, 2021_
 
     * Make the proposal/quorum thresholds updatable (#165)
 

contracts/treasury/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-treasury",
-    "version": "1.1.4",
+    "version": "1.1.0-multiplex",
     "engines": {
         "node": ">=6.12"
     },
@@ -46,16 +46,16 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/treasury",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contracts-asset-proxy": "^3.7.10",
-        "@0x/contracts-erc20": "^3.3.7",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-staking": "^2.0.36",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/sol-compiler": "^4.7.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contract-addresses": "^5.11.0",
+        "@0x/contracts-asset-proxy": "^3.7.8-multiplex.0",
+        "@0x/contracts-erc20": "^3.3.5-multiplex.0",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-staking": "^2.0.34-multiplex.0",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.4",
+        "@0x/tslint-config": "^4.1.3",
         "@types/isomorphic-fetch": "^0.0.35",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -69,18 +69,18 @@
         "solhint": "^1.4.1",
         "tslint": "5.11.0",
         "typedoc": "~0.16.11",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/protocol-utils": "^1.5.1",
-        "@0x/subproviders": "^6.5.2",
-        "@0x/types": "^3.3.3",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
-        "@0x/web3-wrapper": "^7.5.2",
-        "ethereum-types": "^3.5.0",
-        "ethereumjs-util": "^7.0.10"
+        "@0x/base-contract": "^6.2.18",
+        "@0x/protocol-utils": "^1.3.1-multiplex.0",
+        "@0x/subproviders": "^6.4.1",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
+        "@0x/web3-wrapper": "^7.4.1",
+        "ethereum-types": "^3.4.0",
+        "ethereumjs-util": "^5.1.1"
     },
     "publishConfig": {
         "access": "public"

contracts/utils/CHANGELOG.json

@@ -1,25 +1,7 @@
 [
     {
-        "timestamp": 1619596077,
-        "version": "4.7.7",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1617311315,
-        "version": "4.7.6",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1616005394,
-        "version": "4.7.5",
+        "timestamp": 1615932869,
+        "version": "4.7.5-multiplex.0",
         "changes": [
             {
                 "note": "Dependencies updated"

contracts/utils/CHANGELOG.md

@@ -5,15 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v4.7.7 - _April 28, 2021_
-
-    * Dependencies updated
-
-## v4.7.6 - _April 1, 2021_
-
-    * Dependencies updated
-
-## v4.7.5 - _March 17, 2021_
+## v4.7.5-multiplex.0 - _March 16, 2021_
 
     * Dependencies updated
 

contracts/utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-utils",
-    "version": "4.7.7",
+    "version": "4.7.5-multiplex.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -50,15 +50,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.5.2",
-        "@0x/contracts-gen": "^2.0.37",
-        "@0x/contracts-test-utils": "^5.3.25",
-        "@0x/dev-utils": "^4.2.6",
-        "@0x/order-utils": "^10.4.20",
-        "@0x/sol-compiler": "^4.7.2",
-        "@0x/tslint-config": "^4.1.4",
-        "@0x/types": "^3.3.3",
-        "@0x/web3-wrapper": "^7.5.2",
+        "@0x/abi-gen": "^5.4.21",
+        "@0x/contracts-gen": "^2.0.32",
+        "@0x/contracts-test-utils": "^5.3.23-multiplex.0",
+        "@0x/dev-utils": "^4.2.1",
+        "@0x/order-utils": "^10.4.18-multiplex.0",
+        "@0x/sol-compiler": "^4.6.1",
+        "@0x/tslint-config": "^4.1.3",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.4.1",
         "@types/bn.js": "^4.11.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -67,7 +67,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereumjs-util": "^7.0.10",
+        "ethereumjs-util": "^5.1.1",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -76,14 +76,14 @@
         "solhint": "^1.4.1",
         "truffle": "^5.0.32",
         "tslint": "5.11.0",
-        "typescript": "4.2.2"
+        "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.3.2",
-        "@0x/typescript-typings": "^5.2.0",
-        "@0x/utils": "^6.4.2",
+        "@0x/base-contract": "^6.2.18",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.2.0",
         "bn.js": "^4.11.8",
-        "ethereum-types": "^3.5.0"
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/utils/test/lib_eip712.ts

@@ -2,6 +2,7 @@ import { chaiSetup, constants, provider, txDefaults, web3Wrapper } from '@0x/con
 import { BlockchainLifecycle } from '@0x/dev-utils';
 import { BigNumber, hexUtils, signTypedDataUtils } from '@0x/utils';
 import * as chai from 'chai';
+import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
@@ -77,7 +78,7 @@ describe('LibEIP712', () => {
 
         // Hash the provided input to get the expected hash
         const input = '0x1901'.concat(unprefixedDomainHash.concat(unprefixedHashStruct));
-        const expectedHash = hexUtils.hash(input);
+        const expectedHash = '0x'.concat(ethUtil.sha3(input).toString('hex'));
 
         // Get the actual hash by calling the smart contract
         const actualHash = await lib.externalHashEIP712Message(domainHash, hashStruct).callAsync();

contracts/zero-ex/CHANGELOG.json

@@ -1,65 +1,6 @@
 [
     {
-        "version": "0.22.1",
-        "changes": [
-            {
-                "note": "bump feature version to 1.2",
-                "pr": 213
-            }
-        ],
-        "timestamp": 1619596077
-    },
-    {
-        "version": "0.22.0",
-        "changes": [
-            {
-                "note": "Add order signer registry to NativeOrdersFeature",
-                "pr": 195
-            }
-        ],
-        "timestamp": 1619481586
-    },
-    {
-        "timestamp": 1618259868,
-        "version": "0.21.1",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "version": "0.21.0",
-        "changes": [
-            {
-                "note": "Encoding protocol ID and source name in bridge source ID",
-                "pr": 162
-            },
-            {
-                "note": "Add PancakeSwapFeature",
-                "pr": 164
-            },
-            {
-                "note": "Remove TokenSpender/AllowanceTarget/greedy tokens stuff",
-                "pr": 164
-            },
-            {
-                "note": "Added Nerve in BridgeAdapter",
-                "pr": 181
-            },
-            {
-                "note": "Delete TokenSpenderFeature",
-                "pr": 189
-            },
-            {
-                "note": "Fix PancakeSwapFeature BakerySwap swap selector",
-                "pr": 190
-            }
-        ],
-        "timestamp": 1617311315
-    },
-    {
-        "version": "0.20.0",
+        "version": "0.20.0-multiplex",
         "changes": [
             {
                 "note": "Add `MooniswapLiquidityProvider`",
@@ -78,7 +19,7 @@
                 "pr": 168
             }
         ],
-        "timestamp": 1616005394
+        "timestamp": 1615932869
     },
     {
         "version": "0.19.0",

contracts/zero-ex/CHANGELOG.md

@@ -5,28 +5,7 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v0.22.1 - _April 28, 2021_
-
-    * bump feature version to 1.2 (#213)
-
-## v0.22.0 - _April 26, 2021_
-
-    * Add order signer registry to NativeOrdersFeature (#195)
-
-## v0.21.1 - _April 12, 2021_
-
-    * Dependencies updated
-
-## v0.21.0 - _April 1, 2021_
-
-    * Encoding protocol ID and source name in bridge source ID (#162)
-    * Add PancakeSwapFeature (#164)
-    * Remove TokenSpender/AllowanceTarget/greedy tokens stuff (#164)
-    * Added Nerve in BridgeAdapter (#181)
-    * Delete TokenSpenderFeature (#189)
-    * Fix PancakeSwapFeature BakerySwap swap selector (#190)
-
-## v0.20.0 - _March 17, 2021_
+## v0.20.0-multiplex - _March 16, 2021_
 
     * Add `MooniswapLiquidityProvider` (#143)
     * Emit `LiquidityProviderFill` event in `CurveLiquidityProvider` (#143)

contracts/zero-ex/contracts/src/IZeroEx.sol

@@ -26,7 +26,6 @@ import "./features/interfaces/ITokenSpenderFeature.sol";
 import "./features/interfaces/ITransformERC20Feature.sol";
 import "./features/interfaces/IMetaTransactionsFeature.sol";
 import "./features/interfaces/IUniswapFeature.sol";
-import "./features/interfaces/IPancakeSwapFeature.sol";
 import "./features/interfaces/ILiquidityProviderFeature.sol";
 import "./features/interfaces/INativeOrdersFeature.sol";
 import "./features/interfaces/IBatchFillNativeOrdersFeature.sol";
@@ -37,10 +36,10 @@ import "./features/interfaces/IMultiplexFeature.sol";
 interface IZeroEx is
     IOwnableFeature,
     ISimpleFunctionRegistryFeature,
+    ITokenSpenderFeature,
     ITransformERC20Feature,
     IMetaTransactionsFeature,
     IUniswapFeature,
-    IPancakeSwapFeature,
     ILiquidityProviderFeature,
     INativeOrdersFeature,
     IBatchFillNativeOrdersFeature,

contracts/zero-ex/contracts/src/errors/LibNativeOrdersRichErrors.sol

@@ -88,21 +88,6 @@ library LibNativeOrdersRichErrors {
         );
     }
 
-    function InvalidSignerError(
-        address maker,
-        address signer
-    )
-        internal
-        pure
-        returns (bytes memory)
-    {
-        return abi.encodeWithSelector(
-            bytes4(keccak256("InvalidSignerError(address,address)")),
-            maker,
-            signer
-        );
-    }
-
     function OrderNotFillableBySenderError(
         bytes32 orderHash,
         address sender,

contracts/zero-ex/contracts/src/errors/LibSpenderRichErrors.sol

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+
+
+library LibSpenderRichErrors {
+
+    // solhint-disable func-name-mixedcase
+
+    function SpenderERC20TransferFromFailedError(
+        address token,
+        address owner,
+        address to,
+        uint256 amount,
+        bytes memory errorData
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("SpenderERC20TransferFromFailedError(address,address,address,uint256,bytes)")),
+            token,
+            owner,
+            to,
+            amount,
+            errorData
+        );
+    }
+}

contracts/zero-ex/contracts/src/external/AllowanceTarget.sol

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
+import "@0x/contracts-utils/contracts/src/v06/AuthorizableV06.sol";
+import "../errors/LibSpenderRichErrors.sol";
+import "./IAllowanceTarget.sol";
+
+
+/// @dev The allowance target for the TokenSpender feature.
+contract AllowanceTarget is
+    IAllowanceTarget,
+    AuthorizableV06
+{
+    // solhint-disable no-unused-vars,indent,no-empty-blocks
+    using LibRichErrorsV06 for bytes;
+
+    /// @dev Execute an arbitrary call. Only an authority can call this.
+    /// @param target The call target.
+    /// @param callData The call data.
+    /// @return resultData The data returned by the call.
+    function executeCall(
+        address payable target,
+        bytes calldata callData
+    )
+        external
+        override
+        onlyAuthorized
+        returns (bytes memory resultData)
+    {
+        bool success;
+        (success, resultData) = target.call(callData);
+        if (!success) {
+            resultData.rrevert();
+        }
+    }
+}

contracts/zero-ex/contracts/src/external/IAllowanceTarget.sol

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-utils/contracts/src/v06/interfaces/IAuthorizableV06.sol";
+
+
+/// @dev The allowance target for the TokenSpender feature.
+interface IAllowanceTarget is
+    IAuthorizableV06
+{
+    /// @dev Execute an arbitrary call. Only an authority can call this.
+    /// @param target The call target.
+    /// @param callData The call data.
+    /// @return resultData The data returned by the call.
+    function executeCall(
+        address payable target,
+        bytes calldata callData
+    )
+        external
+        returns (bytes memory resultData);
+}

contracts/zero-ex/contracts/src/features/LiquidityProviderFeature.sol

@@ -47,14 +47,15 @@ contract LiquidityProviderFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "LiquidityProviderFeature";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 4);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 3);
 
     /// @dev The sandbox contract address.
     ILiquidityProviderSandbox public immutable sandbox;
 
-    constructor(LiquidityProviderSandbox sandbox_)
+    constructor(LiquidityProviderSandbox sandbox_, bytes32 greedyTokensBloomFilter)
         public
         FixinCommon()
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
         sandbox = sandbox_;
     }

contracts/zero-ex/contracts/src/features/MetaTransactionsFeature.sol

@@ -78,7 +78,7 @@ contract MetaTransactionsFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "MetaTransactions";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 1);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 0);
     /// @dev EIP712 typehash of the `MetaTransactionData` struct.
     bytes32 public immutable MTX_EIP712_TYPEHASH = keccak256(
         "MetaTransactionData("
@@ -105,10 +105,11 @@ contract MetaTransactionsFeature is
         }
     }
 
-    constructor(address zeroExAddress)
+    constructor(address zeroExAddress, bytes32 greedyTokensBloomFilter)
         public
         FixinCommon()
         FixinEIP712(zeroExAddress)
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
         // solhint-disable-next-line no-empty-blocks
     }

contracts/zero-ex/contracts/src/features/MultiplexFeature.sol

@@ -55,7 +55,7 @@ contract MultiplexFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "MultiplexFeature";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 1);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 0);
 
     /// @dev The WETH token contract.
     IEtherTokenV06 private immutable weth;
@@ -73,10 +73,12 @@ contract MultiplexFeature is
     constructor(
         address zeroExAddress,
         IEtherTokenV06 weth_,
-        ILiquidityProviderSandbox sandbox_
+        ILiquidityProviderSandbox sandbox_,
+        bytes32 greedyTokensBloomFilter
     )
         public
         FixinEIP712(zeroExAddress)
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
         weth = weth_;
         sandbox = sandbox_;

contracts/zero-ex/contracts/src/features/NativeOrdersFeature.sol

@@ -34,14 +34,15 @@ contract NativeOrdersFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "LimitOrders";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 2, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 1);
 
     constructor(
         address zeroExAddress,
         IEtherTokenV06 weth,
         IStaking staking,
         FeeCollectorController feeCollectorController,
-        uint32 protocolFeeMultiplier
+        uint32 protocolFeeMultiplier,
+        bytes32 greedyTokensBloomFilter
     )
         public
         NativeOrdersSettlement(
@@ -49,7 +50,8 @@ contract NativeOrdersFeature is
             weth,
             staking,
             feeCollectorController,
-            protocolFeeMultiplier
+            protocolFeeMultiplier,
+            greedyTokensBloomFilter
         )
     {
         // solhint-disable no-empty-blocks
@@ -74,13 +76,9 @@ contract NativeOrdersFeature is
         _registerFeatureFunction(this.batchCancelLimitOrders.selector);
         _registerFeatureFunction(this.batchCancelRfqOrders.selector);
         _registerFeatureFunction(this.cancelPairLimitOrders.selector);
-        _registerFeatureFunction(this.cancelPairLimitOrdersWithSigner.selector);
         _registerFeatureFunction(this.batchCancelPairLimitOrders.selector);
-        _registerFeatureFunction(this.batchCancelPairLimitOrdersWithSigner.selector);
         _registerFeatureFunction(this.cancelPairRfqOrders.selector);
-        _registerFeatureFunction(this.cancelPairRfqOrdersWithSigner.selector);
         _registerFeatureFunction(this.batchCancelPairRfqOrders.selector);
-        _registerFeatureFunction(this.batchCancelPairRfqOrdersWithSigner.selector);
         _registerFeatureFunction(this.getLimitOrderInfo.selector);
         _registerFeatureFunction(this.getRfqOrderInfo.selector);
         _registerFeatureFunction(this.getLimitOrderHash.selector);
@@ -91,8 +89,6 @@ contract NativeOrdersFeature is
         _registerFeatureFunction(this.getRfqOrderRelevantState.selector);
         _registerFeatureFunction(this.batchGetLimitOrderRelevantStates.selector);
         _registerFeatureFunction(this.batchGetRfqOrderRelevantStates.selector);
-        _registerFeatureFunction(this.registerAllowedOrderSigner.selector);
-        _registerFeatureFunction(this.isValidOrderSigner.selector);
         return LibMigrate.MIGRATE_SUCCESS;
     }
 }

contracts/zero-ex/contracts/src/features/PancakeSwapFeature.sol

@@ -1,423 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-/*
-
-  Copyright 2021 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.6.5;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
-import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
-import "../migrations/LibMigrate.sol";
-import "../fixins/FixinCommon.sol";
-import "./interfaces/IFeature.sol";
-import "./interfaces/IPancakeSwapFeature.sol";
-
-
-/// @dev VIP pancake fill functions.
-contract PancakeSwapFeature is
-    IFeature,
-    IPancakeSwapFeature,
-    FixinCommon
-{
-    /// @dev Name of this feature.
-    string public constant override FEATURE_NAME = "PancakeSwapFeature";
-    /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 1);
-    /// @dev WBNB contract.
-    IEtherTokenV06 private immutable WBNB;
-
-    // 0xFF + address of the PancakeSwap factory contract.
-    uint256 constant private FF_PANCAKESWAP_FACTORY = 0xffbcfccbde45ce874adcb698cc183debcf179528120000000000000000000000;
-    // 0xFF + address of the BakerySwap factory contract.
-    uint256 constant private FF_BAKERYSWAP_FACTORY = 0xff01bf7c66c6bd861915cdaae475042d3c4bae16a70000000000000000000000;
-    // 0xFF + address of the SushiSwap factory contract.
-    uint256 constant private FF_SUSHISWAP_FACTORY = 0xffc35DADB65012eC5796536bD9864eD8773aBc74C40000000000000000000000;
-    // Init code hash of the PancakeSwap pair contract.
-    uint256 constant private PANCAKESWAP_PAIR_INIT_CODE_HASH = 0xd0d4c4cd0848c93cb4fd1f498d7013ee6bfb25783ea21593d5834f5d250ece66;
-    // Init code hash of the BakerySwap pair contract.
-    uint256 constant private BAKERYSWAP_PAIR_INIT_CODE_HASH = 0xe2e87433120e32c4738a7d8f3271f3d872cbe16241d67537139158d90bac61d3;
-    // Init code hash of the SushiSwap pair contract.
-    uint256 constant private SUSHISWAP_PAIR_INIT_CODE_HASH = 0xe18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303;
-    // Mask of the lower 20 bytes of a bytes32.
-    uint256 constant private ADDRESS_MASK = 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
-    // BNB pseudo-token address.
-    uint256 constant private ETH_TOKEN_ADDRESS_32 = 0x000000000000000000000000eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee;
-    // Maximum token quantity that can be swapped against the PancakeSwapPair contract.
-    uint256 constant private MAX_SWAP_AMOUNT = 2**112;
-
-    // bytes4(keccak256("executeCall(address,bytes)"))
-    uint256 constant private ALLOWANCE_TARGET_EXECUTE_CALL_SELECTOR_32 = 0xbca8c7b500000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("getReserves()"))
-    uint256 constant private PANCAKESWAP_PAIR_RESERVES_CALL_SELECTOR_32 = 0x0902f1ac00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("swap(uint256,uint256,address,bytes)"))
-    uint256 constant private PANCAKESWAP_PAIR_SWAP_CALL_SELECTOR_32 = 0x022c0d9f00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("swap(uint256,uint256,address)"))
-    uint256 constant private BAKERYSWAP_PAIR_SWAP_CALL_SELECTOR_32 = 0x6d9a640a00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("transferFrom(address,address,uint256)"))
-    uint256 constant private TRANSFER_FROM_CALL_SELECTOR_32 = 0x23b872dd00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("allowance(address,address)"))
-    uint256 constant private ALLOWANCE_CALL_SELECTOR_32 = 0xdd62ed3e00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("withdraw(uint256)"))
-    uint256 constant private WETH_WITHDRAW_CALL_SELECTOR_32 = 0x2e1a7d4d00000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("deposit()"))
-    uint256 constant private WETH_DEPOSIT_CALL_SELECTOR_32 = 0xd0e30db000000000000000000000000000000000000000000000000000000000;
-    // bytes4(keccak256("transfer(address,uint256)"))
-    uint256 constant private ERC20_TRANSFER_CALL_SELECTOR_32 = 0xa9059cbb00000000000000000000000000000000000000000000000000000000;
-
-    /// @dev Construct this contract.
-    /// @param wbnb The WBNB contract.
-    constructor(IEtherTokenV06 wbnb) public {
-        WBNB = wbnb;
-    }
-
-    /// @dev Initialize and register this feature.
-    ///      Should be delegatecalled by `Migrate.migrate()`.
-    /// @return success `LibMigrate.SUCCESS` on success.
-    function migrate()
-        external
-        returns (bytes4 success)
-    {
-        _registerFeatureFunction(this.sellToPancakeSwap.selector);
-        return LibMigrate.MIGRATE_SUCCESS;
-    }
-
-    /// @dev Efficiently sell directly to pancake/BakerySwap/SushiSwap.
-    /// @param tokens Sell path.
-    /// @param sellAmount of `tokens[0]` Amount to sell.
-    /// @param minBuyAmount Minimum amount of `tokens[-1]` to buy.
-    /// @param fork The protocol fork to use.
-    /// @return buyAmount Amount of `tokens[-1]` bought.
-    function sellToPancakeSwap(
-        IERC20TokenV06[] calldata tokens,
-        uint256 sellAmount,
-        uint256 minBuyAmount,
-        ProtocolFork fork
-    )
-        external
-        payable
-        override
-        returns (uint256 buyAmount)
-    {
-        require(tokens.length > 1, "PancakeSwapFeature/InvalidTokensLength");
-        {
-            // Load immutables onto the stack.
-            IEtherTokenV06 wbnb = WBNB;
-
-            // Store some vars in memory to get around stack limits.
-            assembly {
-                // calldataload(mload(0xA00)) == first element of `tokens` array
-                mstore(0xA00, add(calldataload(0x04), 0x24))
-                // mload(0xA20) == fork
-                mstore(0xA20, fork)
-                // mload(0xA40) == WBNB
-                mstore(0xA40, wbnb)
-            }
-        }
-
-        assembly {
-            // numPairs == tokens.length - 1
-            let numPairs := sub(calldataload(add(calldataload(0x04), 0x4)), 1)
-            // We use the previous buy amount as the sell amount for the next
-            // pair in a path. So for the first swap we want to set it to `sellAmount`.
-            buyAmount := sellAmount
-            let buyToken
-            let nextPair := 0
-
-            for {let i := 0} lt(i, numPairs) {i := add(i, 1)} {
-                // sellToken = tokens[i]
-                let sellToken := loadTokenAddress(i)
-                // buyToken = tokens[i+1]
-                buyToken := loadTokenAddress(add(i, 1))
-                // The canonical ordering of this token pair.
-                let pairOrder := lt(normalizeToken(sellToken), normalizeToken(buyToken))
-
-                // Compute the pair address if it hasn't already been computed
-                // from the last iteration.
-                let pair := nextPair
-                if iszero(pair) {
-                    pair := computePairAddress(sellToken, buyToken)
-                    nextPair := 0
-                }
-
-                if iszero(i) {
-                    // This is the first token in the path.
-                    switch eq(sellToken, ETH_TOKEN_ADDRESS_32)
-                        case 0 { // Not selling BNB. Selling an ERC20 instead.
-                            // Make sure BNB was not attached to the call.
-                            if gt(callvalue(), 0) {
-                                revert(0, 0)
-                            }
-                            // For the first pair we need to transfer sellTokens into the
-                            // pair contract.
-                            moveTakerTokensTo(sellToken, pair, sellAmount)
-                        }
-                        default {
-                            // If selling BNB, we need to wrap it to WBNB and transfer to the
-                            // pair contract.
-                            if iszero(eq(callvalue(), sellAmount)) {
-                                revert(0, 0)
-                            }
-                            sellToken := mload(0xA40)// Re-assign to WBNB
-                            // Call `WBNB.deposit{value: sellAmount}()`
-                            mstore(0xB00, WETH_DEPOSIT_CALL_SELECTOR_32)
-                            if iszero(call(gas(), sellToken, sellAmount, 0xB00, 0x4, 0x00, 0x0)) {
-                                bubbleRevert()
-                            }
-                            // Call `WBNB.transfer(pair, sellAmount)`
-                            mstore(0xB00, ERC20_TRANSFER_CALL_SELECTOR_32)
-                            mstore(0xB04, pair)
-                            mstore(0xB24, sellAmount)
-                            if iszero(call(gas(), sellToken, 0, 0xB00, 0x44, 0x00, 0x0)) {
-                                bubbleRevert()
-                            }
-                        }
-                    // No need to check results, if deposit/transfers failed the PancakeSwapPair will
-                    // reject our trade (or it may succeed if somehow the reserve was out of sync)
-                    // this is fine for the taker.
-                }
-
-                // Call pair.getReserves(), store the results at `0xC00`
-                mstore(0xB00, PANCAKESWAP_PAIR_RESERVES_CALL_SELECTOR_32)
-                if iszero(staticcall(gas(), pair, 0xB00, 0x4, 0xC00, 0x40)) {
-                    bubbleRevert()
-                }
-                // Revert if the pair contract does not return at least two words.
-                if lt(returndatasize(), 0x40) {
-                    mstore(0, pair)
-                    revert(0, 32)
-                }
-
-                // Sell amount for this hop is the previous buy amount.
-                let pairSellAmount := buyAmount
-                // Compute the buy amount based on the pair reserves.
-                {
-                    let sellReserve
-                    let buyReserve
-                    switch iszero(pairOrder)
-                        case 0 {
-                            // Transpose if pair order is different.
-                            sellReserve := mload(0xC00)
-                            buyReserve := mload(0xC20)
-                        }
-                        default {
-                            sellReserve := mload(0xC20)
-                            buyReserve := mload(0xC00)
-                        }
-                    // Ensure that the sellAmount is < 2¹¹².
-                    if gt(pairSellAmount, MAX_SWAP_AMOUNT) {
-                        revert(0, 0)
-                    }
-                    // Pairs are in the range (0, 2¹¹²) so this shouldn't overflow.
-                    // buyAmount = (pairSellAmount * 997 * buyReserve) /
-                    //     (pairSellAmount * 997 + sellReserve * 1000);
-                    let sellAmountWithFee := mul(pairSellAmount, 997)
-                    buyAmount := div(
-                        mul(sellAmountWithFee, buyReserve),
-                        add(sellAmountWithFee, mul(sellReserve, 1000))
-                    )
-                }
-
-                let receiver
-                // Is this the last pair contract?
-                switch eq(add(i, 1), numPairs)
-                    case 0 {
-                        // Not the last pair contract, so forward bought tokens to
-                        // the next pair contract.
-                        nextPair := computePairAddress(
-                            buyToken,
-                            loadTokenAddress(add(i, 2))
-                        )
-                        receiver := nextPair
-                    }
-                    default {
-                        // The last pair contract.
-                        // Forward directly to taker UNLESS they want BNB back.
-                        switch eq(buyToken, ETH_TOKEN_ADDRESS_32)
-                            case 0 {
-                                receiver := caller()
-                            }
-                            default {
-                                receiver := address()
-                            }
-                    }
-
-                // Call pair.swap()
-                switch mload(0xA20) // fork
-                    case 1 {
-                        mstore(0xB00, BAKERYSWAP_PAIR_SWAP_CALL_SELECTOR_32)
-                    }
-                    default {
-                        mstore(0xB00, PANCAKESWAP_PAIR_SWAP_CALL_SELECTOR_32)
-                    }
-                switch pairOrder
-                    case 0 {
-                        mstore(0xB04, buyAmount)
-                        mstore(0xB24, 0)
-                    }
-                    default {
-                        mstore(0xB04, 0)
-                        mstore(0xB24, buyAmount)
-                    }
-                mstore(0xB44, receiver)
-                mstore(0xB64, 0x80)
-                mstore(0xB84, 0)
-                if iszero(call(gas(), pair, 0, 0xB00, 0xA4, 0, 0)) {
-                    bubbleRevert()
-                }
-            } // End for-loop.
-
-            // If buying BNB, unwrap the WBNB first
-            if eq(buyToken, ETH_TOKEN_ADDRESS_32) {
-                // Call `WBNB.withdraw(buyAmount)`
-                mstore(0xB00, WETH_WITHDRAW_CALL_SELECTOR_32)
-                mstore(0xB04, buyAmount)
-                if iszero(call(gas(), mload(0xA40), 0, 0xB00, 0x24, 0x00, 0x0)) {
-                    bubbleRevert()
-                }
-                // Transfer BNB to the caller.
-                if iszero(call(gas(), caller(), buyAmount, 0xB00, 0x0, 0x00, 0x0)) {
-                    bubbleRevert()
-                }
-            }
-
-            // Functions ///////////////////////////////////////////////////////
-
-            // Load a token address from the `tokens` calldata argument.
-            function loadTokenAddress(idx) -> addr {
-                addr := and(ADDRESS_MASK, calldataload(add(mload(0xA00), mul(idx, 0x20))))
-            }
-
-            // Convert BNB pseudo-token addresses to WBNB.
-            function normalizeToken(token) -> normalized {
-                normalized := token
-                // Translate BNB pseudo-tokens to WBNB.
-                if eq(token, ETH_TOKEN_ADDRESS_32) {
-                    normalized := mload(0xA40)
-                }
-            }
-
-            // Compute the address of the PancakeSwapPair contract given two
-            // tokens.
-            function computePairAddress(tokenA, tokenB) -> pair {
-                // Convert BNB pseudo-token addresses to WBNB.
-                tokenA := normalizeToken(tokenA)
-                tokenB := normalizeToken(tokenB)
-                // There is one contract for every combination of tokens,
-                // which is deployed using CREATE2.
-                // The derivation of this address is given by:
-                //   address(keccak256(abi.encodePacked(
-                //       bytes(0xFF),
-                //       address(PANCAKESWAP_FACTORY_ADDRESS),
-                //       keccak256(abi.encodePacked(
-                //           tokenA < tokenB ? tokenA : tokenB,
-                //           tokenA < tokenB ? tokenB : tokenA,
-                //       )),
-                //       bytes32(PANCAKESWAP_PAIR_INIT_CODE_HASH),
-                //   )));
-
-                // Compute the salt (the hash of the sorted tokens).
-                // Tokens are written in reverse memory order to packed encode
-                // them as two 20-byte values in a 40-byte chunk of memory
-                // starting at 0xB0C.
-                switch lt(tokenA, tokenB)
-                    case 0 {
-                        mstore(0xB14, tokenA)
-                        mstore(0xB00, tokenB)
-                    }
-                    default {
-                        mstore(0xB14, tokenB)
-                        mstore(0xB00, tokenA)
-                    }
-                let salt := keccak256(0xB0C, 0x28)
-                // Compute the pair address by hashing all the components together.
-                switch mload(0xA20) // fork
-                    case 0 {
-                        mstore(0xB00, FF_PANCAKESWAP_FACTORY)
-                        mstore(0xB15, salt)
-                        mstore(0xB35, PANCAKESWAP_PAIR_INIT_CODE_HASH)
-                    }
-                    case 1 {
-                        mstore(0xB00, FF_BAKERYSWAP_FACTORY)
-                        mstore(0xB15, salt)
-                        mstore(0xB35, BAKERYSWAP_PAIR_INIT_CODE_HASH)
-                    }
-                    default {
-                        mstore(0xB00, FF_SUSHISWAP_FACTORY)
-                        mstore(0xB15, salt)
-                        mstore(0xB35, SUSHISWAP_PAIR_INIT_CODE_HASH)
-                    }
-                pair := and(ADDRESS_MASK, keccak256(0xB00, 0x55))
-            }
-
-            // Revert with the return data from the most recent call.
-            function bubbleRevert() {
-                returndatacopy(0, 0, returndatasize())
-                revert(0, returndatasize())
-            }
-
-            // Move `amount` tokens from the taker/caller to `to`.
-            function moveTakerTokensTo(token, to, amount) {
-                // Perform a `transferFrom()`
-                mstore(0xB00, TRANSFER_FROM_CALL_SELECTOR_32)
-                mstore(0xB04, caller())
-                mstore(0xB24, to)
-                mstore(0xB44, amount)
-
-                let success := call(
-                    gas(),
-                    token,
-                    0,
-                    0xB00,
-                    0x64,
-                    0xC00,
-                    // Copy only the first 32 bytes of return data. We
-                    // only care about reading a boolean in the success
-                    // case. We will use returndatacopy() in the failure case.
-                    0x20
-                )
-
-                let rdsize := returndatasize()
-
-                // Check for ERC20 success. ERC20 tokens should
-                // return a boolean, but some return nothing or
-                // extra data. We accept 0-length return data as
-                // success, or at least 32 bytes that starts with
-                // a 32-byte boolean true.
-                success := and(
-                    success,                         // call itself succeeded
-                    or(
-                        iszero(rdsize),              // no return data, or
-                        and(
-                            iszero(lt(rdsize, 32)),  // at least 32 bytes
-                            eq(mload(0xC00), 1)      // starts with uint256(1)
-                        )
-                    )
-                )
-
-                if iszero(success) {
-                    // Revert with the data returned from the transferFrom call.
-                    returndatacopy(0, 0, rdsize)
-                    revert(0, rdsize)
-                }
-            }
-        }
-
-        // Revert if we bought too little.
-        require(buyAmount >= minBuyAmount, "PancakeSwapFeature/UnderBought");
-    }
-}

contracts/zero-ex/contracts/src/features/TokenSpenderFeature.sol

@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
+import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/LibERC20TokenV06.sol";
+import "../errors/LibSpenderRichErrors.sol";
+import "../fixins/FixinCommon.sol";
+import "../migrations/LibMigrate.sol";
+import "../external/IAllowanceTarget.sol";
+import "../storage/LibTokenSpenderStorage.sol";
+import "./interfaces/IFeature.sol";
+import "./interfaces/ITokenSpenderFeature.sol";
+
+
+/// @dev Feature that allows spending token allowances.
+contract TokenSpenderFeature is
+    IFeature,
+    ITokenSpenderFeature,
+    FixinCommon
+{
+    // solhint-disable
+    /// @dev Name of this feature.
+    string public constant override FEATURE_NAME = "TokenSpender";
+    /// @dev Version of this feature.
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 0);
+    // solhint-enable
+
+    using LibRichErrorsV06 for bytes;
+
+    /// @dev Initialize and register this feature. Should be delegatecalled
+    ///      into during a `Migrate.migrate()`.
+    /// @param allowanceTarget An `allowanceTarget` instance, configured to have
+    ///        the ZeroeEx contract as an authority.
+    /// @return success `MIGRATE_SUCCESS` on success.
+    function migrate(IAllowanceTarget allowanceTarget)
+        external
+        returns (bytes4 success)
+    {
+        LibTokenSpenderStorage.getStorage().allowanceTarget = allowanceTarget;
+        _registerFeatureFunction(this.getAllowanceTarget.selector);
+        _registerFeatureFunction(this._spendERC20Tokens.selector);
+        _registerFeatureFunction(this.getSpendableERC20BalanceOf.selector);
+        return LibMigrate.MIGRATE_SUCCESS;
+    }
+
+    /// @dev Transfers ERC20 tokens from `owner` to `to`. Only callable from within.
+    /// @param token The token to spend.
+    /// @param owner The owner of the tokens.
+    /// @param to The recipient of the tokens.
+    /// @param amount The amount of `token` to transfer.
+    function _spendERC20Tokens(
+        IERC20TokenV06 token,
+        address owner,
+        address to,
+        uint256 amount
+    )
+        external
+        override
+        onlySelf
+    {
+        IAllowanceTarget spender = LibTokenSpenderStorage.getStorage().allowanceTarget;
+        // Have the allowance target execute an ERC20 `transferFrom()`.
+        (bool didSucceed, bytes memory resultData) = address(spender).call(
+            abi.encodeWithSelector(
+                IAllowanceTarget.executeCall.selector,
+                address(token),
+                abi.encodeWithSelector(
+                    IERC20TokenV06.transferFrom.selector,
+                    owner,
+                    to,
+                    amount
+                )
+            )
+        );
+        if (didSucceed) {
+            resultData = abi.decode(resultData, (bytes));
+        }
+        if (!didSucceed || !LibERC20TokenV06.isSuccessfulResult(resultData)) {
+            LibSpenderRichErrors.SpenderERC20TransferFromFailedError(
+                address(token),
+                owner,
+                to,
+                amount,
+                resultData
+            ).rrevert();
+        }
+    }
+
+    /// @dev Gets the maximum amount of an ERC20 token `token` that can be
+    ///      pulled from `owner` by the token spender.
+    /// @param token The token to spend.
+    /// @param owner The owner of the tokens.
+    /// @return amount The amount of tokens that can be pulled.
+    function getSpendableERC20BalanceOf(IERC20TokenV06 token, address owner)
+        external
+        override
+        view
+        returns (uint256 amount)
+    {
+        return LibSafeMathV06.min256(
+            token.allowance(owner, address(LibTokenSpenderStorage.getStorage().allowanceTarget)),
+            token.balanceOf(owner)
+        );
+    }
+
+    /// @dev Get the address of the allowance target.
+    /// @return target The target of token allowances.
+    function getAllowanceTarget()
+        external
+        override
+        view
+        returns (address target)
+    {
+        return address(LibTokenSpenderStorage.getStorage().allowanceTarget);
+    }
+}

contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol

@@ -60,7 +60,10 @@ contract TransformERC20Feature is
     /// @dev Version of this feature.
     uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 3, 1);
 
-    constructor() public {}
+    constructor(bytes32 greedyTokensBloomFilter)
+        public
+        FixinTokenSpender(greedyTokensBloomFilter)
+    {}
 
     /// @dev Initialize and register this feature.
     ///      Should be delegatecalled by `Migrate.migrate()`.

contracts/zero-ex/contracts/src/features/UniswapFeature.sol

@@ -23,6 +23,7 @@ pragma experimental ABIEncoderV2;
 import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
 import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
 import "../migrations/LibMigrate.sol";
+import "../external/IAllowanceTarget.sol";
 import "../fixins/FixinCommon.sol";
 import "./interfaces/IFeature.sol";
 import "./interfaces/IUniswapFeature.sol";
@@ -37,9 +38,13 @@ contract UniswapFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "UniswapFeature";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 2);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 1);
+    /// @dev A bloom filter for tokens that consume all gas when `transferFrom()` fails.
+    bytes32 public immutable GREEDY_TOKENS_BLOOM_FILTER;
     /// @dev WETH contract.
     IEtherTokenV06 private immutable WETH;
+    /// @dev AllowanceTarget instance.
+    IAllowanceTarget private immutable ALLOWANCE_TARGET;
 
     // 0xFF + address of the UniswapV2Factory contract.
     uint256 constant private FF_UNISWAP_FACTORY = 0xFF5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f0000000000000000000000;
@@ -75,8 +80,16 @@ contract UniswapFeature is
 
     /// @dev Construct this contract.
     /// @param weth The WETH contract.
-    constructor(IEtherTokenV06 weth) public {
+    /// @param allowanceTarget The AllowanceTarget contract.
+    /// @param greedyTokensBloomFilter The bloom filter for greedy tokens.
+    constructor(
+        IEtherTokenV06 weth,
+        IAllowanceTarget allowanceTarget,
+        bytes32 greedyTokensBloomFilter
+    ) public {
         WETH = weth;
+        ALLOWANCE_TARGET = allowanceTarget;
+        GREEDY_TOKENS_BLOOM_FILTER = greedyTokensBloomFilter;
     }
 
     /// @dev Initialize and register this feature.
@@ -111,6 +124,8 @@ contract UniswapFeature is
         {
             // Load immutables onto the stack.
             IEtherTokenV06 weth = WETH;
+            IAllowanceTarget allowanceTarget = ALLOWANCE_TARGET;
+            bytes32 greedyTokensBloomFilter = GREEDY_TOKENS_BLOOM_FILTER;
 
             // Store some vars in memory to get around stack limits.
             assembly {
@@ -120,6 +135,10 @@ contract UniswapFeature is
                 mstore(0xA20, isSushi)
                 // mload(0xA40) == WETH
                 mstore(0xA40, weth)
+                // mload(0xA60) == ALLOWANCE_TARGET
+                mstore(0xA60, allowanceTarget)
+                // mload(0xA80) == GREEDY_TOKENS_BLOOM_FILTER
+                mstore(0xA80, greedyTokensBloomFilter)
             }
         }
 
@@ -354,7 +373,38 @@ contract UniswapFeature is
 
             // Move `amount` tokens from the taker/caller to `to`.
             function moveTakerTokensTo(token, to, amount) {
-                // Perform a `transferFrom()`
+
+                // If the token is possibly greedy, we check the allowance rather
+                // than relying on letting the transferFrom() call fail and
+                // falling through to legacy allowance target because the token
+                // will eat all our gas.
+                if isTokenPossiblyGreedy(token) {
+                    // Check if we have enough direct allowance by calling
+                    // `token.allowance()`
+                    mstore(0xB00, ALLOWANCE_CALL_SELECTOR_32)
+                    mstore(0xB04, caller())
+                    mstore(0xB24, address())
+                    let success := staticcall(gas(), token, 0xB00, 0x44, 0xC00, 0x20)
+                    if iszero(success) {
+                        // Call to allowance() failed.
+                        bubbleRevert()
+                    }
+                    // Make sure the allowance call returned at least a word.
+                    if lt(returndatasize(), 0x20) {
+                        revert(0, 0)
+                    }
+                    // Call succeeded.
+                    // Result is stored in 0xC00-0xC20.
+                    if lt(mload(0xC00), amount) {
+                        // We don't have enough direct allowance, so try
+                        // going through the legacy allowance taregt.
+                        moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount)
+                        leave
+                    }
+                }
+
+                // Otherwise we will optimistically try to perform a `transferFrom()`
+                // directly then if it fails we will go through the legacy allowance target.
                 mstore(0xB00, TRANSFER_FROM_CALL_SELECTOR_32)
                 mstore(0xB04, caller())
                 mstore(0xB24, to)
@@ -369,7 +419,8 @@ contract UniswapFeature is
                     0xC00,
                     // Copy only the first 32 bytes of return data. We
                     // only care about reading a boolean in the success
-                    // case. We will use returndatacopy() in the failure case.
+                    // case, and we discard the return data in the
+                    // failure case.
                     0x20
                 )
 
@@ -392,11 +443,37 @@ contract UniswapFeature is
                 )
 
                 if iszero(success) {
-                    // Revert with the data returned from the transferFrom call.
-                    returndatacopy(0, 0, rdsize)
-                    revert(0, rdsize)
+                    // Try to fall back to the allowance target.
+                    moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount)
                 }
             }
+
+            // Move tokens by going through the legacy allowance target contract.
+            function moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount) {
+                mstore(0xB00, ALLOWANCE_TARGET_EXECUTE_CALL_SELECTOR_32)
+                mstore(0xB04, token)
+                mstore(0xB24, 0x40)
+                mstore(0xB44, 0x64)
+                mstore(0xB64, TRANSFER_FROM_CALL_SELECTOR_32)
+                mstore(0xB68, caller())
+                mstore(0xB88, to)
+                mstore(0xBA8, amount)
+                if iszero(call(gas(), mload(0xA60), 0, 0xB00, 0xC8, 0x00, 0x0)) {
+                    bubbleRevert()
+                }
+                // If this fall back failed, the swap will most likely fail
+                // so there's no need to validate the result.
+            }
+
+            // Checks if a token possibly belongs to the GREEDY_TOKENS_BLOOM_FILTER
+            // bloom filter.
+            function isTokenPossiblyGreedy(token) -> isPossiblyGreedy {
+                // The hash is given by:
+                // (1 << (keccak256(token) % 256)) | (1 << (token % 256))
+                mstore(0, token)
+                let h := or(shl(mod(keccak256(0, 32), 256), 1), shl(mod(token, 256), 1))
+                isPossiblyGreedy := eq(and(h, mload(0xA80)), h)
+            }
         }
 
         // Revert if we bought too little.

contracts/zero-ex/contracts/src/features/interfaces/INativeOrdersEvents.sol

@@ -113,14 +113,4 @@ interface INativeOrdersEvents {
         address[] addrs,
         bool allowed
     );
-
-    /// @dev Emitted when new order signers are registered
-    /// @param maker The maker address that is registering a designated signer.
-    /// @param signer The address that will sign on behalf of maker.
-    /// @param allowed Indicates whether the address should be allowed.
-    event OrderSignerRegistered(
-        address maker,
-        address signer,
-        bool allowed
-    );
 }

contracts/zero-ex/contracts/src/features/interfaces/INativeOrdersFeature.sol

@@ -137,13 +137,13 @@ interface INativeOrdersFeature is
         external
         returns (uint128 takerTokenFilledAmount, uint128 makerTokenFilledAmount);
 
-    /// @dev Cancel a single limit order. The caller must be the maker or a valid order signer.
+    /// @dev Cancel a single limit order. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param order The limit order.
     function cancelLimitOrder(LibNativeOrder.LimitOrder calldata order)
         external;
 
-    /// @dev Cancel a single RFQ order. The caller must be the maker or a valid order signer.
+    /// @dev Cancel a single RFQ order. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param order The RFQ order.
     function cancelRfqOrder(LibNativeOrder.RfqOrder calldata order)
@@ -156,13 +156,13 @@ interface INativeOrdersFeature is
     function registerAllowedRfqOrigins(address[] memory origins, bool allowed)
         external;
 
-    /// @dev Cancel multiple limit orders. The caller must be the maker or a valid order signer.
+    /// @dev Cancel multiple limit orders. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param orders The limit orders.
     function batchCancelLimitOrders(LibNativeOrder.LimitOrder[] calldata orders)
         external;
 
-    /// @dev Cancel multiple RFQ orders. The caller must be the maker or a valid order signer.
+    /// @dev Cancel multiple RFQ orders. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param orders The RFQ orders.
     function batchCancelRfqOrders(LibNativeOrder.RfqOrder[] calldata orders)
@@ -183,23 +183,7 @@ interface INativeOrdersFeature is
         external;
 
     /// @dev Cancel all limit orders for a given maker and pair with a salt less
-    ///      than the value provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same maker and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker The maker for which to cancel.
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function cancelPairLimitOrdersWithSigner(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        external;
-
-    /// @dev Cancel all limit orders for a given maker and pairs with salts less
-    ///      than the values provided. The caller must be the maker. Subsequent
+    ///      than the value provided. The caller must be the maker. Subsequent
     ///      calls to this function with the same caller and pair require the
     ///      new salt to be >= the old salt.
     /// @param makerTokens The maker tokens.
@@ -212,22 +196,6 @@ interface INativeOrdersFeature is
     )
         external;
 
-    /// @dev Cancel all limit orders for a given maker and pairs with salts less
-    ///      than the values provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same maker and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker The maker for which to cancel.
-    /// @param makerTokens The maker tokens.
-    /// @param takerTokens The taker tokens.
-    /// @param minValidSalts The new minimum valid salts.
-    function batchCancelPairLimitOrdersWithSigner(
-        address maker,
-        IERC20TokenV06[] memory makerTokens,
-        IERC20TokenV06[] memory takerTokens,
-        uint256[] memory minValidSalts
-    )
-        external;
-
     /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
     ///      than the value provided. The caller must be the maker. Subsequent
     ///      calls to this function with the same caller and pair require the
@@ -243,23 +211,7 @@ interface INativeOrdersFeature is
         external;
 
     /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
-    ///      than the value provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same maker and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker The maker for which to cancel.
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function cancelPairRfqOrdersWithSigner(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        external;
-
-    /// @dev Cancel all RFQ orders for a given maker and pairs with salts less
-    ///      than the values provided. The caller must be the maker. Subsequent
+    ///      than the value provided. The caller must be the maker. Subsequent
     ///      calls to this function with the same caller and pair require the
     ///      new salt to be >= the old salt.
     /// @param makerTokens The maker tokens.
@@ -272,22 +224,6 @@ interface INativeOrdersFeature is
     )
         external;
 
-    /// @dev Cancel all RFQ orders for a given maker and pairs with salts less
-    ///      than the values provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same maker and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker The maker for which to cancel.
-    /// @param makerTokens The maker tokens.
-    /// @param takerTokens The taker tokens.
-    /// @param minValidSalts The new minimum valid salts.
-    function batchCancelPairRfqOrdersWithSigner(
-        address maker,
-        IERC20TokenV06[] memory makerTokens,
-        IERC20TokenV06[] memory takerTokens,
-        uint256[] memory minValidSalts
-    )
-        external;
-
     /// @dev Get the order info for a limit order.
     /// @param order The limit order.
     /// @return orderInfo Info about the order.
@@ -409,25 +345,4 @@ interface INativeOrdersFeature is
             uint128[] memory actualFillableTakerTokenAmounts,
             bool[] memory isSignatureValids
         );
-
-    /// @dev Register a signer who can sign on behalf of msg.sender
-    ///      This allows one to sign on behalf of a contract that calls this function
-    /// @param signer The address from which you plan to generate signatures
-    /// @param allowed True to register, false to unregister.
-    function registerAllowedOrderSigner(
-        address signer,
-        bool allowed
-    )
-        external;
-
-    /// @dev checks if a given address is registered to sign on behalf of a maker address
-    /// @param maker The maker address encoded in an order (can be a contract)
-    /// @param signer The address that is providing a signature
-    function isValidOrderSigner(
-        address maker,
-        address signer
-    )
-        external
-        view
-        returns (bool isAllowed);
 }

contracts/zero-ex/contracts/src/features/interfaces/IPancakeSwapFeature.sol

@@ -1,50 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-/*
-
-  Copyright 2021 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.6.5;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
-
-
-/// @dev VIP PancakeSwap/BakerySwap/SushiSwap fill functions.
-interface IPancakeSwapFeature {
-
-    enum ProtocolFork {
-        PancakeSwap,
-        BakerySwap,
-        SushiSwap
-    }
-
-    /// @dev Efficiently sell directly to PancakeSwap/BakerySwap/Sushiswap.
-    /// @param tokens Sell path.
-    /// @param sellAmount of `tokens[0]` Amount to sell.
-    /// @param minBuyAmount Minimum amount of `tokens[-1]` to buy.
-    /// @param fork The protocol fork to use.
-    /// @return buyAmount Amount of `tokens[-1]` bought.
-    function sellToPancakeSwap(
-        IERC20TokenV06[] calldata tokens,
-        uint256 sellAmount,
-        uint256 minBuyAmount,
-        ProtocolFork fork
-    )
-        external
-        payable
-        returns (uint256 buyAmount);
-}

contracts/zero-ex/contracts/src/features/native_orders/NativeOrdersCancellation.sol

@@ -40,22 +40,23 @@ abstract contract NativeOrdersCancellation is
     uint256 private constant HIGH_BIT = 1 << 255;
 
     constructor(
-        address zeroExAddress
+        address zeroExAddress,
+        bytes32 greedyTokensBloomFilter
     )
         internal
-        NativeOrdersInfo(zeroExAddress)
+        NativeOrdersInfo(zeroExAddress, greedyTokensBloomFilter)
     {
         // solhint-disable no-empty-blocks
     }
 
-    /// @dev Cancel a single limit order. The caller must be the maker or a valid order signer.
+    /// @dev Cancel a single limit order. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param order The limit order.
     function cancelLimitOrder(LibNativeOrder.LimitOrder memory order)
         public
     {
         bytes32 orderHash = getLimitOrderHash(order);
-        if (msg.sender != order.maker && !isValidOrderSigner(order.maker, msg.sender)) {
+        if (msg.sender != order.maker) {
             LibNativeOrdersRichErrors.OnlyOrderMakerAllowed(
                 orderHash,
                 msg.sender,
@@ -65,14 +66,14 @@ abstract contract NativeOrdersCancellation is
         _cancelOrderHash(orderHash, order.maker);
     }
 
-    /// @dev Cancel a single RFQ order. The caller must be the maker or a valid order signer.
+    /// @dev Cancel a single RFQ order. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param order The RFQ order.
     function cancelRfqOrder(LibNativeOrder.RfqOrder memory order)
         public
     {
         bytes32 orderHash = getRfqOrderHash(order);
-        if (msg.sender != order.maker && !isValidOrderSigner(order.maker, msg.sender)) {
+        if (msg.sender != order.maker) {
             LibNativeOrdersRichErrors.OnlyOrderMakerAllowed(
                 orderHash,
                 msg.sender,
@@ -82,7 +83,7 @@ abstract contract NativeOrdersCancellation is
         _cancelOrderHash(orderHash, order.maker);
     }
 
-    /// @dev Cancel multiple limit orders. The caller must be the maker or a valid order signer.
+    /// @dev Cancel multiple limit orders. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param orders The limit orders.
     function batchCancelLimitOrders(LibNativeOrder.LimitOrder[] memory orders)
@@ -93,7 +94,7 @@ abstract contract NativeOrdersCancellation is
         }
     }
 
-    /// @dev Cancel multiple RFQ orders. The caller must be the maker or a valid order signer.
+    /// @dev Cancel multiple RFQ orders. The caller must be the maker.
     ///      Silently succeeds if the order has already been cancelled.
     /// @param orders The RFQ orders.
     function batchCancelRfqOrders(LibNativeOrder.RfqOrder[] memory orders)
@@ -118,34 +119,33 @@ abstract contract NativeOrdersCancellation is
     )
         public
     {
-        _cancelPairLimitOrders(msg.sender, makerToken, takerToken, minValidSalt);
-    }
+        LibNativeOrdersStorage.Storage storage stor =
+            LibNativeOrdersStorage.getStorage();
 
-    /// @dev Cancel all limit orders for a given maker and pair with a salt less
-    ///      than the value provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same caller and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker the maker for whom the msg.sender is the signer.
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function cancelPairLimitOrdersWithSigner(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        public
-    {
-        // verify that the signer is authorized for the maker
-        if (!isValidOrderSigner(maker, msg.sender)) {
-            LibNativeOrdersRichErrors.InvalidSignerError(
-                maker,
-                msg.sender
-            ).rrevert();
+        uint256 oldMinValidSalt =
+            stor.limitOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
+                [msg.sender]
+                [address(makerToken)]
+                [address(takerToken)];
+
+        // New min salt must >= the old one.
+        if (oldMinValidSalt > minValidSalt) {
+            LibNativeOrdersRichErrors.
+                CancelSaltTooLowError(minValidSalt, oldMinValidSalt)
+                    .rrevert();
         }
 
-        _cancelPairLimitOrders(maker, makerToken, takerToken, minValidSalt);
+        stor.limitOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
+            [msg.sender]
+            [address(makerToken)]
+            [address(takerToken)] = minValidSalt;
+
+        emit PairCancelledLimitOrders(
+            msg.sender,
+            address(makerToken),
+            address(takerToken),
+            minValidSalt
+        );
     }
 
     /// @dev Cancel all limit orders for a given maker and pair with a salt less
@@ -169,47 +169,7 @@ abstract contract NativeOrdersCancellation is
         );
 
         for (uint256 i = 0; i < makerTokens.length; ++i) {
-            _cancelPairLimitOrders(
-                msg.sender,
-                makerTokens[i],
-                takerTokens[i],
-                minValidSalts[i]
-            );
-        }
-    }
-
-    /// @dev Cancel all limit orders for a given maker and pair with a salt less
-    ///      than the value provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same caller and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker the maker for whom the msg.sender is the signer.
-    /// @param makerTokens The maker tokens.
-    /// @param takerTokens The taker tokens.
-    /// @param minValidSalts The new minimum valid salts.
-    function batchCancelPairLimitOrdersWithSigner(
-        address maker,
-        IERC20TokenV06[] memory makerTokens,
-        IERC20TokenV06[] memory takerTokens,
-        uint256[] memory minValidSalts
-    )
-        public
-    {
-        require(
-            makerTokens.length == takerTokens.length &&
-            makerTokens.length == minValidSalts.length,
-            "NativeOrdersFeature/MISMATCHED_PAIR_ORDERS_ARRAY_LENGTHS"
-        );
-
-        if (!isValidOrderSigner(maker, msg.sender)) {
-            LibNativeOrdersRichErrors.InvalidSignerError(
-                maker,
-                msg.sender
-            ).rrevert();
-        }
-
-        for (uint256 i = 0; i < makerTokens.length; ++i) {
-            _cancelPairLimitOrders(
-                maker,
+            cancelPairLimitOrders(
                 makerTokens[i],
                 takerTokens[i],
                 minValidSalts[i]
@@ -231,33 +191,33 @@ abstract contract NativeOrdersCancellation is
     )
         public
     {
-        _cancelPairRfqOrders(msg.sender, makerToken, takerToken, minValidSalt);
-    }
+        LibNativeOrdersStorage.Storage storage stor =
+            LibNativeOrdersStorage.getStorage();
 
-    /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
-    ///      than the value provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same caller and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker the maker for whom the msg.sender is the signer.
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function cancelPairRfqOrdersWithSigner(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        public
-    {
-        if (!isValidOrderSigner(maker, msg.sender)) {
-            LibNativeOrdersRichErrors.InvalidSignerError(
-                maker,
-                msg.sender
-            ).rrevert();
+        uint256 oldMinValidSalt =
+            stor.rfqOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
+                [msg.sender]
+                [address(makerToken)]
+                [address(takerToken)];
+
+        // New min salt must >= the old one.
+        if (oldMinValidSalt > minValidSalt) {
+            LibNativeOrdersRichErrors.
+                CancelSaltTooLowError(minValidSalt, oldMinValidSalt)
+                    .rrevert();
         }
 
-        _cancelPairRfqOrders(maker, makerToken, takerToken, minValidSalt);
+        stor.rfqOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
+            [msg.sender]
+            [address(makerToken)]
+            [address(takerToken)] = minValidSalt;
+
+        emit PairCancelledRfqOrders(
+            msg.sender,
+            address(makerToken),
+            address(takerToken),
+            minValidSalt
+        );
     }
 
     /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
@@ -281,47 +241,7 @@ abstract contract NativeOrdersCancellation is
         );
 
         for (uint256 i = 0; i < makerTokens.length; ++i) {
-            _cancelPairRfqOrders(
-                msg.sender,
-                makerTokens[i],
-                takerTokens[i],
-                minValidSalts[i]
-            );
-        }
-    }
-
-    /// @dev Cancel all RFQ orders for a given maker and pairs with salts less
-    ///      than the values provided. The caller must be a signer registered to the maker.
-    ///      Subsequent calls to this function with the same caller and pair require the
-    ///      new salt to be >= the old salt.
-    /// @param maker the maker for whom the msg.sender is the signer.
-    /// @param makerTokens The maker tokens.
-    /// @param takerTokens The taker tokens.
-    /// @param minValidSalts The new minimum valid salts.
-    function batchCancelPairRfqOrdersWithSigner(
-        address maker,
-        IERC20TokenV06[] memory makerTokens,
-        IERC20TokenV06[] memory takerTokens,
-        uint256[] memory minValidSalts
-    )
-        public
-    {
-        require(
-            makerTokens.length == takerTokens.length &&
-            makerTokens.length == minValidSalts.length,
-            "NativeOrdersFeature/MISMATCHED_PAIR_ORDERS_ARRAY_LENGTHS"
-        );
-
-        if (!isValidOrderSigner(maker, msg.sender)) {
-            LibNativeOrdersRichErrors.InvalidSignerError(
-                maker,
-                msg.sender
-            ).rrevert();
-        }
-
-        for (uint256 i = 0; i < makerTokens.length; ++i) {
-            _cancelPairRfqOrders(
-                maker,
+            cancelPairRfqOrders(
                 makerTokens[i],
                 takerTokens[i],
                 minValidSalts[i]
@@ -343,90 +263,4 @@ abstract contract NativeOrdersCancellation is
 
         emit OrderCancelled(orderHash, maker);
     }
-
-    /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
-    ///      than the value provided.
-    /// @param maker The target maker address
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function _cancelPairRfqOrders(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        private
-    {
-        LibNativeOrdersStorage.Storage storage stor =
-            LibNativeOrdersStorage.getStorage();
-
-        uint256 oldMinValidSalt =
-            stor.rfqOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
-                [maker]
-                [address(makerToken)]
-                [address(takerToken)];
-
-        // New min salt must >= the old one.
-        if (oldMinValidSalt > minValidSalt) {
-            LibNativeOrdersRichErrors.
-                CancelSaltTooLowError(minValidSalt, oldMinValidSalt)
-                    .rrevert();
-        }
-
-        stor.rfqOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
-            [maker]
-            [address(makerToken)]
-            [address(takerToken)] = minValidSalt;
-
-        emit PairCancelledRfqOrders(
-            maker,
-            address(makerToken),
-            address(takerToken),
-            minValidSalt
-        );
-    }
-
-    /// @dev Cancel all limit orders for a given maker and pair with a salt less
-    ///      than the value provided.
-    /// @param maker The target maker address
-    /// @param makerToken The maker token.
-    /// @param takerToken The taker token.
-    /// @param minValidSalt The new minimum valid salt.
-    function _cancelPairLimitOrders(
-        address maker,
-        IERC20TokenV06 makerToken,
-        IERC20TokenV06 takerToken,
-        uint256 minValidSalt
-    )
-        private
-    {
-        LibNativeOrdersStorage.Storage storage stor =
-            LibNativeOrdersStorage.getStorage();
-
-        uint256 oldMinValidSalt =
-            stor.limitOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
-                [maker]
-                [address(makerToken)]
-                [address(takerToken)];
-
-        // New min salt must >= the old one.
-        if (oldMinValidSalt > minValidSalt) {
-            LibNativeOrdersRichErrors.
-                CancelSaltTooLowError(minValidSalt, oldMinValidSalt)
-                    .rrevert();
-        }
-
-        stor.limitOrdersMakerToMakerTokenToTakerTokenToMinValidOrderSalt
-            [maker]
-            [address(makerToken)]
-            [address(takerToken)] = minValidSalt;
-
-        emit PairCancelledLimitOrders(
-            maker,
-            address(makerToken),
-            address(takerToken),
-            minValidSalt
-        );
-    }
 }

contracts/zero-ex/contracts/src/features/native_orders/NativeOrdersInfo.sol

@@ -51,10 +51,12 @@ abstract contract NativeOrdersInfo is
     uint256 private constant HIGH_BIT = 1 << 255;
 
     constructor(
-        address zeroExAddress
+        address zeroExAddress,
+        bytes32 greedyTokensBloomFilter
     )
         internal
         FixinEIP712(zeroExAddress)
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
         // solhint-disable no-empty-blocks
     }
@@ -168,10 +170,8 @@ abstract contract NativeOrdersInfo is
                 orderInfo: orderInfo
             })
         );
-        address signerOfHash = LibSignature.getSignerOfHash(orderInfo.orderHash, signature);
-        isSignatureValid =
-            (order.maker == signerOfHash) ||
-            isValidOrderSigner(order.maker, signerOfHash);
+        isSignatureValid = order.maker ==
+            LibSignature.getSignerOfHash(orderInfo.orderHash, signature);
     }
 
     /// @dev Get order info, fillable amount, and signature validity for an RFQ order.
@@ -204,10 +204,8 @@ abstract contract NativeOrdersInfo is
                 orderInfo: orderInfo
             })
         );
-        address signerOfHash = LibSignature.getSignerOfHash(orderInfo.orderHash, signature);
-        isSignatureValid =
-            (order.maker == signerOfHash) ||
-            isValidOrderSigner(order.maker, signerOfHash);
+        isSignatureValid = order.maker ==
+            LibSignature.getSignerOfHash(orderInfo.orderHash, signature);
     }
 
     /// @dev Batch version of `getLimitOrderRelevantState()`, without reverting.
@@ -393,22 +391,4 @@ abstract contract NativeOrdersInfo is
             uint256(params.orderTakerAmount)
         ).safeDowncastToUint128();
     }
-
-    /// @dev checks if a given address is registered to sign on behalf of a maker address
-    /// @param maker The maker address encoded in an order (can be a contract)
-    /// @param signer The address that is providing a signature
-    function isValidOrderSigner(
-        address maker,
-        address signer
-    )
-        public
-        view
-        returns (bool isValid)
-    {
-        // returns false if it the mapping doesn't exist
-        return LibNativeOrdersStorage.getStorage()
-            .orderSignerRegistry
-                [maker]
-                [signer];
-    }
 }

contracts/zero-ex/contracts/src/features/native_orders/NativeOrdersSettlement.sol

@@ -96,10 +96,11 @@ abstract contract NativeOrdersSettlement is
         IEtherTokenV06 weth,
         IStaking staking,
         FeeCollectorController feeCollectorController,
-        uint32 protocolFeeMultiplier
+        uint32 protocolFeeMultiplier,
+        bytes32 greedyTokensBloomFilter
     )
         public
-        NativeOrdersCancellation(zeroExAddress)
+        NativeOrdersCancellation(zeroExAddress, greedyTokensBloomFilter)
         NativeOrdersProtocolFees(weth, staking, feeCollectorController, protocolFeeMultiplier)
     {
         // solhint-disable no-empty-blocks
@@ -370,7 +371,7 @@ abstract contract NativeOrdersSettlement is
                 orderInfo.orderHash,
                 params.signature
             );
-            if (signer != params.order.maker && !isValidOrderSigner(params.order.maker, signer)) {
+            if (signer != params.order.maker) {
                 LibNativeOrdersRichErrors.OrderNotSignedByMakerError(
                     orderInfo.orderHash,
                     signer,
@@ -478,7 +479,7 @@ abstract contract NativeOrdersSettlement is
         // Signature must be valid for the order.
         {
             address signer = LibSignature.getSignerOfHash(orderInfo.orderHash, signature);
-            if (signer != order.maker && !isValidOrderSigner(order.maker, signer)) {
+            if (signer != order.maker) {
                 LibNativeOrdersRichErrors.OrderNotSignedByMakerError(
                     orderInfo.orderHash,
                     signer,
@@ -565,21 +566,4 @@ abstract contract NativeOrdersSettlement is
             makerTokenFilledAmount
         );
     }
-
-    /// @dev register a signer who can sign on behalf of msg.sender
-    /// @param signer The address from which you plan to generate signatures
-    /// @param allowed True to register, false to unregister.
-    function registerAllowedOrderSigner(
-        address signer,
-        bool allowed
-    )
-        external
-    {
-        LibNativeOrdersStorage.Storage storage stor =
-            LibNativeOrdersStorage.getStorage();
-
-        stor.orderSignerRegistry[msg.sender][signer] = allowed;
-
-        emit OrderSignerRegistered(msg.sender, signer, allowed);
-    }
 }

contracts/zero-ex/contracts/src/fixins/FixinTokenSpender.sol

@@ -22,13 +22,28 @@ pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
+import "../features/interfaces/ITokenSpenderFeature.sol";
+import "../errors/LibSpenderRichErrors.sol";
+import "../external/FeeCollector.sol";
+import "../vendor/v3/IStaking.sol";
+import "../vendor/v3/IStaking.sol";
 
 
 /// @dev Helpers for moving tokens around.
 abstract contract FixinTokenSpender {
+    using LibRichErrorsV06 for bytes;
 
     // Mask of the lower 20 bytes of a bytes32.
     uint256 constant private ADDRESS_MASK = 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
+    /// @dev A bloom filter for tokens that consume all gas when `transferFrom()` fails.
+    bytes32 public immutable GREEDY_TOKENS_BLOOM_FILTER;
+
+    /// @param greedyTokensBloomFilter The bloom filter for all greedy tokens.
+    constructor(bytes32 greedyTokensBloomFilter)
+        internal
+    {
+        GREEDY_TOKENS_BLOOM_FILTER = greedyTokensBloomFilter;
+    }
 
     /// @dev Transfers ERC20 tokens from `owner` to `to`.
     /// @param token The token to spend.
@@ -43,8 +58,29 @@ abstract contract FixinTokenSpender {
     )
         internal
     {
+        bool success;
+        bytes memory revertData;
+
         require(address(token) != address(this), "FixinTokenSpender/CANNOT_INVOKE_SELF");
 
+        // If the token eats all gas when failing, we do not want to perform
+        // optimistic fall through to the old AllowanceTarget contract if the
+        // direct transferFrom() fails.
+        if (_isTokenPossiblyGreedy(token)) {
+            // If the token does not have a direct allowance on us then we use
+            // the allowance target.
+            if (token.allowance(owner, address(this)) < amount) {
+                _transferFromLegacyAllowanceTarget(
+                    token,
+                    owner,
+                    to,
+                    amount,
+                    ""
+                );
+                return;
+            }
+        }
+
         assembly {
             let ptr := mload(0x40) // free memory pointer
 
@@ -54,18 +90,20 @@ abstract contract FixinTokenSpender {
             mstore(add(ptr, 0x24), and(to, ADDRESS_MASK))
             mstore(add(ptr, 0x44), amount)
 
-            let success := call(
+            success := call(
                 gas(),
                 and(token, ADDRESS_MASK),
                 0,
                 ptr,
                 0x64,
-                ptr,
-                32
+                0,
+                0
             )
 
             let rdsize := returndatasize()
 
+            returndatacopy(add(ptr, 0x20), 0, rdsize) // reuse memory
+
             // Check for ERC20 success. ERC20 tokens should return a boolean,
             // but some don't. We accept 0-length return data as success, or at
             // least 32 bytes that starts with a 32-byte boolean true.
@@ -75,16 +113,30 @@ abstract contract FixinTokenSpender {
                     iszero(rdsize),                  // no return data, or
                     and(
                         iszero(lt(rdsize, 32)),      // at least 32 bytes
-                        eq(mload(ptr), 1)            // starts with uint256(1)
+                        eq(mload(add(ptr, 0x20)), 1) // starts with uint256(1)
                     )
                 )
             )
 
             if iszero(success) {
-                returndatacopy(ptr, 0, rdsize)
-                revert(ptr, rdsize)
+                // revertData is a bytes, so length-prefixed data
+                mstore(ptr, rdsize)
+                revertData := ptr
+
+                // update free memory pointer (ptr + 32-byte length + return data)
+                mstore(0x40, add(add(ptr, 0x20), rdsize))
             }
         }
+
+        if (!success) {
+            _transferFromLegacyAllowanceTarget(
+                token,
+                owner,
+                to,
+                amount,
+                revertData
+            );
+        }
     }
 
     /// @dev Gets the maximum amount of an ERC20 token `token` that can be
@@ -105,4 +157,53 @@ abstract contract FixinTokenSpender {
             token.balanceOf(owner)
         );
     }
+
+    /// @dev Check if a token possibly belongs to the `GREEDY_TOKENS_BLOOM_FILTER`
+    ///      bloom filter.
+    function _isTokenPossiblyGreedy(IERC20TokenV06 token)
+        internal
+        view
+        returns (bool isPossiblyGreedy)
+    {
+        // The hash is given by:
+        // (1 << (keccak256(token) % 256)) | (1 << (token % 256))
+        bytes32 h;
+        assembly {
+            mstore(0, token)
+            h := or(shl(mod(keccak256(0, 32), 256), 1), shl(mod(token, 256), 1))
+        }
+        return (h & GREEDY_TOKENS_BLOOM_FILTER) == h;
+    }
+
+    /// @dev Transfer tokens using the legacy allowance target instead of
+    ///      allowances directly set on the exchange proxy.
+    function _transferFromLegacyAllowanceTarget(
+        IERC20TokenV06 token,
+        address owner,
+        address to,
+        uint256 amount,
+        bytes memory initialRevertData
+    )
+        private
+    {
+        // Try the old AllowanceTarget.
+        try ITokenSpenderFeature(address(this))._spendERC20Tokens(
+                token,
+                owner,
+                to,
+                amount
+            ) {
+        } catch (bytes memory revertData) {
+            // Bubble up the first error message. (In general, the fallback to the
+            // allowance target is opportunistic. We ignore the specific error
+            // message if it fails.)
+            LibSpenderRichErrors.SpenderERC20TransferFromFailedError(
+                address(token),
+                owner,
+                to,
+                amount,
+                initialRevertData.length != 0 ? initialRevertData : revertData
+            ).rrevert();
+        }
+    }
 }

contracts/zero-ex/contracts/src/migrations/FullMigration.sol

@@ -22,9 +22,11 @@ pragma experimental ABIEncoderV2;
 
 import "../ZeroEx.sol";
 import "../features/interfaces/IOwnableFeature.sol";
+import "../features/TokenSpenderFeature.sol";
 import "../features/TransformERC20Feature.sol";
 import "../features/MetaTransactionsFeature.sol";
 import "../features/NativeOrdersFeature.sol";
+import "../external/AllowanceTarget.sol";
 import "./InitialMigration.sol";
 
 
@@ -37,6 +39,7 @@ contract FullMigration {
     struct Features {
         SimpleFunctionRegistryFeature registry;
         OwnableFeature ownable;
+        TokenSpenderFeature tokenSpender;
         TransformERC20Feature transformERC20;
         MetaTransactionsFeature metaTransactions;
         NativeOrdersFeature nativeOrders;
@@ -104,7 +107,7 @@ contract FullMigration {
         );
 
         // Add features.
-        _addFeatures(zeroEx, features, migrateOpts);
+        _addFeatures(zeroEx, owner, features, migrateOpts);
 
         // Transfer ownership to the real owner.
         IOwnableFeature(address(zeroEx)).transferOwnership(owner);
@@ -129,16 +132,36 @@ contract FullMigration {
 
     /// @dev Deploy and register features to the ZeroEx contract.
     /// @param zeroEx The bootstrapped ZeroEx contract.
+    /// @param owner The ultimate owner of the ZeroEx contract.
     /// @param features Features to add to the proxy.
     /// @param migrateOpts Parameters needed to initialize features.
     function _addFeatures(
         ZeroEx zeroEx,
+        address owner,
         Features memory features,
         MigrateOpts memory migrateOpts
     )
         private
     {
         IOwnableFeature ownable = IOwnableFeature(address(zeroEx));
+        // TokenSpenderFeature
+        {
+            // Create the allowance target.
+            AllowanceTarget allowanceTarget = new AllowanceTarget();
+            // Let the ZeroEx contract use the allowance target.
+            allowanceTarget.addAuthorizedAddress(address(zeroEx));
+            // Transfer ownership of the allowance target to the (real) owner.
+            allowanceTarget.transferOwnership(owner);
+            // Register the feature.
+            ownable.migrate(
+                address(features.tokenSpender),
+                abi.encodeWithSelector(
+                    TokenSpenderFeature.migrate.selector,
+                    allowanceTarget
+                ),
+                address(this)
+            );
+        }
         // TransformERC20Feature
         {
             // Register the feature.

contracts/zero-ex/contracts/src/storage/LibNativeOrdersStorage.sol

@@ -43,9 +43,6 @@ library LibNativeOrdersStorage {
         // For a given order origin, which tx.origin addresses are allowed to
         // fill the order.
         mapping(address => mapping(address => bool)) originRegistry;
-        // For a given maker address, which addresses are allowed to
-        // sign on its behalf.
-        mapping(address => mapping(address => bool)) orderSignerRegistry;
     }
 
     /// @dev Get the storage bucket for this contract.

contracts/zero-ex/contracts/src/storage/LibTokenSpenderStorage.sol

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+import "./LibStorage.sol";
+import "../external/IAllowanceTarget.sol";
+
+
+/// @dev Storage helpers for the `TokenSpender` feature.
+library LibTokenSpenderStorage {
+
+    /// @dev Storage bucket for this feature.
+    struct Storage {
+        // Allowance target contract.
+        IAllowanceTarget allowanceTarget;
+    }
+
+    /// @dev Get the storage bucket for this contract.
+    function getStorage() internal pure returns (Storage storage stor) {
+        uint256 storageSlot = LibStorage.getStorageSlot(
+            LibStorage.StorageId.TokenSpender
+        );
+        // Dip into assembly to change the slot pointed to by the local
+        // variable `stor`.
+        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
+        assembly { stor_slot := storageSlot }
+    }
+}

contracts/zero-ex/contracts/src/transformers/bridges/BridgeAdapter.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 /*
 
-  Copyright 2021 ZeroEx Intl.
+  Copyright 2020 ZeroEx Intl.
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -21,7 +21,7 @@ pragma solidity ^0.6.5;
 pragma experimental ABIEncoderV2;
 
 import "./IBridgeAdapter.sol";
-import "./BridgeProtocols.sol";
+import "./BridgeSource.sol";
 import "./mixins/MixinBalancer.sol";
 import "./mixins/MixinBancor.sol";
 import "./mixins/MixinCoFiX.sol";
@@ -30,12 +30,11 @@ import "./mixins/MixinCryptoCom.sol";
 import "./mixins/MixinDodo.sol";
 import "./mixins/MixinDodoV2.sol";
 import "./mixins/MixinKyber.sol";
-import "./mixins/MixinMakerPSM.sol";
 import "./mixins/MixinMooniswap.sol";
 import "./mixins/MixinMStable.sol";
-import "./mixins/MixinNerve.sol";
 import "./mixins/MixinOasis.sol";
 import "./mixins/MixinShell.sol";
+import "./mixins/MixinSushiswap.sol";
 import "./mixins/MixinUniswap.sol";
 import "./mixins/MixinUniswapV2.sol";
 import "./mixins/MixinZeroExBridge.sol";
@@ -50,12 +49,11 @@ contract BridgeAdapter is
     MixinDodo,
     MixinDodoV2,
     MixinKyber,
-    MixinMakerPSM,
     MixinMooniswap,
     MixinMStable,
-    MixinNerve,
     MixinOasis,
     MixinShell,
+    MixinSushiswap,
     MixinUniswap,
     MixinUniswapV2,
     MixinZeroExBridge
@@ -70,12 +68,11 @@ contract BridgeAdapter is
         MixinDodo()
         MixinDodoV2()
         MixinKyber(weth)
-        MixinMakerPSM()
         MixinMooniswap(weth)
         MixinMStable()
-        MixinNerve()
         MixinOasis()
         MixinShell()
+        MixinSushiswap()
         MixinUniswap(weth)
         MixinUniswapV2()
         MixinZeroExBridge()
@@ -91,113 +88,109 @@ contract BridgeAdapter is
         override
         returns (uint256 boughtAmount)
     {
-        uint128 protocolId = uint128(uint256(order.source) >> 128);
-        if (protocolId == BridgeProtocols.CURVE) {
+        if (order.source == BridgeSource.CURVE ||
+            order.source == BridgeSource.SWERVE ||
+            order.source == BridgeSource.SNOWSWAP) {
             boughtAmount = _tradeCurve(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.UNISWAPV2) {
+        } else if (order.source == BridgeSource.SUSHISWAP) {
+            boughtAmount = _tradeSushiswap(
+                buyToken,
+                sellAmount,
+                order.bridgeData
+            );
+        } else if (order.source == BridgeSource.UNISWAPV2 ||
+                   order.source == BridgeSource.LINKSWAP) {
             boughtAmount = _tradeUniswapV2(
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.UNISWAP) {
+        } else if (order.source == BridgeSource.UNISWAP) {
             boughtAmount = _tradeUniswap(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.BALANCER) {
+        } else if (order.source == BridgeSource.BALANCER ||
+                   order.source == BridgeSource.CREAM) {
             boughtAmount = _tradeBalancer(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.KYBER) {
+        } else if (order.source == BridgeSource.KYBER) {
             boughtAmount = _tradeKyber(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.MAKERPSM) {
-            boughtAmount = _tradeMakerPsm(
-                sellToken,
-                buyToken,
-                sellAmount,
-                order.bridgeData
-            );
-        } else if (protocolId == BridgeProtocols.MOONISWAP) {
+        } else if (order.source == BridgeSource.MOONISWAP) {
             boughtAmount = _tradeMooniswap(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.MSTABLE) {
+        } else if (order.source == BridgeSource.MSTABLE) {
             boughtAmount = _tradeMStable(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.OASIS) {
+        } else if (order.source == BridgeSource.OASIS) {
             boughtAmount = _tradeOasis(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.SHELL) {
+        } else if (order.source == BridgeSource.SHELL) {
             boughtAmount = _tradeShell(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.DODO) {
+        } else if (order.source == BridgeSource.DODO) {
             boughtAmount = _tradeDodo(
                 sellToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.DODOV2) {
+        } else if (order.source == BridgeSource.DODOV2) {
             boughtAmount = _tradeDodoV2(
                 sellToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.CRYPTOCOM) {
+        } else if (order.source == BridgeSource.CRYPTOCOM) {
             boughtAmount = _tradeCryptoCom(
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.BANCOR) {
+        } else if (order.source == BridgeSource.BANCOR) {
             boughtAmount = _tradeBancor(
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.COFIX) {
+        } else if (order.source == BridgeSource.COFIX) {
             boughtAmount = _tradeCoFiX(
                 sellToken,
                 buyToken,
                 sellAmount,
                 order.bridgeData
             );
-        } else if (protocolId == BridgeProtocols.NERVE) {
-            boughtAmount = _tradeNerve(
-                sellToken,
-                sellAmount,
-                order.bridgeData
-            );
         } else {
             boughtAmount = _tradeZeroExBridge(
                 sellToken,

contracts/zero-ex/contracts/src/transformers/bridges/BridgeProtocols.sol

@@ -1,47 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-/*
-
-  Copyright 2021 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.6.5;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
-
-
-library BridgeProtocols {
-    // A incrementally increasing, append-only list of protocol IDs.
-    // We don't use an enum so solidity doesn't throw when we pass in a
-    // new protocol ID that hasn't been rolled up yet.
-    uint128 internal constant UNKNOWN     = 0;
-    uint128 internal constant CURVE       = 1;
-    uint128 internal constant UNISWAPV2   = 2;
-    uint128 internal constant UNISWAP     = 3;
-    uint128 internal constant BALANCER    = 4;
-    uint128 internal constant KYBER       = 5;
-    uint128 internal constant MOONISWAP   = 6;
-    uint128 internal constant MSTABLE     = 7;
-    uint128 internal constant OASIS       = 8;
-    uint128 internal constant SHELL       = 9;
-    uint128 internal constant DODO        = 10;
-    uint128 internal constant DODOV2      = 11;
-    uint128 internal constant CRYPTOCOM   = 12;
-    uint128 internal constant BANCOR      = 13;
-    uint128 internal constant COFIX       = 14;
-    uint128 internal constant NERVE       = 15;
-    uint128 internal constant MAKERPSM    = 16;
-}

contracts/zero-ex/contracts/src/transformers/bridges/BridgeSource.sol

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+
+library BridgeSource {
+    uint256 constant internal BALANCER = 0;
+    uint256 constant internal BANCOR = 1;
+    uint256 constant internal COFIX = 2;
+    uint256 constant internal CURVE = 3;
+    uint256 constant internal CREAM = 4;
+    uint256 constant internal CRYPTOCOM = 5;
+    uint256 constant internal DODO = 6;
+    uint256 constant internal KYBER = 7;
+    uint256 constant internal LIQUIDITYPROVIDER = 8;
+    uint256 constant internal MOONISWAP = 9;
+    uint256 constant internal MSTABLE = 10;
+    uint256 constant internal OASIS = 11;
+    uint256 constant internal SHELL = 12;
+    uint256 constant internal SNOWSWAP = 13;
+    uint256 constant internal SUSHISWAP = 14;
+    uint256 constant internal SWERVE = 15;
+    uint256 constant internal UNISWAP = 16;
+    uint256 constant internal UNISWAPV2 = 17;
+    uint256 constant internal DODOV2 = 18;
+    uint256 constant internal LINKSWAP = 19;
+    // New sources should be APPENDED to this list, taking the next highest
+    // integer value.
+}