Publish

- @0x/contracts-asset-proxy@3.7.13
 - @0x/contracts-broker@1.1.31
 - @0x/contracts-coordinator@3.1.32
 - @0x/contracts-dev-utils@1.3.30
 - @0x/contracts-erc1155@2.1.31
 - @0x/contracts-erc20@3.3.10
 - @0x/contracts-erc721@3.1.31
 - @0x/contracts-exchange-forwarder@4.2.32
 - @0x/contracts-exchange-libs@4.3.31
 - @0x/contracts-exchange@3.2.32
 - @0x/contracts-extensions@6.2.26
 - @0x/contracts-integrations@2.7.46
 - @0x/contracts-multisig@4.1.32
 - @0x/contracts-staking@2.0.39
 - @0x/contracts-test-utils@5.4.2
 - @0x/contracts-treasury@1.1.8
 - @0x/contracts-utils@4.7.10
 - @0x/contracts-zero-ex@0.24.1
 - @0x/asset-swapper@6.16.0
 - @0x/contract-addresses@6.3.0
 - @0x/contract-wrappers-test@12.2.47
 - @0x/contract-wrappers@13.16.3
 - @0x/migrations@8.0.8
 - @0x/order-utils@10.4.23
 - @0x/protocol-utils@1.6.2

.circleci/config.yml

@@ -1,25 +1,25 @@
-version: 2
+version: 2.1
 
 jobs:
     build:
-        resource_class: medium+
+        resource_class: xlarge
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         environment:
-            CONTRACTS_COMMIT_HASH: '9ed05f5'
+            NODE_OPTIONS: '--max-old-space-size=16384'
         working_directory: ~/repo
         steps:
             - checkout
             - run: echo 'export PATH=$HOME/CIRCLE_PROJECT_REPONAME/node_modules/.bin:$PATH' >> $BASH_ENV
             - run:
                   name: install-yarn
-                  command: npm install --force --global yarn@1.17.0
+                  command: npm install --force --global yarn@1.22.0
             - run:
                   name: yarn
                   command: yarn --frozen-lockfile --ignore-engines install || yarn --frozen-lockfile --ignore-engines install
             - setup_remote_docker
-            - run: yarn build:ci
-            - run: yarn build:ts
+            - run: yarn build:ci || yarn build:ci || yarn build:ci
+            - run: yarn build:ts || yarn build:ts || yarn build:ts
             - save_cache:
                   key: repo-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
@@ -31,57 +31,59 @@ jobs:
     test-exchange-ganache:
         resource_class: medium+
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-exchange
+            - run: yarn wsrun -p @0x/contracts-exchange -m --serial -c test:circleci
     test-integrations-ganache:
         resource_class: medium+
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-integrations
+            - run: yarn wsrun -p @0x/contracts-integrations -m --serial -c test:circleci
     test-contracts-staking-ganache:
         resource_class: medium+
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-staking
+            - run: yarn wsrun -p @0x/contracts-staking -m --serial -c test:circleci
     test-contracts-extra-ganache:
         resource_class: medium+
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-exchange-forwarder @0x/contracts-coordinator
+            - run: yarn wsrun -p @0x/contracts-exchange-forwarder -p @0x/contracts-coordinator -m --serial -c test:circleci
     test-contracts-rest-ganache:
         resource_class: medium+
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-multisig @0x/contracts-utils @0x/contracts-exchange-libs @0x/contracts-erc20 @0x/contracts-erc721 @0x/contracts-erc1155 @0x/contracts-asset-proxy @0x/contracts-broker @0x/contracts-zero-ex
+            - run: yarn wsrun -p @0x/contracts-multisig -p @0x/contracts-utils -p @0x/contracts-exchange-libs -p  @0x/contracts-erc20 -p @0x/contracts-erc721 -p @0x/contracts-erc1155 -p @0x/contracts-asset-proxy -p @0x/contracts-broker -p @0x/contracts-zero-ex -m --serial -c test:circleci
     test-publish:
-        resource_class: medium+
+        resource_class: large
+        environment:
+            NODE_OPTIONS: '--max-old-space-size=6442'
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
             - image: 0xorg/verdaccio
         working_directory: ~/repo
         steps:
@@ -95,7 +97,7 @@ jobs:
                   path: ~/.npm/_logs
     test-doc-generation:
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
@@ -106,18 +108,18 @@ jobs:
                   no_output_timeout: 1200
     test-rest:
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-test-utils
-            - run: yarn wsrun test:circleci @0x/contract-artifacts
-            - run: yarn wsrun test:circleci @0x/contract-wrappers-test
-            - run: yarn wsrun test:circleci @0x/migrations
-            - run: yarn wsrun test:circleci @0x/order-utils
-            - run: yarn wsrun test:circleci @0x/asset-swapper
+            - run: yarn wsrun -p @0x/contracts-test-utils -m --serial -c test:circleci
+            - run: yarn wsrun -p @0x/contract-artifacts -m --serial -c test:circleci
+            - run: yarn wsrun -p @0x/contract-wrappers-test -m --serial -c test:circleci
+            - run: yarn wsrun -p @0x/migrations -m --serial -c test:circleci
+            - run: yarn wsrun -p @0x/order-utils -m --serial -c test:circleci
+            - run: yarn wsrun -p @0x/asset-swapper -m --serial -c test:circleci
             - save_cache:
                   key: coverage-contract-wrappers-test-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
@@ -134,7 +136,7 @@ jobs:
         resource_class: large
         working_directory: ~/repo
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         steps:
             - restore_cache:
                   keys:
@@ -145,7 +147,7 @@ jobs:
             - run: yarn diff_md_docs:ci
     submit-coverage:
         docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs10
+            - image: node:12
         working_directory: ~/repo
         steps:
             - restore_cache:

contracts/asset-proxy/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "3.7.13",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "3.7.12",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "3.7.11",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "3.7.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "3.7.9",

contracts/asset-proxy/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.7.13 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v3.7.12 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v3.7.11 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v3.7.10 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v3.7.9 - _April 1, 2021_
 
     * Dependencies updated

contracts/asset-proxy/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-asset-proxy",
-    "version": "3.7.9",
+    "version": "3.7.13",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,15 +51,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contract-wrappers": "^13.15.0",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contract-wrappers": "^13.16.3",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
+        "@0x/tslint-config": "^4.1.4",
         "@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": "^5.1.1",
+        "ethereumjs-util": "^7.0.10",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -79,17 +79,17 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-erc1155": "^2.1.27",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/order-utils": "^10.4.19",
-        "@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",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-erc1155": "^2.1.31",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
+        "ethereum-types": "^3.5.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

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.sha3(trueAsBuffer));
+            const expectedResultHash = ethUtil.bufferToHex(ethUtil.keccak256(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.sha3(trueAsBuffer));
+            const expectedResultHash = ethUtil.bufferToHex(ethUtil.keccak256(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.sha3(ethUtil.toBuffer(encodedExpectedResultWithOffset)),
+                ethUtil.keccak256(ethUtil.toBuffer(encodedExpectedResultWithOffset)),
             );
             const assetData = assetDataInterface
                 .StaticCall(staticCallTarget.address, staticCallData, expectedResultHash)

contracts/broker/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "1.1.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "1.1.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "1.1.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "1.1.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "1.1.27",

contracts/broker/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.1.31 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v1.1.30 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v1.1.29 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v1.1.28 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v1.1.27 - _April 1, 2021_
 
     * Dependencies updated

contracts/broker/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-broker",
-    "version": "1.1.27",
+    "version": "1.1.31",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,20 +51,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -84,11 +84,11 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/utils": "^6.2.0",
-        "ethereum-types": "^3.4.0"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/coordinator/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "3.1.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "3.1.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "3.1.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "3.1.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "3.1.28",

contracts/coordinator/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.1.32 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v3.1.31 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v3.1.30 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v3.1.29 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v3.1.28 - _April 1, 2021_
 
     * Dependencies updated

contracts/coordinator/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-coordinator",
-    "version": "3.1.28",
+    "version": "3.1.32",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,17 +52,17 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/web3-wrapper": "^7.5.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -82,17 +82,17 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.21",
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@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",
+        "@0x/assert": "^3.0.27",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/json-schemas": "^6.1.3",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0",
         "http-status-codes": "^1.3.2"
     },
     "publishConfig": {

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

@@ -1,8 +1,4 @@
 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

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "1.3.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "1.3.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "1.3.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "1.3.27",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "1.3.26",

contracts/dev-utils/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.3.30 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v1.3.29 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v1.3.28 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v1.3.27 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v1.3.26 - _April 1, 2021_
 
     * Dependencies updated

contracts/dev-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-dev-utils",
-    "version": "1.3.26",
+    "version": "1.3.30",
     "engines": {
         "node": ">=6.12"
     },
@@ -41,18 +41,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/dev-utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/assert": "^3.0.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/assert": "^3.0.27",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/utils": "^6.2.0",
-        "ethereum-types": "^3.4.0",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0",
         "ethers": "~4.0.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -63,7 +63,7 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
+        "@0x/base-contract": "^6.4.0",
         "@types/node": "12.12.54"
     },
     "publishConfig": {

contracts/erc1155/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "2.1.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "2.1.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "2.1.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "2.1.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "2.1.27",

contracts/erc1155/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.1.31 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v2.1.30 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v2.1.29 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v2.1.28 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v2.1.27 - _April 1, 2021_
 
     * Dependencies updated

contracts/erc1155/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc1155",
-    "version": "2.1.27",
+    "version": "2.1.31",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/typescript-typings": "^5.1.6",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
         "@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": "^3.4.0",
+        "ethereum-types": "^3.5.0",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -80,10 +80,10 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/utils": "^6.2.0",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/erc20/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "3.3.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "3.3.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "3.3.8",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "3.3.7",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "3.3.6",

contracts/erc20/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.3.10 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v3.3.9 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v3.3.8 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v3.3.7 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v3.3.6 - _April 1, 2021_
 
     * Dependencies updated

contracts/erc20/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20",
-    "version": "3.3.6",
+    "version": "3.3.10",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,18 +51,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@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",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^3.4.0",
+        "ethereum-types": "^3.5.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -82,7 +82,7 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18"
+        "@0x/base-contract": "^6.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/erc721/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "3.1.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "3.1.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "3.1.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "3.1.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "3.1.27",

contracts/erc721/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.1.31 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v3.1.30 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v3.1.29 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v3.1.28 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v3.1.27 - _April 1, 2021_
 
     * Dependencies updated

contracts/erc721/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc721",
-    "version": "3.1.27",
+    "version": "3.1.31",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,18 +52,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@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",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^3.4.0",
+        "ethereum-types": "^3.5.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -84,7 +84,7 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18"
+        "@0x/base-contract": "^6.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-forwarder/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "4.2.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "4.2.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "4.2.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "4.2.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "4.2.28",

contracts/exchange-forwarder/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.2.32 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v4.2.31 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v4.2.30 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v4.2.29 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v4.2.28 - _April 1, 2021_
 
     * Dependencies updated

contracts/exchange-forwarder/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-forwarder",
-    "version": "4.2.28",
+    "version": "4.2.32",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,25 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-erc1155": "^2.1.27",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-erc1155": "^2.1.31",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/utils": "^6.2.0",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -90,9 +90,9 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/typescript-typings": "^5.1.6",
-        "ethereum-types": "^3.4.0"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/typescript-typings": "^5.2.0",
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-libs/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "4.3.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "4.3.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "4.3.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "4.3.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "4.3.27",

contracts/exchange-libs/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.3.31 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v4.3.30 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v4.3.29 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v4.3.28 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v4.3.27 - _April 1, 2021_
 
     * Dependencies updated

contracts/exchange-libs/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-libs",
-    "version": "4.3.27",
+    "version": "4.3.31",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,14 +52,14 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/libs",
     "devDependencies": {
-        "@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/abi-gen": "^5.6.0",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/subproviders": "^6.5.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^5.1.1",
+        "ethereumjs-util": "^7.0.10",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -80,14 +80,14 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/types": "^3.3.1",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/utils": "^6.2.0",
-        "ethereum-types": "^3.4.0"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "3.2.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "3.2.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "3.2.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "3.2.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "3.2.28",

contracts/exchange/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.2.32 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v3.2.31 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v3.2.30 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v3.2.29 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v3.2.28 - _April 1, 2021_
 
     * Dependencies updated

contracts/exchange/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange",
-    "version": "3.2.28",
+    "version": "3.2.32",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,21 +52,21 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-multisig": "^4.1.28",
-        "@0x/contracts-staking": "^2.0.35",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-multisig": "^4.1.32",
+        "@0x/contracts-staking": "^2.0.39",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^3.4.0",
-        "ethereumjs-util": "^5.1.1",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10",
         "js-combinatorics": "^0.5.3",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -88,13 +88,13 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-erc1155": "^2.1.27",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/utils": "^6.2.0",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-erc1155": "^2.1.31",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/utils": "^6.4.3",
         "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 => ethUtil.bufferToHex(ethUtil.sha3(ethUtil.toBuffer(bytesHex)));
+    const hashBytes = (bytesHex: string): string => hexUtils.hash(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/wrapper_unit_tests.ts

@@ -12,7 +12,6 @@ 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';
@@ -104,7 +103,7 @@ 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 ethjs.bufferToHex(ethjs.sha3(ethjs.toBuffer(orderHashUtils.getOrderHashHex(order))));
+        return hexUtils.hash(orderHashUtils.getOrderHashHex(order));
     }
 
     // Asserts that `_fillOrder()` was called in the same order and with the same

contracts/extensions/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "6.2.26",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "6.2.25",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "6.2.24",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "6.2.23",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "6.2.22",

contracts/extensions/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v6.2.26 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v6.2.25 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v6.2.24 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v6.2.23 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v6.2.22 - _April 1, 2021_
 
     * Dependencies updated

contracts/extensions/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-extensions",
-    "version": "6.2.22",
+    "version": "6.2.26",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,23 +52,23 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/utils": "^6.2.0",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^5.1.1",
+        "ethereumjs-util": "^7.0.10",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -90,10 +90,10 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/typescript-typings": "^5.1.6",
-        "ethereum-types": "^3.4.0"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/typescript-typings": "^5.2.0",
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/integrations/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-integrations",
-    "version": "2.7.36",
+    "version": "2.7.46",
     "private": true,
     "engines": {
         "node": ">=6.12"
@@ -52,25 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contract-wrappers": "^13.15.0",
-        "@0x/contracts-broker": "^1.1.27",
-        "@0x/contracts-coordinator": "^3.1.28",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-exchange-forwarder": "^4.2.28",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-extensions": "^6.2.22",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-utils": "^4.7.6",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/contract-wrappers": "^13.16.3",
+        "@0x/contracts-broker": "^1.1.31",
+        "@0x/contracts-coordinator": "^3.1.32",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-exchange-forwarder": "^4.2.32",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-extensions": "^6.2.26",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-utils": "^4.7.10",
         "@0x/coordinator-server": "^1.0.5",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/migrations": "^8.0.2",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/protocol-utils": "^1.5.0",
-        "@0x/sol-compiler": "^4.6.1",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/migrations": "^8.0.8",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/protocol-utils": "^1.6.2",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/web3-wrapper": "^7.5.3",
         "@azure/core-asynciterator-polyfill": "^1.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -93,23 +93,23 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/asset-swapper": "^6.7.0",
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-erc1155": "^2.1.27",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-erc721": "^3.1.27",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-multisig": "^4.1.28",
-        "@0x/contracts-staking": "^2.0.35",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-zero-ex": "^0.22.0",
-        "@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",
+        "@0x/asset-swapper": "^6.16.0",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-erc1155": "^2.1.31",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-erc721": "^3.1.31",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-multisig": "^4.1.32",
+        "@0x/contracts-staking": "^2.0.39",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-zero-ex": "^0.24.1",
+        "@0x/subproviders": "^6.5.3",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/multisig/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "4.1.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "4.1.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "4.1.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "4.1.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "4.1.28",

contracts/multisig/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.1.32 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v4.1.31 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v4.1.30 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v4.1.29 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v4.1.28 - _April 1, 2021_
 
     * Dependencies updated

contracts/multisig/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-multisig",
-    "version": "4.1.28",
+    "version": "4.1.32",
     "engines": {
         "node": ">=6.12"
     },
@@ -49,18 +49,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/multisig",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
-        "@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",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -78,9 +78,9 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/typescript-typings": "^5.1.6",
-        "ethereum-types": "^3.4.0"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/typescript-typings": "^5.2.0",
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/staking/CHANGELOG.json

@@ -1,4 +1,41 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "2.0.39",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "2.0.38",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "2.0.37",
+        "changes": [
+            {
+                "note": "Patch epoch finalization issue",
+                "pr": 221
+            }
+        ],
+        "timestamp": 1620214333
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "2.0.36",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "2.0.35",

contracts/staking/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.0.39 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v2.0.38 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v2.0.37 - _May 5, 2021_
+
+    * Patch epoch finalization issue (#221)
+
+## v2.0.36 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v2.0.35 - _April 1, 2021_
 
     * Dependencies updated

contracts/staking/contracts/src/StakingPatch.sol

@@ -0,0 +1,55 @@
+/*
+
+  Copyright 2019 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 ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "./interfaces/IStaking.sol";
+import "./sys/MixinParams.sol";
+import "./stake/MixinStake.sol";
+import "./fees/MixinExchangeFees.sol";
+
+
+contract StakingPatch is
+    IStaking,
+    MixinParams,
+    MixinStake,
+    MixinExchangeFees
+{
+    /// @dev Initialize storage owned by this contract.
+    ///      This function should not be called directly.
+    ///      The StakingProxy contract will call it in `attachStakingContract()`.
+    function init()
+        public
+        onlyAuthorized
+    {
+        uint256 currentEpoch_ = currentEpoch;
+        uint256 prevEpoch = currentEpoch_.safeSub(1);
+
+        // Patch corrupted state
+        aggregatedStatsByEpoch[prevEpoch].numPoolsToFinalize = 0;
+        this.endEpoch();
+
+        uint256 lastPoolId_ = 57;
+        for (uint256 i = 1; i <= lastPoolId_; i++) {
+            this.finalizePool(bytes32(i));
+        }
+        // Ensure that current epoch's state is not corrupted
+        aggregatedStatsByEpoch[currentEpoch_].numPoolsToFinalize = 0;
+    }
+}

contracts/staking/contracts/src/fees/MixinExchangeFees.sol

@@ -53,6 +53,10 @@ contract MixinExchangeFees is
     {
         _assertValidProtocolFee(protocolFee);
 
+        if (protocolFee == 0) {
+            return;
+        }
+
         // Transfer the protocol fee to this address if it should be paid in
         // WETH.
         if (msg.value == 0) {

contracts/staking/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-staking",
-    "version": "2.0.35",
+    "version": "2.0.39",
     "engines": {
         "node": ">=6.12"
     },
@@ -41,7 +41,7 @@
     "config": {
         "publicInterfaceContracts": "IStaking,IStakingEvents,IStakingProxy,IZrxVault,LibStakingRichErrors,Staking,StakingProxy,ZrxVault,TestStaking",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
-        "abis": "./test/generated-artifacts/@(IStaking|IStakingEvents|IStakingProxy|IStorage|IStorageInit|IStructs|IZrxVault|LibCobbDouglas|LibFixedMath|LibFixedMathRichErrors|LibSafeDowncast|LibStakingRichErrors|MixinAbstract|MixinConstants|MixinCumulativeRewards|MixinDeploymentConstants|MixinExchangeFees|MixinExchangeManager|MixinFinalizer|MixinParams|MixinScheduler|MixinStake|MixinStakeBalances|MixinStakeStorage|MixinStakingPool|MixinStakingPoolRewards|MixinStorage|Staking|StakingProxy|TestAssertStorageParams|TestCobbDouglas|TestCumulativeRewardTracking|TestDelegatorRewards|TestExchangeManager|TestFinalizer|TestInitTarget|TestLibFixedMath|TestLibSafeDowncast|TestMixinCumulativeRewards|TestMixinParams|TestMixinScheduler|TestMixinStake|TestMixinStakeBalances|TestMixinStakeStorage|TestMixinStakingPool|TestMixinStakingPoolRewards|TestProtocolFees|TestProxyDestination|TestStaking|TestStakingNoWETH|TestStakingProxy|TestStakingProxyUnit|TestStorageLayoutAndConstants|ZrxVault).json"
+        "abis": "./test/generated-artifacts/@(IStaking|IStakingEvents|IStakingProxy|IStorage|IStorageInit|IStructs|IZrxVault|LibCobbDouglas|LibFixedMath|LibFixedMathRichErrors|LibSafeDowncast|LibStakingRichErrors|MixinAbstract|MixinConstants|MixinCumulativeRewards|MixinDeploymentConstants|MixinExchangeFees|MixinExchangeManager|MixinFinalizer|MixinParams|MixinScheduler|MixinStake|MixinStakeBalances|MixinStakeStorage|MixinStakingPool|MixinStakingPoolRewards|MixinStorage|Staking|StakingPatch|StakingProxy|TestAssertStorageParams|TestCobbDouglas|TestCumulativeRewardTracking|TestDelegatorRewards|TestExchangeManager|TestFinalizer|TestInitTarget|TestLibFixedMath|TestLibSafeDowncast|TestMixinCumulativeRewards|TestMixinParams|TestMixinScheduler|TestMixinStake|TestMixinStakeBalances|TestMixinStakeStorage|TestMixinStakingPool|TestMixinStakingPoolRewards|TestProtocolFees|TestProxyDestination|TestStaking|TestStakingNoWETH|TestStakingProxy|TestStakingProxyUnit|TestStorageLayoutAndConstants|ZrxVault).json"
     },
     "repository": {
         "type": "git",
@@ -53,20 +53,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-dev-utils": "^1.3.26",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-utils": "^4.7.6",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-dev-utils": "^1.3.30",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-utils": "^4.7.10",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@types/lodash": "4.14.104",
         "@types/node": "12.12.54",
         "chai": "^4.0.1",
@@ -87,12 +87,12 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/utils": "^6.2.0",
-        "ethereum-types": "^3.4.0",
-        "ethereumjs-util": "^5.1.1"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10"
     },
     "publishConfig": {
         "access": "public"

contracts/staking/test/artifacts.ts

@@ -33,6 +33,7 @@ import * as MixinStakingPool from '../test/generated-artifacts/MixinStakingPool.
 import * as MixinStakingPoolRewards from '../test/generated-artifacts/MixinStakingPoolRewards.json';
 import * as MixinStorage from '../test/generated-artifacts/MixinStorage.json';
 import * as Staking from '../test/generated-artifacts/Staking.json';
+import * as StakingPatch from '../test/generated-artifacts/StakingPatch.json';
 import * as StakingProxy from '../test/generated-artifacts/StakingProxy.json';
 import * as TestAssertStorageParams from '../test/generated-artifacts/TestAssertStorageParams.json';
 import * as TestCobbDouglas from '../test/generated-artifacts/TestCobbDouglas.json';
@@ -61,6 +62,7 @@ import * as TestStorageLayoutAndConstants from '../test/generated-artifacts/Test
 import * as ZrxVault from '../test/generated-artifacts/ZrxVault.json';
 export const artifacts = {
     Staking: Staking as ContractArtifact,
+    StakingPatch: StakingPatch as ContractArtifact,
     StakingProxy: StakingProxy as ContractArtifact,
     ZrxVault: ZrxVault as ContractArtifact,
     MixinExchangeFees: MixinExchangeFees as ContractArtifact,

contracts/staking/test/patch_mainnet_test.ts

@@ -0,0 +1,66 @@
+import { blockchainTests, constants, expect, filterLogsToArguments } from '@0x/contracts-test-utils';
+import { BigNumber, logUtils } from '@0x/utils';
+import * as _ from 'lodash';
+
+import { artifacts } from './artifacts';
+import { StakingEvents, StakingPatchContract, StakingProxyContract, StakingProxyEvents } from './wrappers';
+
+const abis = _.mapValues(artifacts, v => v.compilerOutput.abi);
+const STAKING_PROXY = '0xa26e80e7dea86279c6d778d702cc413e6cffa777';
+const STAKING_OWNER = '0x7d3455421bbc5ed534a83c88fd80387dc8271392';
+const EXCHANGE_PROXY = '0xdef1c0ded9bec7f1a1670819833240f027b25eff';
+blockchainTests.configure({
+    fork: {
+        unlockedAccounts: [STAKING_OWNER, EXCHANGE_PROXY],
+    },
+});
+
+blockchainTests.fork('Staking patch mainnet fork tests', env => {
+    let stakingProxyContract: StakingProxyContract;
+    let patchedStakingPatchContract: StakingPatchContract;
+
+    before(async () => {
+        stakingProxyContract = new StakingProxyContract(STAKING_PROXY, env.provider, undefined, abis);
+        patchedStakingPatchContract = await StakingPatchContract.deployFrom0xArtifactAsync(
+            artifacts.Staking,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+    });
+
+    it('Staking proxy successfully attaches to patched logic', async () => {
+        const tx = await stakingProxyContract
+            .attachStakingContract(patchedStakingPatchContract.address)
+            .awaitTransactionSuccessAsync({ from: STAKING_OWNER, gasPrice: 0 }, { shouldValidate: false });
+        expect(filterLogsToArguments(tx.logs, StakingProxyEvents.StakingContractAttachedToProxy)).to.deep.equal([
+            {
+                newStakingPatchContractAddress: patchedStakingPatchContract.address,
+            },
+        ]);
+        expect(filterLogsToArguments(tx.logs, StakingEvents.EpochEnded).length).to.equal(1);
+        expect(filterLogsToArguments(tx.logs, StakingEvents.EpochFinalized).length).to.equal(1);
+        logUtils.log(`${tx.gasUsed} gas used`);
+    });
+
+    it('Patched staking handles 0 gas protocol fees', async () => {
+        const staking = new StakingPatchContract(STAKING_PROXY, env.provider, undefined, abis);
+        const maker = '0x7b1886e49ab5433bb46f7258548092dc8cdca28b';
+        const zeroFeeTx = await staking
+            .payProtocolFee(maker, constants.NULL_ADDRESS, constants.ZERO_AMOUNT)
+            .awaitTransactionSuccessAsync({ from: EXCHANGE_PROXY, gasPrice: 0 }, { shouldValidate: false });
+        // StakingPoolEarnedRewardsInEpoch should _not_ be emitted for a zero protocol fee.
+        // tslint:disable-next-line:no-unused-expression
+        expect(filterLogsToArguments(zeroFeeTx.logs, StakingEvents.StakingPoolEarnedRewardsInEpoch)).to.be.empty;
+
+        // Coincidentally there's some ETH in the ExchangeProxy
+        const nonZeroFeeTx = await staking
+            .payProtocolFee(maker, constants.NULL_ADDRESS, new BigNumber(1))
+            .awaitTransactionSuccessAsync({ from: EXCHANGE_PROXY, gasPrice: 0, value: 1 }, { shouldValidate: false });
+        // StakingPoolEarnedRewardsInEpoch _should_ be emitted for a non-zero protocol fee.
+        expect(
+            filterLogsToArguments(nonZeroFeeTx.logs, StakingEvents.StakingPoolEarnedRewardsInEpoch),
+        ).to.have.lengthOf(1);
+    });
+});
+// tslint:enable:no-unnecessary-type-assertion

contracts/staking/test/wrappers.ts

@@ -31,6 +31,7 @@ export * from '../test/generated-wrappers/mixin_staking_pool';
 export * from '../test/generated-wrappers/mixin_staking_pool_rewards';
 export * from '../test/generated-wrappers/mixin_storage';
 export * from '../test/generated-wrappers/staking';
+export * from '../test/generated-wrappers/staking_patch';
 export * from '../test/generated-wrappers/staking_proxy';
 export * from '../test/generated-wrappers/test_assert_storage_params';
 export * from '../test/generated-wrappers/test_cobb_douglas';

contracts/staking/tsconfig.json

@@ -40,6 +40,7 @@
         "test/generated-artifacts/MixinStakingPoolRewards.json",
         "test/generated-artifacts/MixinStorage.json",
         "test/generated-artifacts/Staking.json",
+        "test/generated-artifacts/StakingPatch.json",
         "test/generated-artifacts/StakingProxy.json",
         "test/generated-artifacts/TestAssertStorageParams.json",
         "test/generated-artifacts/TestCobbDouglas.json",

contracts/test-utils/CHANGELOG.json

@@ -1,4 +1,41 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "5.4.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "5.4.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "5.4.0",
+        "changes": [
+            {
+                "note": "Set default ganache gas limit to 100e6",
+                "pr": 197
+            }
+        ],
+        "timestamp": 1620214333
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "5.3.25",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "5.3.24",

contracts/test-utils/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v5.4.2 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v5.4.1 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v5.4.0 - _May 5, 2021_
+
+    * Set default ganache gas limit to 100e6 (#197)
+
+## v5.3.25 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v5.3.24 - _April 1, 2021_
 
     * Dependencies updated

contracts/test-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-test-utils",
-    "version": "5.3.24",
+    "version": "5.4.2",
     "engines": {
         "node": ">=6.12"
     },
@@ -34,28 +34,28 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/test-utils",
     "devDependencies": {
-        "@0x/sol-compiler": "^4.6.1",
-        "@0x/tslint-config": "^4.1.3",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/tslint-config": "^4.1.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
         "tslint": "5.11.0",
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.21",
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/json-schemas": "^5.4.1",
-        "@0x/order-utils": "^10.4.19",
-        "@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",
+        "@0x/assert": "^3.0.27",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/json-schemas": "^6.1.3",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-coverage": "^4.0.37",
+        "@0x/sol-profiler": "^4.1.27",
+        "@0x/sol-trace": "^3.0.37",
+        "@0x/subproviders": "^6.5.3",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^3.4.0",
-        "ethereumjs-util": "^5.1.1",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10",
         "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.addHexPrefix(ethUtil.bufferToHex(ethUtil.SHA3_NULL)),
+    KECCAK256_NULL: ethUtil.bufferToHex(ethUtil.keccak256(Buffer.alloc(0))),
     MAX_UINT256_ROOT: new BigNumber('340282366920938463463374607431768211456'),
     ONE_ETHER: new BigNumber(1e18),
     EIP712_DOMAIN_NAME: '0x Protocol',

contracts/test-utils/src/web3_wrapper.ts

@@ -20,6 +20,7 @@ export let providerConfigs: Web3Config = {
     shouldUseInProcessGanache: true,
     shouldAllowUnlimitedContractSize: true,
     hardfork: 'istanbul',
+    gasLimit: 100e6,
     unlocked_accounts: [
         '0x6cc5f688a315f3dc28a7781717a9a798a59fda7b',
         '0x55dc8f21d20d4c6ed3c82916a438a413ca68e335',

contracts/test-utils/test/order_hash_test.ts

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

contracts/treasury/CHANGELOG.json

@@ -1,4 +1,50 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "1.1.8",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "1.1.7",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "1.1.6",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "1.1.5",
+        "changes": [
+            {
+                "note": "Patched votingPower logic",
+                "pr": 214
+            }
+        ],
+        "timestamp": 1619825976
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "1.1.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1619481586,
         "version": "1.1.3",

contracts/treasury/CHANGELOG.md

@@ -5,6 +5,26 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.1.8 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v1.1.7 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v1.1.6 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v1.1.5 - _April 30, 2021_
+
+    * Patched votingPower logic (#214)
+
+## v1.1.4 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v1.1.3 - _April 26, 2021_
 
     * Dependencies updated

contracts/treasury/contracts/src/IZrxTreasury.sol

@@ -30,6 +30,7 @@ interface IZrxTreasury {
         uint256 votingPeriod;
         uint256 proposalThreshold;
         uint256 quorumThreshold;
+        bytes32 defaultPoolId;
     }
 
     struct ProposedAction {

contracts/treasury/contracts/src/ZrxTreasury.sol

@@ -20,8 +20,6 @@
 pragma solidity ^0.6.12;
 pragma experimental ABIEncoderV2;
 
-import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
-import "@0x/contracts-erc20/contracts/src/v06/LibERC20TokenV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
@@ -32,7 +30,6 @@ import "./IZrxTreasury.sol";
 contract ZrxTreasury is
     IZrxTreasury
 {
-    using LibERC20TokenV06 for IERC20TokenV06;
     using LibSafeMathV06 for uint256;
     using LibRichErrorsV06 for bytes;
     using LibBytesV06 for bytes;
@@ -52,11 +49,9 @@ contract ZrxTreasury is
     /// @dev Initializes the ZRX treasury and creates the default
     ///      staking pool.
     /// @param stakingProxy_ The 0x staking proxy contract.
-    /// @param weth_ The WETH token contract.
     /// @param params Immutable treasury parameters.
     constructor(
         IStaking stakingProxy_,
-        IERC20TokenV06 weth_,
         TreasuryParameters memory params
     )
         public
@@ -66,15 +61,12 @@ contract ZrxTreasury is
             "VOTING_PERIOD_TOO_LONG"
         );
         stakingProxy = stakingProxy_;
-        DefaultPoolOperator defaultPoolOperator_ = new DefaultPoolOperator(
-            stakingProxy_,
-            weth_
-        );
-        defaultPoolOperator = defaultPoolOperator_;
-        defaultPoolId = defaultPoolOperator_.poolId();
         votingPeriod = params.votingPeriod;
         proposalThreshold = params.proposalThreshold;
         quorumThreshold = params.quorumThreshold;
+        defaultPoolId = params.defaultPoolId;
+        IStaking.Pool memory defaultPool = stakingProxy_.getStakingPool(params.defaultPoolId);
+        defaultPoolOperator = DefaultPoolOperator(defaultPool.operator);
     }
 
     // solhint-disable
@@ -286,6 +278,12 @@ contract ZrxTreasury is
 
         // Add voting power for operated staking pools.
         for (uint256 i = 0; i != operatedPoolIds.length; i++) {
+            for (uint256 j = 0; j != i; j++) {
+                require(
+                    operatedPoolIds[i] != operatedPoolIds[j],
+                    "getVotingPower/DUPLICATE_POOL_ID"
+                );
+            }
             IStaking.Pool memory pool = stakingProxy.getStakingPool(operatedPoolIds[i]);
             require(
                 pool.operator == account,

contracts/treasury/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-treasury",
-    "version": "1.1.3",
+    "version": "1.1.8",
     "engines": {
         "node": ">=6.12"
     },
@@ -46,16 +46,16 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/treasury",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-staking": "^2.0.35",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-staking": "^2.0.39",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
+        "@0x/tslint-config": "^4.1.4",
         "@types/isomorphic-fetch": "^0.0.35",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -72,15 +72,15 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/protocol-utils": "^1.5.0",
-        "@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"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/protocol-utils": "^1.6.2",
+        "@0x/subproviders": "^6.5.3",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10"
     },
     "publishConfig": {
         "access": "public"

contracts/treasury/test/treasury_test.ts

@@ -28,6 +28,7 @@ blockchainTests.resets('Treasury governance', env => {
         votingPeriod: new BigNumber(3).times(stakingConstants.ONE_DAY_IN_SECONDS),
         proposalThreshold: new BigNumber(100),
         quorumThreshold: new BigNumber(1000),
+        defaultPoolId: stakingConstants.INITIAL_POOL_ID,
     };
     const PROPOSAL_DESCRIPTION = 'A very compelling proposal!';
     const TREASURY_BALANCE = constants.INITIAL_ERC20_BALANCE;
@@ -135,6 +136,16 @@ blockchainTests.resets('Treasury governance', env => {
             .approve(erc20ProxyContract.address, constants.INITIAL_ERC20_ALLOWANCE)
             .awaitTransactionSuccessAsync({ from: delegator });
 
+        defaultPoolOperator = await DefaultPoolOperatorContract.deployFrom0xArtifactAsync(
+            artifacts.DefaultPoolOperator,
+            env.provider,
+            env.txDefaults,
+            { ...artifacts, ...erc20Artifacts },
+            staking.address,
+            weth.address,
+        );
+        defaultPoolId = stakingConstants.INITIAL_POOL_ID;
+
         const createStakingPoolTx = staking.createStakingPool(stakingConstants.PPM, false);
         nonDefaultPoolId = await createStakingPoolTx.callAsync({ from: poolOperator });
         await createStakingPoolTx.awaitTransactionSuccessAsync({ from: poolOperator });
@@ -145,9 +156,9 @@ blockchainTests.resets('Treasury governance', env => {
             env.txDefaults,
             { ...artifacts, ...erc20Artifacts },
             staking.address,
-            weth.address,
             TREASURY_PARAMS,
         );
+
         await zrx.mint(TREASURY_BALANCE).awaitTransactionSuccessAsync();
         await zrx.transfer(treasury.address, TREASURY_BALANCE).awaitTransactionSuccessAsync();
         actions = [
@@ -166,10 +177,6 @@ blockchainTests.resets('Treasury governance', env => {
                 value: constants.ZERO_AMOUNT,
             },
         ];
-
-        defaultPoolId = await treasury.defaultPoolId().callAsync();
-        const defaultPoolOperatorAddress = await treasury.defaultPoolOperator().callAsync();
-        defaultPoolOperator = new DefaultPoolOperatorContract(defaultPoolOperatorAddress, env.provider, env.txDefaults);
     });
     describe('getVotingPower()', () => {
         it('Unstaked ZRX has no voting power', async () => {
@@ -222,6 +229,19 @@ blockchainTests.resets('Treasury governance', env => {
             const operatorVotingPower = await treasury.getVotingPower(poolOperator, [nonDefaultPoolId]).callAsync();
             expect(operatorVotingPower).to.bignumber.equal(TREASURY_PARAMS.proposalThreshold.dividedBy(2));
         });
+        it('Reverts if given duplicate pool IDs', async () => {
+            await staking.stake(TREASURY_PARAMS.proposalThreshold).awaitTransactionSuccessAsync({ from: delegator });
+            await staking
+                .moveStake(
+                    new StakeInfo(StakeStatus.Undelegated),
+                    new StakeInfo(StakeStatus.Delegated, nonDefaultPoolId),
+                    TREASURY_PARAMS.proposalThreshold,
+                )
+                .awaitTransactionSuccessAsync({ from: delegator });
+            await fastForwardToNextEpochAsync();
+            const tx = treasury.getVotingPower(poolOperator, [nonDefaultPoolId, nonDefaultPoolId]).callAsync();
+            return expect(tx).to.revertWith('getVotingPower/DUPLICATE_POOL_ID');
+        });
         it('Correctly sums voting power delegated to multiple pools', async () => {
             await staking
                 .stake(TREASURY_PARAMS.proposalThreshold.times(2))

contracts/utils/CHANGELOG.json

@@ -1,4 +1,40 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "4.7.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1621600614,
+        "version": "4.7.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1620214333,
+        "version": "4.7.8",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619596077,
+        "version": "4.7.7",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1617311315,
         "version": "4.7.6",

contracts/utils/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.7.10 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v4.7.9 - _May 21, 2021_
+
+    * Dependencies updated
+
+## v4.7.8 - _May 5, 2021_
+
+    * Dependencies updated
+
+## v4.7.7 - _April 28, 2021_
+
+    * Dependencies updated
+
 ## v4.7.6 - _April 1, 2021_
 
     * Dependencies updated

contracts/utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-utils",
-    "version": "4.7.6",
+    "version": "4.7.10",
     "engines": {
         "node": ">=6.12"
     },
@@ -50,15 +50,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@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": "^5.1.1",
+        "ethereumjs-util": "^7.0.10",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -79,11 +79,11 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/utils": "^6.2.0",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
         "bn.js": "^4.11.8",
-        "ethereum-types": "^3.4.0"
+        "ethereum-types": "^3.5.0"
     },
     "publishConfig": {
         "access": "public"

contracts/utils/test/lib_eip712.ts

@@ -2,7 +2,6 @@ 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';
@@ -78,7 +77,7 @@ describe('LibEIP712', () => {
 
         // Hash the provided input to get the expected hash
         const input = '0x1901'.concat(unprefixedDomainHash.concat(unprefixedHashStruct));
-        const expectedHash = '0x'.concat(ethUtil.sha3(input).toString('hex'));
+        const expectedHash = hexUtils.hash(input);
 
         // Get the actual hash by calling the smart contract
         const actualHash = await lib.externalHashEIP712Message(domainHash, hashStruct).callAsync();

contracts/zero-ex/CHANGELOG.json

@@ -1,4 +1,65 @@
 [
+    {
+        "timestamp": 1621944788,
+        "version": "0.24.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "0.24.0",
+        "changes": [
+            {
+                "note": "Add special selectors to selector collision test",
+                "pr": 243
+            }
+        ],
+        "timestamp": 1621600614
+    },
+    {
+        "version": "0.23.0",
+        "changes": [
+            {
+                "note": "Added ETH support to `MixinCurve`",
+                "pr": 220
+            },
+            {
+                "note": "Add Balancer V2 integration",
+                "pr": 206
+            }
+        ],
+        "timestamp": 1620214333
+    },
+    {
+        "timestamp": 1619830995,
+        "version": "0.22.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1619825976,
+        "version": "0.22.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "0.22.1",
+        "changes": [
+            {
+                "note": "bump feature version to 1.2",
+                "pr": 213
+            }
+        ],
+        "timestamp": 1619596077
+    },
     {
         "version": "0.22.0",
         "changes": [
@@ -15,6 +76,10 @@
         "changes": [
             {
                 "note": "Dependencies updated"
+            },
+            {
+                "note": "BSC Uniswap clones (ApeSwap, CafeSwap, CheeseSwap, JulSwap)",
+                "pr": 208
             }
         ]
     },

contracts/zero-ex/CHANGELOG.md

@@ -5,6 +5,31 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v0.24.1 - _May 25, 2021_
+
+    * Dependencies updated
+
+## v0.24.0 - _May 21, 2021_
+
+    * Add special selectors to selector collision test (#243)
+
+## v0.23.0 - _May 5, 2021_
+
+    * Added ETH support to `MixinCurve` (#220)
+    * Add Balancer V2 integration (#206)
+
+## v0.22.3 - _May 1, 2021_
+
+    * Dependencies updated
+
+## v0.22.2 - _April 30, 2021_
+
+    * Dependencies updated
+
+## 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)
@@ -12,6 +37,7 @@ CHANGELOG
 ## v0.21.1 - _April 12, 2021_
 
     * Dependencies updated
+    * BSC Uniswap clones (ApeSwap, CafeSwap, CheeseSwap, JulSwap) (#208)
 
 ## v0.21.0 - _April 1, 2021_
 

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

@@ -34,7 +34,7 @@ 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, 1, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 2, 0);
 
     constructor(
         address zeroExAddress,

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

@@ -37,22 +37,44 @@ contract PancakeSwapFeature is
     /// @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);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 2);
     /// @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 PancakeSwapV2 factory contract.
+    uint256 constant private FF_PANCAKESWAPV2_FACTORY = 0xffca143ce32fe78f1f7019d7d551a6402fc5350c730000000000000000000000;
     // 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;
+    // 0xFF + address of the ApeSwap factory contract.
+    uint256 constant private FF_APESWAP_FACTORY = 0xff0841bd0b734e4f5853f0dd8d7ea041c241fb0da60000000000000000000000;
+    // 0xFF + address of the CafeSwap factory contract.
+    uint256 constant private FF_CAFESWAP_FACTORY = 0xff3e708fdbe3ada63fc94f8f61811196f1302137ad0000000000000000000000;
+    // 0xFF + address of the CheeseSwap factory contract.
+    uint256 constant private FF_CHEESESWAP_FACTORY = 0xffdd538e4fd1b69b7863e1f741213276a6cf1efb3b0000000000000000000000;
+    // 0xFF + address of the JulSwap factory contract.
+    uint256 constant private FF_JULSWAP_FACTORY = 0xff553990f2cba90272390f62c5bdb1681ffc8996750000000000000000000000;
+
     // Init code hash of the PancakeSwap pair contract.
     uint256 constant private PANCAKESWAP_PAIR_INIT_CODE_HASH = 0xd0d4c4cd0848c93cb4fd1f498d7013ee6bfb25783ea21593d5834f5d250ece66;
+    // Init code hash of the PancakeSwapV2 pair contract.
+    uint256 constant private PANCAKESWAPV2_PAIR_INIT_CODE_HASH = 0x00fb7f630766e6a796048ea87d01acd3068e8ff67d078148a3fa3f4a84f69bd5;
     // 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;
+    // Init code hash of the ApeSwap pair contract.
+    uint256 constant private APESWAP_PAIR_INIT_CODE_HASH = 0xf4ccce374816856d11f00e4069e7cada164065686fbef53c6167a63ec2fd8c5b;
+    // Init code hash of the CafeSwap pair contract.
+    uint256 constant private CAFESWAP_PAIR_INIT_CODE_HASH = 0x90bcdb5d0bf0e8db3852b0b7d7e05cc8f7c6eb6d511213c5ba02d1d1dbeda8d3;
+    // Init code hash of the CheeseSwap pair contract.
+    uint256 constant private CHEESESWAP_PAIR_INIT_CODE_HASH = 0xf52c5189a89e7ca2ef4f19f2798e3900fba7a316de7cef6c5a9446621ba86286;
+    // Init code hash of the JulSwap pair contract.
+    uint256 constant private JULSWAP_PAIR_INIT_CODE_HASH = 0xb1e98e21a5335633815a8cfb3b580071c2e4561c50afd57a8746def9ed890b18;
+
     // Mask of the lower 20 bytes of a bytes32.
     uint256 constant private ADDRESS_MASK = 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
     // BNB pseudo-token address.
@@ -258,7 +280,7 @@ contract PancakeSwapFeature is
 
                 // Call pair.swap()
                 switch mload(0xA20) // fork
-                    case 1 {
+                    case 2 {
                         mstore(0xB00, BAKERYSWAP_PAIR_SWAP_CALL_SELECTOR_32)
                     }
                     default {
@@ -352,15 +374,40 @@ contract PancakeSwapFeature is
                         mstore(0xB35, PANCAKESWAP_PAIR_INIT_CODE_HASH)
                     }
                     case 1 {
+                        mstore(0xB00, FF_PANCAKESWAPV2_FACTORY)
+                        mstore(0xB15, salt)
+                        mstore(0xB35, PANCAKESWAPV2_PAIR_INIT_CODE_HASH)
+                    }
+                    case 2 {
                         mstore(0xB00, FF_BAKERYSWAP_FACTORY)
                         mstore(0xB15, salt)
                         mstore(0xB35, BAKERYSWAP_PAIR_INIT_CODE_HASH)
                     }
-                    default {
+                    case 3 {
                         mstore(0xB00, FF_SUSHISWAP_FACTORY)
                         mstore(0xB15, salt)
                         mstore(0xB35, SUSHISWAP_PAIR_INIT_CODE_HASH)
                     }
+                    case 4 {
+                        mstore(0xB00, FF_APESWAP_FACTORY)
+                        mstore(0xB15, salt)
+                        mstore(0xB35, APESWAP_PAIR_INIT_CODE_HASH)
+                    }
+                    case 5 {
+                        mstore(0xB00, FF_CAFESWAP_FACTORY)
+                        mstore(0xB15, salt)
+                        mstore(0xB35, CAFESWAP_PAIR_INIT_CODE_HASH)
+                    }
+                    case 6 {
+                        mstore(0xB00, FF_CHEESESWAP_FACTORY)
+                        mstore(0xB15, salt)
+                        mstore(0xB35, CHEESESWAP_PAIR_INIT_CODE_HASH)
+                    }
+                    default {
+                        mstore(0xB00, FF_JULSWAP_FACTORY)
+                        mstore(0xB15, salt)
+                        mstore(0xB35, JULSWAP_PAIR_INIT_CODE_HASH)
+                    }
                 pair := and(ADDRESS_MASK, keccak256(0xB00, 0x55))
             }
 

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

@@ -23,16 +23,21 @@ pragma experimental ABIEncoderV2;
 import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
 
 
-/// @dev VIP PancakeSwap/BakerySwap/SushiSwap fill functions.
+/// @dev VIP PancakeSwap (and forks) fill functions.
 interface IPancakeSwapFeature {
 
     enum ProtocolFork {
         PancakeSwap,
+        PancakeSwapV2,
         BakerySwap,
-        SushiSwap
+        SushiSwap,
+        ApeSwap,
+        CafeSwap,
+        CheeseSwap,
+        JulSwap
     }
 
-    /// @dev Efficiently sell directly to PancakeSwap/BakerySwap/Sushiswap.
+    /// @dev Efficiently sell directly to PancakeSwap (and forks).
     /// @param tokens Sell path.
     /// @param sellAmount of `tokens[0]` Amount to sell.
     /// @param minBuyAmount Minimum amount of `tokens[-1]` to buy.

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

@@ -23,6 +23,7 @@ pragma experimental ABIEncoderV2;
 import "./IBridgeAdapter.sol";
 import "./BridgeProtocols.sol";
 import "./mixins/MixinBalancer.sol";
+import "./mixins/MixinBalancerV2.sol";
 import "./mixins/MixinBancor.sol";
 import "./mixins/MixinCoFiX.sol";
 import "./mixins/MixinCurve.sol";
@@ -30,6 +31,7 @@ import "./mixins/MixinCryptoCom.sol";
 import "./mixins/MixinDodo.sol";
 import "./mixins/MixinDodoV2.sol";
 import "./mixins/MixinKyber.sol";
+import "./mixins/MixinKyberDmm.sol";
 import "./mixins/MixinMakerPSM.sol";
 import "./mixins/MixinMooniswap.sol";
 import "./mixins/MixinMStable.sol";
@@ -38,11 +40,13 @@ import "./mixins/MixinOasis.sol";
 import "./mixins/MixinShell.sol";
 import "./mixins/MixinUniswap.sol";
 import "./mixins/MixinUniswapV2.sol";
+import "./mixins/MixinUniswapV3.sol";
 import "./mixins/MixinZeroExBridge.sol";
 
 contract BridgeAdapter is
     IBridgeAdapter,
     MixinBalancer,
+    MixinBalancerV2,
     MixinBancor,
     MixinCoFiX,
     MixinCurve,
@@ -50,6 +54,7 @@ contract BridgeAdapter is
     MixinDodo,
     MixinDodoV2,
     MixinKyber,
+    MixinKyberDmm,
     MixinMakerPSM,
     MixinMooniswap,
     MixinMStable,
@@ -58,14 +63,16 @@ contract BridgeAdapter is
     MixinShell,
     MixinUniswap,
     MixinUniswapV2,
+    MixinUniswapV3,
     MixinZeroExBridge
 {
     constructor(IEtherTokenV06 weth)
         public
         MixinBalancer()
+        MixinBalancerV2()
         MixinBancor(weth)
         MixinCoFiX()
-        MixinCurve()
+        MixinCurve(weth)
         MixinCryptoCom()
         MixinDodo()
         MixinDodoV2()
@@ -78,6 +85,7 @@ contract BridgeAdapter is
         MixinShell()
         MixinUniswap(weth)
         MixinUniswapV2()
+        MixinUniswapV3()
         MixinZeroExBridge()
     {}
 
@@ -99,6 +107,12 @@ contract BridgeAdapter is
                 sellAmount,
                 order.bridgeData
             );
+        } else if (protocolId == BridgeProtocols.UNISWAPV3) {
+            boughtAmount = _tradeUniswapV3(
+                sellToken,
+                sellAmount,
+                order.bridgeData
+            );
         } else if (protocolId == BridgeProtocols.UNISWAPV2) {
             boughtAmount = _tradeUniswapV2(
                 buyToken,
@@ -119,6 +133,13 @@ contract BridgeAdapter is
                 sellAmount,
                 order.bridgeData
             );
+        } else if (protocolId == BridgeProtocols.BALANCERV2) {
+            boughtAmount = _tradeBalancerV2(
+                sellToken,
+                buyToken,
+                sellAmount,
+                order.bridgeData
+            );
         } else if (protocolId == BridgeProtocols.KYBER) {
             boughtAmount = _tradeKyber(
                 sellToken,
@@ -198,6 +219,12 @@ contract BridgeAdapter is
                 sellAmount,
                 order.bridgeData
             );
+        } else if (protocolId == BridgeProtocols.KYBERDMM) {
+            boughtAmount = _tradeKyberDmm(
+                buyToken,
+                sellAmount,
+                order.bridgeData
+            );
         } else {
             boughtAmount = _tradeZeroExBridge(
                 sellToken,

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

@@ -44,4 +44,7 @@ library BridgeProtocols {
     uint128 internal constant COFIX       = 14;
     uint128 internal constant NERVE       = 15;
     uint128 internal constant MAKERPSM    = 16;
+    uint128 internal constant BALANCERV2  = 17;
+    uint128 internal constant UNISWAPV3   = 18;
+    uint128 internal constant KYBERDMM    = 19;
 }

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinBalancerV2.sol

@@ -0,0 +1,117 @@
+// 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-erc20/contracts/src/v06/LibERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+
+
+interface IBalancerV2Vault {
+
+    enum SwapKind { GIVEN_IN, GIVEN_OUT }
+    /**
+     * @dev Performs a swap with a single Pool.
+     *
+     * If the swap is given in (the number of tokens to send to the Pool is known), returns the amount of tokens
+     * taken from the Pool, which must be greater than or equal to `limit`.
+     *
+     * If the swap is given out (the number of tokens to take from the Pool is known), returns the amount of
+     * tokens sent to the Pool, which must be less than or equal to `limit`.
+     *
+     * Internal Balance usage and the recipient are determined by the `funds` struct.
+     *
+     * Emits a `Swap` event.
+     * For full documentation see https://github.com/balancer-labs/balancer-core-v2/blob/master/contracts/vault/interfaces/IVault.sol
+     */
+    function swap(
+        SingleSwap calldata request,
+        FundManagement calldata funds,
+        uint256 limit,
+        uint256 deadline
+    ) external payable returns (uint256);
+
+    struct SingleSwap {
+        bytes32 poolId;
+        SwapKind kind;
+        IERC20TokenV06 assetIn;
+        IERC20TokenV06 assetOut;
+        uint256 amount;
+        bytes userData;
+    }
+
+    struct FundManagement {
+        address sender;
+        bool fromInternalBalance;
+        address payable recipient;
+        bool toInternalBalance;
+    }
+}
+
+contract MixinBalancerV2 {
+
+    using LibERC20TokenV06 for IERC20TokenV06;
+
+    struct BalancerV2BridgeData {
+        IBalancerV2Vault vault;
+        bytes32 poolId;
+    }
+
+    function _tradeBalancerV2(
+        IERC20TokenV06 sellToken,
+        IERC20TokenV06 buyToken,
+        uint256 sellAmount,
+        bytes memory bridgeData
+    )
+        internal
+        returns (uint256 boughtAmount)
+    {
+        // Decode the bridge data.
+        BalancerV2BridgeData memory data = abi.decode(bridgeData, (BalancerV2BridgeData));
+
+        // Grant an allowance to the exchange to spend `fromTokenAddress` token.
+        sellToken.approveIfBelow(address(data.vault), sellAmount);
+
+        // Sell the entire sellAmount
+        IBalancerV2Vault.SingleSwap memory request = IBalancerV2Vault.SingleSwap({
+            poolId: data.poolId,
+            kind: IBalancerV2Vault.SwapKind.GIVEN_IN,
+            assetIn: sellToken,
+            assetOut: buyToken,
+            amount: sellAmount, // amount in
+            userData: ""
+        });
+
+        IBalancerV2Vault.FundManagement memory funds = IBalancerV2Vault.FundManagement({
+            sender: address(this),
+            fromInternalBalance: false,
+            recipient: payable(address(this)),
+            toInternalBalance: false
+        });
+
+        boughtAmount = data.vault.swap(
+            request,
+            funds,
+            1, // min amount out
+            block.timestamp // expires after this block
+        );
+        return boughtAmount;
+    }
+}

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinCurve.sol

@@ -21,6 +21,7 @@ pragma solidity ^0.6.5;
 pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
 import "@0x/contracts-erc20/contracts/src/v06/LibERC20TokenV06.sol";
 import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
@@ -31,6 +32,15 @@ contract MixinCurve {
     using LibSafeMathV06 for uint256;
     using LibRichErrorsV06 for bytes;
 
+    /// @dev Mainnet address of the WETH contract.
+    IEtherTokenV06 private immutable WETH;
+
+    constructor(IEtherTokenV06 weth)
+        public
+    {
+        WETH = weth;
+    }
+
 
     struct CurveBridgeData {
         address curveAddress;
@@ -50,10 +60,17 @@ contract MixinCurve {
     {
         // Decode the bridge data to get the Curve metadata.
         CurveBridgeData memory data = abi.decode(bridgeData, (CurveBridgeData));
-        sellToken.approveIfBelow(data.curveAddress, sellAmount);
+        uint256 payableAmount;
+        if (sellToken == WETH) {
+            payableAmount = sellAmount;
+            WETH.withdraw(sellAmount);
+        } else {
+            sellToken.approveIfBelow(data.curveAddress, sellAmount);
+        }
+
         uint256 beforeBalance = buyToken.balanceOf(address(this));
         (bool success, bytes memory resultData) =
-            data.curveAddress.call(abi.encodeWithSelector(
+            data.curveAddress.call{value: payableAmount}(abi.encodeWithSelector(
                 data.exchangeFunctionSelector,
                 data.fromCoinIdx,
                 data.toCoinIdx,
@@ -65,6 +82,12 @@ contract MixinCurve {
         if (!success) {
             resultData.rrevert();
         }
+
+        if (buyToken == WETH) {
+            boughtAmount = address(this).balance;
+            WETH.deposit{ value: boughtAmount }();
+        }
+
         return buyToken.balanceOf(address(this)).safeSub(beforeBalance);
     }
 }

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinKyberDmm.sol

@@ -0,0 +1,94 @@
+// 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/LibERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "../IBridgeAdapter.sol";
+
+/*
+    KyberDmm Router
+*/
+interface IKyberDmmRouter {
+
+    /// @dev Swaps an exact amount of input tokens for as many output tokens as possible, along the route determined by the path.
+    ///      The first element of path is the input token, the last is the output token, and any intermediate elements represent
+    ///      intermediate pairs to trade through (if, for example, a direct pair does not exist).
+    /// @param amountIn The amount of input tokens to send.
+    /// @param amountOutMin The minimum amount of output tokens that must be received for the transaction not to revert.
+    /// @param pools An array of pool addresses. pools.length must be >= 1.
+    /// @param path An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
+    /// @param to Recipient of the output tokens.
+    /// @param deadline Unix timestamp after which the transaction will revert.
+    /// @return amounts The input token amount and all subsequent output token amounts.
+    function swapExactTokensForTokens(
+        uint amountIn,
+        uint amountOutMin,
+        address[] calldata pools,
+        address[] calldata path,
+        address to,
+        uint deadline
+    ) external returns (uint[] memory amounts);
+}
+
+contract MixinKyberDmm {
+
+    using LibERC20TokenV06 for IERC20TokenV06;
+
+    function _tradeKyberDmm(
+        IERC20TokenV06 buyToken,
+        uint256 sellAmount,
+        bytes memory bridgeData
+    )
+        internal
+        returns (uint256 boughtAmount)
+    {
+        address router;
+        address[] memory pools;
+        address[] memory path;
+        (router, pools, path) = abi.decode(bridgeData, (address, address[], address[]));
+
+        require(pools.length >= 1, "MixinKyberDmm/POOLS_LENGTH_MUST_BE_AT_LEAST_ONE");
+        require(path.length == pools.length + 1, "MixinKyberDmm/ARRAY_LENGTH_MISMATCH");
+         require(
+             path[path.length - 1] == address(buyToken),
+             "MixinKyberDmm/LAST_ELEMENT_OF_PATH_MUST_MATCH_OUTPUT_TOKEN"
+         );
+        // Grant the KyberDmm router an allowance to sell the first token.
+        IERC20TokenV06(path[0]).approveIfBelow(address(router), sellAmount);
+
+        uint[] memory amounts = IKyberDmmRouter(router).swapExactTokensForTokens(
+             // Sell all tokens we hold.
+            sellAmount,
+             // Minimum buy amount.
+            1,
+            pools,
+            // Convert to `buyToken` along this path.
+            path,
+            // Recipient is `this`.
+            address(this),
+            // Expires after this block.
+            block.timestamp
+        );
+        return amounts[amounts.length-1];
+    }
+}

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinMStable.sol

@@ -31,6 +31,7 @@ interface IMStable {
         IERC20TokenV06 sellToken,
         IERC20TokenV06 buyToken,
         uint256 sellAmount,
+        uint256 minBoughtAmount,
         address recipient
     )
         external
@@ -59,6 +60,8 @@ contract MixinMStable {
             sellToken,
             buyToken,
             sellAmount,
+            // Minimum buy amount.
+            1,
             address(this)
         );
     }

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinUniswapV2.sol

@@ -69,7 +69,7 @@ contract MixinUniswapV2 {
             assembly { path := _path }
         }
 
-        require(path.length >= 2, "MixinUniswapV3/PATH_LENGTH_MUST_BE_AT_LEAST_TWO");
+        require(path.length >= 2, "MixinUniswapV2/PATH_LENGTH_MUST_BE_AT_LEAST_TWO");
         require(
             path[path.length - 1] == buyToken,
             "MixinUniswapV2/LAST_ELEMENT_OF_PATH_MUST_MATCH_OUTPUT_TOKEN"

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinUniswapV3.sol

@@ -0,0 +1,70 @@
+// 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/LibERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "../IBridgeAdapter.sol";
+
+interface IUniswapV3Router {
+
+    struct ExactInputParams {
+        bytes path;
+        address recipient;
+        uint256 deadline;
+        uint256 amountIn;
+        uint256 amountOutMinimum;
+    }
+
+    function exactInput(ExactInputParams memory params)
+        external
+        payable
+        returns (uint256 amountOut);
+}
+
+contract MixinUniswapV3 {
+
+    using LibERC20TokenV06 for IERC20TokenV06;
+
+    function _tradeUniswapV3(
+        IERC20TokenV06 sellToken,
+        uint256 sellAmount,
+        bytes memory bridgeData
+    )
+        internal
+        returns (uint256 boughtAmount)
+    {
+        (IUniswapV3Router router, bytes memory path) =
+            abi.decode(bridgeData, (IUniswapV3Router, bytes));
+
+        // Grant the Uniswap router an allowance to sell the sell token.
+        sellToken.approveIfBelow(address(router), sellAmount);
+
+        boughtAmount = router.exactInput(IUniswapV3Router.ExactInputParams({
+            path: path,
+            recipient: address(this),
+            deadline: block.timestamp,
+            amountIn: sellAmount,
+            amountOutMinimum: 1
+        }));
+    }
+}

contracts/zero-ex/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-zero-ex",
-    "version": "0.22.0",
+    "version": "0.24.1",
     "engines": {
         "node": ">=6.12"
     },
@@ -43,7 +43,7 @@
     "config": {
         "publicInterfaceContracts": "IZeroEx,ZeroEx,FullMigration,InitialMigration,IFlashWallet,IERC20Transformer,IOwnableFeature,ISimpleFunctionRegistryFeature,ITransformERC20Feature,FillQuoteTransformer,PayTakerTransformer,PositiveSlippageFeeTransformer,WethTransformer,OwnableFeature,SimpleFunctionRegistryFeature,TransformERC20Feature,AffiliateFeeTransformer,MetaTransactionsFeature,LogMetadataTransformer,BridgeAdapter,LiquidityProviderFeature,ILiquidityProviderFeature,NativeOrdersFeature,INativeOrdersFeature,FeeCollectorController,FeeCollector,CurveLiquidityProvider,BatchFillNativeOrdersFeature,IBatchFillNativeOrdersFeature,MultiplexFeature,IMultiplexFeature",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
-        "abis": "./test/generated-artifacts/@(AffiliateFeeTransformer|BatchFillNativeOrdersFeature|BootstrapFeature|BridgeAdapter|BridgeProtocols|CurveLiquidityProvider|FeeCollector|FeeCollectorController|FillQuoteTransformer|FixinCommon|FixinEIP712|FixinProtocolFees|FixinReentrancyGuard|FixinTokenSpender|FlashWallet|FullMigration|IBatchFillNativeOrdersFeature|IBootstrapFeature|IBridgeAdapter|IERC20Bridge|IERC20Transformer|IFeature|IFlashWallet|ILiquidityProvider|ILiquidityProviderFeature|ILiquidityProviderSandbox|IMetaTransactionsFeature|IMooniswapPool|IMultiplexFeature|INativeOrdersEvents|INativeOrdersFeature|IOwnableFeature|IPancakeSwapFeature|ISimpleFunctionRegistryFeature|IStaking|ITestSimpleFunctionRegistryFeature|ITokenSpenderFeature|ITransformERC20Feature|IUniswapFeature|IUniswapV2Pair|IZeroEx|InitialMigration|LibBootstrap|LibCommonRichErrors|LibERC20Transformer|LibFeeCollector|LibLiquidityProviderRichErrors|LibMetaTransactionsRichErrors|LibMetaTransactionsStorage|LibMigrate|LibNativeOrder|LibNativeOrdersRichErrors|LibNativeOrdersStorage|LibOwnableRichErrors|LibOwnableStorage|LibProxyRichErrors|LibProxyStorage|LibReentrancyGuardStorage|LibSignature|LibSignatureRichErrors|LibSimpleFunctionRegistryRichErrors|LibSimpleFunctionRegistryStorage|LibStorage|LibTransformERC20RichErrors|LibTransformERC20Storage|LibWalletRichErrors|LiquidityProviderFeature|LiquidityProviderSandbox|LogMetadataTransformer|MetaTransactionsFeature|MixinBalancer|MixinBancor|MixinCoFiX|MixinCryptoCom|MixinCurve|MixinDodo|MixinDodoV2|MixinKyber|MixinMStable|MixinMakerPSM|MixinMooniswap|MixinNerve|MixinOasis|MixinShell|MixinUniswap|MixinUniswapV2|MixinZeroExBridge|MooniswapLiquidityProvider|MultiplexFeature|NativeOrdersCancellation|NativeOrdersFeature|NativeOrdersInfo|NativeOrdersProtocolFees|NativeOrdersSettlement|OwnableFeature|PancakeSwapFeature|PayTakerTransformer|PermissionlessTransformerDeployer|PositiveSlippageFeeTransformer|SimpleFunctionRegistryFeature|TestBridge|TestCallTarget|TestCurve|TestDelegateCaller|TestFeeCollectorController|TestFillQuoteTransformerBridge|TestFillQuoteTransformerExchange|TestFillQuoteTransformerHost|TestFixinProtocolFees|TestFixinTokenSpender|TestFullMigration|TestInitialMigration|TestLibNativeOrder|TestLibSignature|TestLiquidityProvider|TestMetaTransactionsNativeOrdersFeature|TestMetaTransactionsTransformERC20Feature|TestMigrator|TestMintTokenERC20Transformer|TestMintableERC20Token|TestMooniswap|TestNativeOrdersFeature|TestOrderSignerRegistryWithContractWallet|TestPermissionlessTransformerDeployerSuicidal|TestPermissionlessTransformerDeployerTransformer|TestRfqOriginRegistration|TestSimpleFunctionRegistryFeatureImpl1|TestSimpleFunctionRegistryFeatureImpl2|TestStaking|TestTokenSpenderERC20Token|TestTransformERC20|TestTransformerBase|TestTransformerDeployerTransformer|TestTransformerHost|TestWeth|TestWethTransformerHost|TestZeroExFeature|TransformERC20Feature|Transformer|TransformerDeployer|UniswapFeature|WethTransformer|ZeroEx|ZeroExOptimized).json"
+        "abis": "./test/generated-artifacts/@(AffiliateFeeTransformer|BatchFillNativeOrdersFeature|BootstrapFeature|BridgeAdapter|BridgeProtocols|CurveLiquidityProvider|FeeCollector|FeeCollectorController|FillQuoteTransformer|FixinCommon|FixinEIP712|FixinProtocolFees|FixinReentrancyGuard|FixinTokenSpender|FlashWallet|FullMigration|IBatchFillNativeOrdersFeature|IBootstrapFeature|IBridgeAdapter|IERC20Bridge|IERC20Transformer|IFeature|IFlashWallet|ILiquidityProvider|ILiquidityProviderFeature|ILiquidityProviderSandbox|IMetaTransactionsFeature|IMooniswapPool|IMultiplexFeature|INativeOrdersEvents|INativeOrdersFeature|IOwnableFeature|IPancakeSwapFeature|ISimpleFunctionRegistryFeature|IStaking|ITestSimpleFunctionRegistryFeature|ITokenSpenderFeature|ITransformERC20Feature|IUniswapFeature|IUniswapV2Pair|IZeroEx|InitialMigration|LibBootstrap|LibCommonRichErrors|LibERC20Transformer|LibFeeCollector|LibLiquidityProviderRichErrors|LibMetaTransactionsRichErrors|LibMetaTransactionsStorage|LibMigrate|LibNativeOrder|LibNativeOrdersRichErrors|LibNativeOrdersStorage|LibOwnableRichErrors|LibOwnableStorage|LibProxyRichErrors|LibProxyStorage|LibReentrancyGuardStorage|LibSignature|LibSignatureRichErrors|LibSimpleFunctionRegistryRichErrors|LibSimpleFunctionRegistryStorage|LibStorage|LibTransformERC20RichErrors|LibTransformERC20Storage|LibWalletRichErrors|LiquidityProviderFeature|LiquidityProviderSandbox|LogMetadataTransformer|MetaTransactionsFeature|MixinBalancer|MixinBalancerV2|MixinBancor|MixinCoFiX|MixinCryptoCom|MixinCurve|MixinDodo|MixinDodoV2|MixinKyber|MixinKyberDmm|MixinMStable|MixinMakerPSM|MixinMooniswap|MixinNerve|MixinOasis|MixinShell|MixinUniswap|MixinUniswapV2|MixinUniswapV3|MixinZeroExBridge|MooniswapLiquidityProvider|MultiplexFeature|NativeOrdersCancellation|NativeOrdersFeature|NativeOrdersInfo|NativeOrdersProtocolFees|NativeOrdersSettlement|OwnableFeature|PancakeSwapFeature|PayTakerTransformer|PermissionlessTransformerDeployer|PositiveSlippageFeeTransformer|SimpleFunctionRegistryFeature|TestBridge|TestCallTarget|TestCurve|TestDelegateCaller|TestFeeCollectorController|TestFillQuoteTransformerBridge|TestFillQuoteTransformerExchange|TestFillQuoteTransformerHost|TestFixinProtocolFees|TestFixinTokenSpender|TestFullMigration|TestInitialMigration|TestLibNativeOrder|TestLibSignature|TestLiquidityProvider|TestMetaTransactionsNativeOrdersFeature|TestMetaTransactionsTransformERC20Feature|TestMigrator|TestMintTokenERC20Transformer|TestMintableERC20Token|TestMooniswap|TestNativeOrdersFeature|TestOrderSignerRegistryWithContractWallet|TestPermissionlessTransformerDeployerSuicidal|TestPermissionlessTransformerDeployerTransformer|TestRfqOriginRegistration|TestSimpleFunctionRegistryFeatureImpl1|TestSimpleFunctionRegistryFeatureImpl2|TestStaking|TestTokenSpenderERC20Token|TestTransformERC20|TestTransformerBase|TestTransformerDeployerTransformer|TestTransformerHost|TestWeth|TestWethTransformerHost|TestZeroExFeature|TransformERC20Feature|Transformer|TransformerDeployer|UniswapFeature|WethTransformer|ZeroEx|ZeroExOptimized).json"
     },
     "repository": {
         "type": "git",
@@ -55,16 +55,16 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/zero-ex",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.21",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/order-utils": "^10.4.19",
-        "@0x/sol-compiler": "^4.6.1",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/order-utils": "^10.4.23",
+        "@0x/sol-compiler": "^4.7.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
+        "@0x/tslint-config": "^4.1.4",
         "@types/isomorphic-fetch": "^0.0.35",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -82,15 +82,15 @@
         "typescript": "4.2.2"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/protocol-utils": "^1.5.0",
-        "@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"
+        "@0x/base-contract": "^6.4.0",
+        "@0x/protocol-utils": "^1.6.2",
+        "@0x/subproviders": "^6.5.3",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10"
     },
     "publishConfig": {
         "access": "public"

contracts/zero-ex/src/nonce_utils.ts

@@ -20,6 +20,7 @@ export function rlpEncodeNonce(nonce: number): string {
         return ethjs.bufferToHex(ethjs.toBuffer(nonce));
     } else {
         const rlpNonce = ethjs.toBuffer(nonce);
+        // tslint:disable-next-line: restrict-plus-operands
         return hexUtils.concat(rlpNonce.length + 0x80, ethjs.bufferToHex(rlpNonce));
     }
 }

contracts/zero-ex/test/artifacts.ts

@@ -76,6 +76,7 @@ import * as LiquidityProviderSandbox from '../test/generated-artifacts/Liquidity
 import * as LogMetadataTransformer from '../test/generated-artifacts/LogMetadataTransformer.json';
 import * as MetaTransactionsFeature from '../test/generated-artifacts/MetaTransactionsFeature.json';
 import * as MixinBalancer from '../test/generated-artifacts/MixinBalancer.json';
+import * as MixinBalancerV2 from '../test/generated-artifacts/MixinBalancerV2.json';
 import * as MixinBancor from '../test/generated-artifacts/MixinBancor.json';
 import * as MixinCoFiX from '../test/generated-artifacts/MixinCoFiX.json';
 import * as MixinCryptoCom from '../test/generated-artifacts/MixinCryptoCom.json';
@@ -83,6 +84,7 @@ import * as MixinCurve from '../test/generated-artifacts/MixinCurve.json';
 import * as MixinDodo from '../test/generated-artifacts/MixinDodo.json';
 import * as MixinDodoV2 from '../test/generated-artifacts/MixinDodoV2.json';
 import * as MixinKyber from '../test/generated-artifacts/MixinKyber.json';
+import * as MixinKyberDmm from '../test/generated-artifacts/MixinKyberDmm.json';
 import * as MixinMakerPSM from '../test/generated-artifacts/MixinMakerPSM.json';
 import * as MixinMooniswap from '../test/generated-artifacts/MixinMooniswap.json';
 import * as MixinMStable from '../test/generated-artifacts/MixinMStable.json';
@@ -91,6 +93,7 @@ import * as MixinOasis from '../test/generated-artifacts/MixinOasis.json';
 import * as MixinShell from '../test/generated-artifacts/MixinShell.json';
 import * as MixinUniswap from '../test/generated-artifacts/MixinUniswap.json';
 import * as MixinUniswapV2 from '../test/generated-artifacts/MixinUniswapV2.json';
+import * as MixinUniswapV3 from '../test/generated-artifacts/MixinUniswapV3.json';
 import * as MixinZeroExBridge from '../test/generated-artifacts/MixinZeroExBridge.json';
 import * as MooniswapLiquidityProvider from '../test/generated-artifacts/MooniswapLiquidityProvider.json';
 import * as MultiplexFeature from '../test/generated-artifacts/MultiplexFeature.json';
@@ -235,6 +238,7 @@ export const artifacts = {
     BridgeProtocols: BridgeProtocols as ContractArtifact,
     IBridgeAdapter: IBridgeAdapter as ContractArtifact,
     MixinBalancer: MixinBalancer as ContractArtifact,
+    MixinBalancerV2: MixinBalancerV2 as ContractArtifact,
     MixinBancor: MixinBancor as ContractArtifact,
     MixinCoFiX: MixinCoFiX as ContractArtifact,
     MixinCryptoCom: MixinCryptoCom as ContractArtifact,
@@ -242,6 +246,7 @@ export const artifacts = {
     MixinDodo: MixinDodo as ContractArtifact,
     MixinDodoV2: MixinDodoV2 as ContractArtifact,
     MixinKyber: MixinKyber as ContractArtifact,
+    MixinKyberDmm: MixinKyberDmm as ContractArtifact,
     MixinMStable: MixinMStable as ContractArtifact,
     MixinMakerPSM: MixinMakerPSM as ContractArtifact,
     MixinMooniswap: MixinMooniswap as ContractArtifact,
@@ -250,6 +255,7 @@ export const artifacts = {
     MixinShell: MixinShell as ContractArtifact,
     MixinUniswap: MixinUniswap as ContractArtifact,
     MixinUniswapV2: MixinUniswapV2 as ContractArtifact,
+    MixinUniswapV3: MixinUniswapV3 as ContractArtifact,
     MixinZeroExBridge: MixinZeroExBridge as ContractArtifact,
     ILiquidityProvider: ILiquidityProvider as ContractArtifact,
     IMooniswapPool: IMooniswapPool as ContractArtifact,

contracts/zero-ex/test/features/selector_collision_test.ts

@@ -3,9 +3,14 @@ import { MethodAbi } from 'ethereum-types';
 
 import * as wrappers from '../../src/wrappers';
 
+// tslint:disable:no-string-literal
+
 blockchainTests('Selector collision test', env => {
     it('Function selectors do not collide', () => {
         const selectorToSignature: { [selector: string]: string } = {};
+        selectorToSignature['bca8c7b5'] = 'executeCall(address,bytes)'; // legacy allowance target
+        selectorToSignature['a9059cbb'] = 'transfer(address,uint256)'; // ERC20Token transfer
+        selectorToSignature['23b872dd'] = 'transferFrom(address,address,uint256)'; // ERC20Token transferFrom
         for (const wrapper of Object.values(wrappers)) {
             if (typeof wrapper === 'function') {
                 const contract = new wrapper(constants.NULL_ADDRESS, env.provider, env.txDefaults);

contracts/zero-ex/test/permissionless_transformer_deployer_test.ts

@@ -1,6 +1,5 @@
 import { blockchainTests, expect, verifyEventsFromLogs } from '@0x/contracts-test-utils';
 import { BigNumber, hexUtils } from '@0x/utils';
-import * as ethjs from 'ethereumjs-util';
 
 import { artifacts } from './artifacts';
 import {
@@ -41,9 +40,9 @@ blockchainTests.resets('PermissionlessTransformerDeployer', env => {
         it('deploys at predictable address', async () => {
             const salt = hexUtils.random();
             const targetAddress = await deployer.deploy(deployBytes, salt).callAsync();
-            const initCodeHash = hexUtils.toHex(ethjs.sha3(deployBytes));
+            const initCodeHash = hexUtils.hash(deployBytes);
             const expectedAddress = hexUtils.slice(
-                hexUtils.toHex(ethjs.sha3(hexUtils.concat('0xFF', deployer.address, salt, initCodeHash))),
+                hexUtils.hash(hexUtils.concat('0xFF', deployer.address, salt, initCodeHash)),
                 12,
             );
 
@@ -94,7 +93,7 @@ blockchainTests.resets('PermissionlessTransformerDeployer', env => {
             const targetAddress = await deployer.deploy(deployBytes, salt).callAsync({ from: sender });
             await deployer.deploy(deployBytes, salt).awaitTransactionSuccessAsync({ from: sender });
             expect(hexUtils.toHex(await deployer.toInitCodeHash(targetAddress).callAsync())).to.eq(
-                hexUtils.toHex(ethjs.sha3(deployBytes)),
+                hexUtils.hash(deployBytes),
             );
         });
     });

contracts/zero-ex/test/wrappers.ts

@@ -74,6 +74,7 @@ export * from '../test/generated-wrappers/liquidity_provider_sandbox';
 export * from '../test/generated-wrappers/log_metadata_transformer';
 export * from '../test/generated-wrappers/meta_transactions_feature';
 export * from '../test/generated-wrappers/mixin_balancer';
+export * from '../test/generated-wrappers/mixin_balancer_v2';
 export * from '../test/generated-wrappers/mixin_bancor';
 export * from '../test/generated-wrappers/mixin_co_fi_x';
 export * from '../test/generated-wrappers/mixin_crypto_com';
@@ -81,6 +82,7 @@ export * from '../test/generated-wrappers/mixin_curve';
 export * from '../test/generated-wrappers/mixin_dodo';
 export * from '../test/generated-wrappers/mixin_dodo_v2';
 export * from '../test/generated-wrappers/mixin_kyber';
+export * from '../test/generated-wrappers/mixin_kyber_dmm';
 export * from '../test/generated-wrappers/mixin_m_stable';
 export * from '../test/generated-wrappers/mixin_maker_p_s_m';
 export * from '../test/generated-wrappers/mixin_mooniswap';
@@ -89,6 +91,7 @@ export * from '../test/generated-wrappers/mixin_oasis';
 export * from '../test/generated-wrappers/mixin_shell';
 export * from '../test/generated-wrappers/mixin_uniswap';
 export * from '../test/generated-wrappers/mixin_uniswap_v2';
+export * from '../test/generated-wrappers/mixin_uniswap_v3';
 export * from '../test/generated-wrappers/mixin_zero_ex_bridge';
 export * from '../test/generated-wrappers/mooniswap_liquidity_provider';
 export * from '../test/generated-wrappers/multiplex_feature';

contracts/zero-ex/tsconfig.json

@@ -105,6 +105,7 @@
         "test/generated-artifacts/LogMetadataTransformer.json",
         "test/generated-artifacts/MetaTransactionsFeature.json",
         "test/generated-artifacts/MixinBalancer.json",
+        "test/generated-artifacts/MixinBalancerV2.json",
         "test/generated-artifacts/MixinBancor.json",
         "test/generated-artifacts/MixinCoFiX.json",
         "test/generated-artifacts/MixinCryptoCom.json",
@@ -112,6 +113,7 @@
         "test/generated-artifacts/MixinDodo.json",
         "test/generated-artifacts/MixinDodoV2.json",
         "test/generated-artifacts/MixinKyber.json",
+        "test/generated-artifacts/MixinKyberDmm.json",
         "test/generated-artifacts/MixinMStable.json",
         "test/generated-artifacts/MixinMakerPSM.json",
         "test/generated-artifacts/MixinMooniswap.json",
@@ -120,6 +122,7 @@
         "test/generated-artifacts/MixinShell.json",
         "test/generated-artifacts/MixinUniswap.json",
         "test/generated-artifacts/MixinUniswapV2.json",
+        "test/generated-artifacts/MixinUniswapV3.json",
         "test/generated-artifacts/MixinZeroExBridge.json",
         "test/generated-artifacts/MooniswapLiquidityProvider.json",
         "test/generated-artifacts/MultiplexFeature.json",

package.json

@@ -10,7 +10,7 @@
     ],
     "scripts": {
         "deps_versions:ci": "node ./node_modules/@0x/monorepo-scripts/lib/deps_versions.js",
-        "fix": "wsrun fix $PKG --fast-exit --parallel --exclude-missing",
+        "fix": "wsrun --fast-exit --parallel --exclude-missing -p $PKG -c fix",
         "ganache": "ganache-cli -p 8545 --gasLimit 10000000 --networkId 50 -m \"${npm_package_config_mnemonic}\"",
         "prettier": "prettier --write '**/*.{ts,tsx,json,md}' --config .prettierrc",
         "prettier:ci": "prettier --list-different '**/*.{ts,tsx,json,md}' --config .prettierrc",
@@ -27,31 +27,25 @@
         "install:all": "yarn install",
         "wsrun": "wsrun",
         "lerna": "lerna",
-        "build": "lerna link && wsrun build $PKG -r --stages --fast-exit --exclude-missing",
-        "build:ci": "lerna link && wsrun build:ci $PKG --fast-exit -r --stages --exclude-missing",
-        "build:contracts": "lerna link && wsrun build -p ${npm_package_config_contractsPackages} -c --fast-exit -r --stages --exclude-missing",
+        "build": "lerna link && wsrun -r --stages --fast-exit --exclude-missing -p $PKG -c build",
+        "build:ci": "lerna link && wsrun --fast-exit -r --stages --exclude-missing -p $PKG -c build:ci",
+        "build:contracts": "lerna link && wsrun -p ${npm_package_config_contractsPackages} --fast-exit -r --stages --exclude-missing -c build",
         "build:ts": "tsc -b",
         "watch:ts": "tsc -b -w",
-        "clean": "wsrun clean $PKG --fast-exit -r --parallel --exclude-missing",
-        "clean:contracts": "wsrun clean -p ${npm_package_config_contractsPackages} -c --fast-exit -r --parallel --exclude-missing",
-        "contracts:gen": "wsrun contracts:gen $PKG --fast-exit -r --parallel --exclude-missing",
-        "contracts:compile": "wsrun compile -p ${npm_package_config_contractsPackages} --fast-exit -r --stages --exclude-missing",
-        "contracts:compile:truffle": "wsrun compile:truffle -p ${npm_package_config_contractsPackages} --fast-exit -r --stages --exclude-missing",
-        "contracts:watch": "wsrun watch $PKG --parallel --exclude-missing",
+        "clean": "wsrun --fast-exit -r --parallel --exclude-missing -p $PKG -c clean",
+        "contracts:watch": "wsrun --parallel --exclude-missing -p $PKG -c watch",
         "remove_node_modules": "lerna clean --yes; rm -rf node_modules",
         "rebuild": "run-s clean build",
-        "test": "wsrun test $(echo $(echo ${npm_package_config_contractsPackages} ${npm_package_config_nonContractPackages} | tr ' ' '\n' | sort | uniq) ${npm_package_config_ignoreTestsForPackages} | tr ' ' '\n' | sort | uniq -u | tr '\n' ' ') --fast-exit --serial --exclude-missing",
-        "test:all": "wsrun test $PKG --fast-exit --serial --exclude-missing",
-        "test:contracts": "wsrun test --serial -p $(echo ${npm_package_config_contractsPackages} ${npm_package_config_ignoreTestsForPackages} | tr ' ' '\n' | sort | uniq -u | tr '\n' ' ') -c --fast-exit --exclude-missing",
-        "test:contracts:all": "wsrun test --serial -p ${npm_package_config_contractsPackages} -c --fast-exit --exclude-missing",
+        "test": "wsrun --fast-exit --serial --exclude-missing -p $(echo $(echo ${npm_package_config_contractsPackages} ${npm_package_config_nonContractPackages} | tr ' ' '\n' | sort | uniq) ${npm_package_config_ignoreTestsForPackages} | tr ' ' '\n' | sort | uniq -u | tr '\n' ' ') -c test",
+        "test:all": "wsrun --fast-exit --serial --exclude-missing -p $PKG -c test",
+        "test:contracts": "wsrun --serial -p $(echo ${npm_package_config_contractsPackages} ${npm_package_config_ignoreTestsForPackages} | tr ' ' '\n' | sort | uniq -u | tr '\n' ' ') --fast-exit --exclude-missing -c test",
+        "test:contracts:all": "wsrun --serial -p ${npm_package_config_contractsPackages} --fast-exit --exclude-missing -c test",
         "generate_doc": "node ./node_modules/@0x/monorepo-scripts/lib/doc_generate.js --config ./doc-gen-config.json",
-        "upload_md_docs": "aws s3 rm --recursive s3://docs-markdown; wsrun s3:sync_md_docs --exclude-missing",
-        "diff_md_docs:ci": "wsrun diff_docs --exclude-missing",
+        "upload_md_docs": "aws s3 rm --recursive s3://docs-markdown; wsrun --exclude-missing -c s3:sync_md_docs",
+        "diff_md_docs:ci": "wsrun --exclude-missing -c diff_docs",
         "test:generate_docs:circleci": "for i in ${npm_package_config_packagesWithDocPages}; do yarn generate_doc --package $i || break -1; done;",
         "bundlewatch": "bundlewatch",
-        "lint": "wsrun lint $PKG --fast-exit --parallel --exclude-missing",
-        "lint:stages": "wsrun lint $PKG --fast-exit --stages --exclude-missing",
-        "lint:contracts": "wsrun lint -p ${npm_package_config_contractsPackages} -c --fast-exit --stages --exclude-missing",
+        "lint": "wsrun --fast-exit --parallel --exclude-missing -p $PKG -c lint",
         "upgrade_org_deps": "node node_modules/@0x/monorepo-scripts/lib/upgrade_deps.js -p '@0x|ethereum-types'",
         "upgrade_deps": "node node_modules/@0x/monorepo-scripts/lib/upgrade_deps.js",
         "verdaccio": "docker run --rm -i -p 4873:4873 0xorg/verdaccio"
@@ -66,7 +60,7 @@
         "ignoreDependencyVersionsForPackage": "contract-wrappers"
     },
     "devDependencies": {
-        "@0x/monorepo-scripts": "^3.1.1",
+        "@0x/monorepo-scripts": "^3.1.7",
         "@0x-lerna-fork/lerna": "3.16.10",
         "@0xproject/npm-cli-login": "^0.0.11",
         "async-child-process": "^1.1.1",
@@ -78,7 +72,7 @@
         "prettier": "~1.16.3",
         "source-map-support": "^0.5.6",
         "typescript": "4.2.2",
-        "wsrun": "^2.2.0"
+        "wsrun": "^5.2.4"
     },
     "resolutions": {
         "merkle-patricia-tree": "^2.3.2"

packages/asset-swapper/CHANGELOG.json

@@ -1,4 +1,166 @@
 [
+    {
+        "version": "6.16.0",
+        "changes": [
+            {
+                "note": "Add support for the Polygon chain",
+                "pr": 240
+            }
+        ],
+        "timestamp": 1621944788
+    },
+    {
+        "version": "6.15.0",
+        "changes": [
+            {
+                "note": "Fix KyberDmm",
+                "pr": 236
+            },
+            {
+                "note": "Re-enable KyberDmm",
+                "pr": 247
+            },
+            {
+                "note": "Add Huobi Token to liquidity provider tokens",
+                "pr": 246
+            },
+            {
+                "note": "Temporarily disable specific LiquidityProvider"
+            }
+        ],
+        "timestamp": 1621600614
+    },
+    {
+        "version": "6.14.0",
+        "changes": [
+            {
+                "note": "Add support for additional sources and intermediate tokens on Ropsten",
+                "pr": 231
+            }
+        ],
+        "timestamp": 1620810800
+    },
+    {
+        "version": "6.13.0",
+        "changes": [
+            {
+                "note": "Add LiquidityProvider to BSC sources",
+                "pr": 234
+            }
+        ],
+        "timestamp": 1620703098
+    },
+    {
+        "version": "6.12.0",
+        "changes": [
+            {
+                "note": "`TwoHopSampler` to use `call` over `staticcall` in order to support sources like `Uniswap_V3` and `Balancer_V2`",
+                "pr": 233
+            }
+        ],
+        "timestamp": 1620610602
+    },
+    {
+        "version": "6.11.0",
+        "changes": [
+            {
+                "note": "Add price comparisons data separate from the quote report",
+                "pr": 219
+            },
+            {
+                "note": "Add caching for top Balancer V2 pools on startup and during regular intervals",
+                "pr": 228
+            },
+            {
+                "note": "Tweak compiler settings for smaller sampler bytecode",
+                "pr": 229
+            },
+            {
+                "note": "Fix Multiplex multihop encoding for ETH buys/sells",
+                "pr": 230
+            },
+            {
+                "note": "Fix Sampler address override for Ganache",
+                "pr": 232
+            }
+        ],
+        "timestamp": 1620362129
+    },
+    {
+        "version": "6.10.0",
+        "changes": [
+            {
+                "note": "Reactivate PancakeSwapV2 and BakerySwap VIP on BSC",
+                "pr": 222
+            },
+            {
+                "note": "Add LUSD Curve pool",
+                "pr": 218
+            },
+            {
+                "note": "Fix exchangeProxyGasOverhead for fallback path",
+                "pr": 215
+            },
+            {
+                "note": "Enable ETH based Curve pools",
+                "pr": 220
+            },
+            {
+                "note": "Reactivate PancakeSwapV2 and BakerySwap VIP on BSC",
+                "pr": 222
+            },
+            {
+                "note": "Disable WETH based SnowSwap pools",
+                "pr": 220
+            },
+            {
+                "note": "PLP now includes a fallback due to observed collisions",
+                "pr": 223
+            },
+            {
+                "note": "Add Balancer V2 integration",
+                "pr": 206
+            },
+            {
+                "note": "Re-work the PoolCache for Balancer et al",
+                "pr": 226
+            }
+        ],
+        "timestamp": 1620214333
+    },
+    {
+        "version": "6.9.1",
+        "changes": [
+            {
+                "note": "Temporarily remove PancakeV2 and BakerySwap from VIP"
+            }
+        ],
+        "timestamp": 1619830995
+    },
+    {
+        "version": "6.9.0",
+        "changes": [
+            {
+                "note": "Remove conflicting Kyber reserve",
+                "pr": 216
+            }
+        ],
+        "timestamp": 1619825976
+    },
+    {
+        "version": "6.8.0",
+        "changes": [
+            {
+                "note": "Prune paths which cannot improve the best path",
+                "pr": 183
+            },
+            {
+                "note": "Use FastABI for Sampler ABI encoding and decoding",
+                "pr": 183
+            }
+        ],
+        "timestamp": 1619596077
+    },
     {
         "version": "6.7.0",
         "changes": [
@@ -24,6 +186,10 @@
             {
                 "note": "Support `Ropsten` network",
                 "pr": 203
+            },
+            {
+                "note": "BSC Uniswap clones (ApeSwap, CafeSwap, CheeseSwap, JulSwap), Saddle BTC pool, Curve gas schedule",
+                "pr": 208
             }
         ],
         "timestamp": 1618592834

packages/asset-swapper/CHANGELOG.md

@@ -5,6 +5,62 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v6.16.0 - _May 25, 2021_
+
+    * Add support for the Polygon chain (#240)
+
+## v6.15.0 - _May 21, 2021_
+
+    * Fix KyberDmm (#236)
+    * Re-enable KyberDmm (#247)
+    * Add Huobi Token to liquidity provider tokens (#246)
+    * Temporarily disable specific LiquidityProvider
+
+## v6.14.0 - _May 12, 2021_
+
+    * Add support for additional sources and intermediate tokens on Ropsten (#231)
+
+## v6.13.0 - _May 11, 2021_
+
+    * Add LiquidityProvider to BSC sources (#234)
+
+## v6.12.0 - _May 10, 2021_
+
+    * `TwoHopSampler` to use `call` over `staticcall` in order to support sources like `Uniswap_V3` and `Balancer_V2` (#233)
+
+## v6.11.0 - _May 7, 2021_
+
+    * Add price comparisons data separate from the quote report (#219)
+    * Add caching for top Balancer V2 pools on startup and during regular intervals (#228)
+    * Tweak compiler settings for smaller sampler bytecode (#229)
+    * Fix Multiplex multihop encoding for ETH buys/sells (#230)
+    * Fix Sampler address override for Ganache (#232)
+
+## v6.10.0 - _May 5, 2021_
+
+    * Reactivate PancakeSwapV2 and BakerySwap VIP on BSC (#222)
+    * Add LUSD Curve pool (#218)
+    * Fix exchangeProxyGasOverhead for fallback path (#215)
+    * Enable ETH based Curve pools (#220)
+    * Reactivate PancakeSwapV2 and BakerySwap VIP on BSC (#222)
+    * Disable WETH based SnowSwap pools (#220)
+    * PLP now includes a fallback due to observed collisions (#223)
+    * Add Balancer V2 integration (#206)
+    * Re-work the PoolCache for Balancer et al (#226)
+
+## v6.9.1 - _May 1, 2021_
+
+    * Temporarily remove PancakeV2 and BakerySwap from VIP
+
+## v6.9.0 - _April 30, 2021_
+
+    * Remove conflicting Kyber reserve (#216)
+
+## v6.8.0 - _April 28, 2021_
+
+    * Prune paths which cannot improve the best path (#183)
+    * Use FastABI for Sampler ABI encoding and decoding (#183)
+
 ## v6.7.0 - _April 26, 2021_
 
     * Support PancakeSwap V2 (#211)
@@ -16,6 +72,7 @@ CHANGELOG
 ## v6.6.0 - _April 16, 2021_
 
     * Support `Ropsten` network (#203)
+    * BSC Uniswap clones (ApeSwap, CafeSwap, CheeseSwap, JulSwap), Saddle BTC pool, Curve gas schedule (#208)
 
 ## v6.5.3 - _April 14, 2021_
 

packages/asset-swapper/compiler.json

@@ -6,11 +6,7 @@
     "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
-        "optimizer": {
-            "enabled": true,
-            "runs": 62500,
-            "details": { "yul": true, "deduplicate": true, "cse": true, "constantOptimizer": true }
-        },
+        "optimizer": { "enabled": true, "runs": 200, "details": { "yul": true, "deduplicate": true } },
         "outputSelection": {
             "*": {
                 "*": [

packages/asset-swapper/contracts/src/BalancerV2Sampler.sol

@@ -0,0 +1,189 @@
+// 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;
+pragma experimental ABIEncoderV2;
+
+import "./SamplerUtils.sol";
+
+/// @dev Minimal Balancer V2 Vault interface
+///      for documentation refer to https://github.com/balancer-labs/balancer-core-v2/blob/master/contracts/vault/interfaces/IVault.sol
+interface IBalancerV2Vault {
+    enum SwapKind { GIVEN_IN, GIVEN_OUT }
+
+    struct BatchSwapStep {
+        bytes32 poolId;
+        uint256 assetInIndex;
+        uint256 assetOutIndex;
+        uint256 amount;
+        bytes userData;
+    }
+
+    struct FundManagement {
+        address sender;
+        bool fromInternalBalance;
+        address payable recipient;
+        bool toInternalBalance;
+    }
+
+    function queryBatchSwap(
+        SwapKind kind,
+        BatchSwapStep[] calldata swaps,
+        IAsset[] calldata assets,
+        FundManagement calldata funds
+    ) external returns (int256[] memory assetDeltas);
+}
+interface IAsset {
+    // solhint-disable-previous-line no-empty-blocks
+}
+
+contract BalancerV2Sampler is SamplerUtils {
+
+    struct BalancerV2PoolInfo {
+        bytes32 poolId;
+        address vault;
+    }
+
+    /// @dev Sample sell quotes from Balancer V2.
+    /// @param poolInfo Struct with pool related data
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromBalancerV2(
+        BalancerV2PoolInfo memory poolInfo,
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        returns (uint256[] memory makerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        IBalancerV2Vault vault = IBalancerV2Vault(poolInfo.vault);
+        IAsset[] memory swapAssets = new IAsset[](2);
+        swapAssets[0] = IAsset(takerToken);
+        swapAssets[1] = IAsset(makerToken);
+
+        uint256 numSamples = takerTokenAmounts.length;
+        makerTokenAmounts = new uint256[](numSamples);
+        IBalancerV2Vault.FundManagement memory swapFunds =
+            _createSwapFunds();
+
+        for (uint256 i = 0; i < numSamples; i++) {
+            IBalancerV2Vault.BatchSwapStep[] memory swapSteps =
+                _createSwapSteps(poolInfo, takerTokenAmounts[i]);
+
+            try
+                // For sells we specify the takerToken which is what the vault will receive from the trade
+                vault.queryBatchSwap(IBalancerV2Vault.SwapKind.GIVEN_IN, swapSteps, swapAssets, swapFunds)
+            // amounts represent pool balance deltas from the swap (incoming balance, outgoing balance)
+            returns (int256[] memory amounts) {
+                // Outgoing balance is negative so we need to flip the sign
+                int256 amountOutFromPool = amounts[1] * -1;
+                if (amountOutFromPool <= 0) {
+                    break;
+                }
+                makerTokenAmounts[i] = uint256(amountOutFromPool);
+            } catch (bytes memory) {
+                // Swallow failures, leaving all results as zero.
+                break;
+            }
+        }
+    }
+
+    /// @dev Sample buy quotes from Balancer V2.
+    /// @param poolInfo Struct with pool related data
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromBalancerV2(
+        BalancerV2PoolInfo memory poolInfo,
+        address takerToken,
+        address makerToken,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        returns (uint256[] memory takerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        IBalancerV2Vault vault = IBalancerV2Vault(poolInfo.vault);
+        IAsset[] memory swapAssets = new IAsset[](2);
+        swapAssets[0] = IAsset(takerToken);
+        swapAssets[1] = IAsset(makerToken);
+
+        uint256 numSamples = makerTokenAmounts.length;
+        takerTokenAmounts = new uint256[](numSamples);
+        IBalancerV2Vault.FundManagement memory swapFunds =
+            _createSwapFunds();
+
+        for (uint256 i = 0; i < numSamples; i++) {
+            IBalancerV2Vault.BatchSwapStep[] memory swapSteps =
+                _createSwapSteps(poolInfo, makerTokenAmounts[i]);
+
+            try
+                // For buys we specify the makerToken which is what taker will receive from the trade
+                vault.queryBatchSwap(IBalancerV2Vault.SwapKind.GIVEN_OUT, swapSteps, swapAssets, swapFunds)
+            returns (int256[] memory amounts) {
+                int256 amountIntoPool = amounts[0];
+                if (amountIntoPool <= 0) {
+                    break;
+                }
+                takerTokenAmounts[i] = uint256(amountIntoPool);
+            } catch (bytes memory) {
+                // Swallow failures, leaving all results as zero.
+                break;
+            }
+        }
+    }
+
+    function _createSwapSteps(
+        BalancerV2PoolInfo memory poolInfo,
+        uint256 amount
+    ) private pure returns (IBalancerV2Vault.BatchSwapStep[] memory) {
+        IBalancerV2Vault.BatchSwapStep[] memory swapSteps =
+            new IBalancerV2Vault.BatchSwapStep[](1);
+        swapSteps[0] = IBalancerV2Vault.BatchSwapStep({
+            poolId: poolInfo.poolId,
+            assetInIndex: 0,
+            assetOutIndex: 1,
+            amount: amount,
+            userData: ""
+        });
+
+        return swapSteps;
+    }
+
+    function _createSwapFunds()
+        private
+        view
+        returns (IBalancerV2Vault.FundManagement memory)
+    {
+        return
+            IBalancerV2Vault.FundManagement({
+                sender: address(this),
+                fromInternalBalance: false,
+                recipient: payable(address(this)),
+                toInternalBalance: false
+            });
+    }
+}

packages/asset-swapper/contracts/src/BancorSampler.sol

@@ -22,16 +22,15 @@ pragma experimental ABIEncoderV2;
 
 import "./interfaces/IBancor.sol";
 
-contract DeploymentConstants {}
+contract CompilerHack {}
 
-contract BancorSampler is DeploymentConstants
-{
+contract BancorSampler is CompilerHack {
 
     /// @dev Base gas limit for Bancor calls.
     uint256 constant private BANCOR_CALL_GAS = 300e3; // 300k
 
     struct BancorSamplerOpts {
-        address registry;
+        IBancorRegistry registry;
         address[][] paths;
     }
 
@@ -112,7 +111,7 @@ contract BancorSampler is DeploymentConstants
         view
         returns (address bancorNetwork, address[] memory path)
     {
-        bancorNetwork = _getBancorNetwork(opts.registry);
+        bancorNetwork = opts.registry.getAddress(opts.registry.BANCOR_NETWORK());
         if (opts.paths.length == 0) {
             return (bancorNetwork, path);
         }
@@ -140,13 +139,4 @@ contract BancorSampler is DeploymentConstants
             }
         }
     }
-
-    function _getBancorNetwork(address registry)
-        private
-        view
-        returns (address)
-    {
-        IBancorRegistry registry = IBancorRegistry(registry);
-        return registry.getAddress(registry.BANCOR_NETWORK());
-    }
 }

packages/asset-swapper/contracts/src/ERC20BridgeSampler.sol

@@ -21,12 +21,14 @@ pragma solidity ^0.6;
 pragma experimental ABIEncoderV2;
 
 import "./BalancerSampler.sol";
+import "./BalancerV2Sampler.sol";
 import "./BancorSampler.sol";
 import "./CurveSampler.sol";
 import "./DODOSampler.sol";
 import "./DODOV2Sampler.sol";
 import "./Eth2DaiSampler.sol";
 import "./KyberSampler.sol";
+import "./KyberDmmSampler.sol";
 import "./LiquidityProviderSampler.sol";
 import "./MakerPSMSampler.sol";
 import "./MultiBridgeSampler.sol";
@@ -38,17 +40,20 @@ import "./SmoothySampler.sol";
 import "./TwoHopSampler.sol";
 import "./UniswapSampler.sol";
 import "./UniswapV2Sampler.sol";
+import "./UniswapV3Sampler.sol";
 import "./UtilitySampler.sol";
 
 
 contract ERC20BridgeSampler is
     BalancerSampler,
+    BalancerV2Sampler,
     BancorSampler,
     CurveSampler,
     DODOSampler,
     DODOV2Sampler,
     Eth2DaiSampler,
     KyberSampler,
+    KyberDmmSampler,
     LiquidityProviderSampler,
     MakerPSMSampler,
     MStableSampler,
@@ -60,6 +65,7 @@ contract ERC20BridgeSampler is
     TwoHopSampler,
     UniswapSampler,
     UniswapV2Sampler,
+    UniswapV3Sampler,
     UtilitySampler
 {
 
@@ -73,7 +79,6 @@ contract ERC20BridgeSampler is
     /// @return callResults ABI-encoded results data for each call.
     function batchCall(bytes[] calldata callDatas)
         external
-        view
         returns (CallResults[] memory callResults)
     {
         callResults = new CallResults[](callDatas.length);
@@ -82,7 +87,7 @@ contract ERC20BridgeSampler is
             if (callDatas[i].length == 0) {
                 continue;
             }
-            (callResults[i].success, callResults[i].data) = address(this).staticcall(callDatas[i]);
+            (callResults[i].success, callResults[i].data) = address(this).call(callDatas[i]);
         }
     }
 }

packages/asset-swapper/contracts/src/KyberDmmSampler.sol

@@ -0,0 +1,159 @@
+// 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;
+pragma experimental ABIEncoderV2;
+
+interface IKyberDmmFactory {
+
+    function getPoolAtIndex(address token0, address token1, uint256 index)
+        external
+        view
+        returns (address);
+}
+
+interface IKyberDmmRouter {
+
+    function factory() external view returns (address);
+
+    function getAmountsOut(uint256 amountIn, address[] calldata pools, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts);
+
+    function getAmountsIn(uint256 amountOut, address[] calldata pools, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts);
+}
+
+
+
+contract KyberDmmSampler
+{
+    /// @dev Gas limit for KyberDmm calls.
+    uint256 constant private KYBER_DMM_CALL_GAS = 150e3; // 150k
+
+    /// @dev Sample sell quotes from KyberDmm.
+    /// @param router Router to look up tokens and amounts
+    /// @param path Token route. Should be takerToken -> makerToken
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return pools The pool addresses involved in the multi path trade
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromKyberDmm(
+        address router,
+        address[] memory path,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (address[] memory pools, uint256[] memory makerTokenAmounts)
+    {
+        uint256 numSamples = takerTokenAmounts.length;
+        makerTokenAmounts = new uint256[](numSamples);
+        pools = _getKyberDmmPools(router, path);
+        if (pools.length == 0) {
+            return (pools, makerTokenAmounts);
+        }
+        for (uint256 i = 0; i < numSamples; i++) {
+            try
+                IKyberDmmRouter(router).getAmountsOut
+                    {gas: KYBER_DMM_CALL_GAS}
+                    (takerTokenAmounts[i], pools, path)
+                returns (uint256[] memory amounts)
+            {
+                makerTokenAmounts[i] = amounts[path.length - 1];
+                // Break early if there are 0 amounts
+                if (makerTokenAmounts[i] == 0) {
+                    break;
+                }
+            } catch (bytes memory) {
+                // Swallow failures, leaving all results as zero.
+                break;
+            }
+        }
+    }
+
+    /// @dev Sample buy quotes from KyberDmm.
+    /// @param router Router to look up tokens and amounts
+    /// @param path Token route. Should be takerToken -> makerToken.
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return pools The pool addresses involved in the multi path trade
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromKyberDmm(
+        address router,
+        address[] memory path,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        view
+        returns (address[] memory pools, uint256[] memory takerTokenAmounts)
+    {
+        uint256 numSamples = makerTokenAmounts.length;
+        takerTokenAmounts = new uint256[](numSamples);
+        pools = _getKyberDmmPools(router, path);
+        if (pools.length == 0) {
+            return (pools, takerTokenAmounts);
+        }
+        for (uint256 i = 0; i < numSamples; i++) {
+            try
+                IKyberDmmRouter(router).getAmountsIn
+                    {gas: KYBER_DMM_CALL_GAS}
+                    (makerTokenAmounts[i], pools, path)
+                returns (uint256[] memory amounts)
+            {
+                takerTokenAmounts[i] = amounts[0];
+                // Break early if there are 0 amounts
+                if (takerTokenAmounts[i] == 0) {
+                    break;
+                }
+            } catch (bytes memory) {
+                // Swallow failures, leaving all results as zero.
+                break;
+            }
+        }
+    }
+
+    function _getKyberDmmPools(
+        address router,
+        address[] memory path
+    )
+        private
+        view
+        returns (address[] memory pools)
+    {
+        pools = new address[](path.length - 1);
+        IKyberDmmFactory factory = IKyberDmmFactory(IKyberDmmRouter(router).factory());
+        for (uint256 i = 0; i < pools.length; i++) {
+            // Currently only supporting the first pool found at the index
+            try
+                factory.getPoolAtIndex
+                    {gas: KYBER_DMM_CALL_GAS}
+                    (path[i], path[i + 1], 0)
+                returns (address pool)
+            {
+                pools[i] = pool;
+            } catch (bytes memory) {
+                return new address[](0);
+            }
+        }
+    }
+}

packages/asset-swapper/contracts/src/MStableSampler.sol

@@ -49,6 +49,7 @@ contract MStableSampler is
         view
         returns (uint256[] memory makerTokenAmounts)
     {
+        _assertValidPair(makerToken, takerToken);
         // Initialize array of maker token amounts.
         uint256 numSamples = takerTokenAmounts.length;
         makerTokenAmounts = new uint256[](numSamples);
@@ -58,7 +59,7 @@ contract MStableSampler is
                 IMStable(router).getSwapOutput
                     {gas: DEFAULT_CALL_GAS}
                     (takerToken, makerToken, takerTokenAmounts[i])
-                returns (bool, string memory, uint256 amount)
+                returns (uint256 amount)
             {
                 makerTokenAmounts[i] = amount;
                 // Break early if there are 0 amounts

packages/asset-swapper/contracts/src/TwoHopSampler.sol

@@ -37,7 +37,6 @@ contract TwoHopSampler {
         uint256 sellAmount
     )
         public
-        view
         returns (
             HopInfo memory firstHop,
             HopInfo memory secondHop,
@@ -47,7 +46,7 @@ contract TwoHopSampler {
         uint256 intermediateAssetAmount = 0;
         for (uint256 i = 0; i != firstHopCalls.length; ++i) {
             firstHopCalls[i].writeUint256(firstHopCalls[i].length - 32, sellAmount);
-            (bool didSucceed, bytes memory returnData) = address(this).staticcall(firstHopCalls[i]);
+            (bool didSucceed, bytes memory returnData) = address(this).call(firstHopCalls[i]);
             if (didSucceed) {
                 uint256 amount = returnData.readUint256(returnData.length - 32);
                 if (amount > intermediateAssetAmount) {
@@ -62,7 +61,7 @@ contract TwoHopSampler {
         }
         for (uint256 j = 0; j != secondHopCalls.length; ++j) {
             secondHopCalls[j].writeUint256(secondHopCalls[j].length - 32, intermediateAssetAmount);
-            (bool didSucceed, bytes memory returnData) = address(this).staticcall(secondHopCalls[j]);
+            (bool didSucceed, bytes memory returnData) = address(this).call(secondHopCalls[j]);
             if (didSucceed) {
                 uint256 amount = returnData.readUint256(returnData.length - 32);
                 if (amount > buyAmount) {
@@ -80,7 +79,6 @@ contract TwoHopSampler {
         uint256 buyAmount
     )
         public
-        view
         returns (
             HopInfo memory firstHop,
             HopInfo memory secondHop,
@@ -91,7 +89,7 @@ contract TwoHopSampler {
         uint256 intermediateAssetAmount = uint256(-1);
         for (uint256 j = 0; j != secondHopCalls.length; ++j) {
             secondHopCalls[j].writeUint256(secondHopCalls[j].length - 32, buyAmount);
-            (bool didSucceed, bytes memory returnData) = address(this).staticcall(secondHopCalls[j]);
+            (bool didSucceed, bytes memory returnData) = address(this).call(secondHopCalls[j]);
             if (didSucceed) {
                 uint256 amount = returnData.readUint256(returnData.length - 32);
                 if (
@@ -109,7 +107,7 @@ contract TwoHopSampler {
         }
         for (uint256 i = 0; i != firstHopCalls.length; ++i) {
             firstHopCalls[i].writeUint256(firstHopCalls[i].length - 32, intermediateAssetAmount);
-            (bool didSucceed, bytes memory returnData) = address(this).staticcall(firstHopCalls[i]);
+            (bool didSucceed, bytes memory returnData) = address(this).call(firstHopCalls[i]);
             if (didSucceed) {
                 uint256 amount = returnData.readUint256(returnData.length - 32);
                 if (

packages/asset-swapper/contracts/src/UniswapV3Sampler.sol

@@ -0,0 +1,313 @@
+// 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;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+
+interface IUniswapV3Quoter {
+    function factory()
+        external
+        view
+        returns (IUniswapV3Factory factory);
+    function quoteExactInput(bytes memory path, uint256 amountIn)
+        external
+        returns (uint256 amountOut);
+    function quoteExactOutput(bytes memory path, uint256 amountOut)
+        external
+        returns (uint256 amountIn);
+}
+
+interface IUniswapV3Factory {
+    function getPool(IERC20TokenV06 a, IERC20TokenV06 b, uint24 fee)
+        external
+        view
+        returns (IUniswapV3Pool pool);
+}
+
+interface IUniswapV3Pool {
+    function token0() external view returns (IERC20TokenV06);
+    function token1() external view returns (IERC20TokenV06);
+    function fee() external view returns (uint24);
+}
+
+contract UniswapV3Sampler
+{
+    /// @dev Gas limit for UniswapV3 calls. This is 100% a guess.
+    uint256 constant private QUOTE_GAS = 300e3;
+
+    /// @dev Sample sell quotes from UniswapV3.
+    /// @param quoter UniswapV3 Quoter contract.
+    /// @param path Token route. Should be takerToken -> makerToken
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return uniswapPaths The encoded uniswap path for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromUniswapV3(
+        IUniswapV3Quoter quoter,
+        IERC20TokenV06[] memory path,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        returns (
+            bytes[] memory uniswapPaths,
+            uint256[] memory makerTokenAmounts
+        )
+    {
+        IUniswapV3Pool[][] memory poolPaths =
+            _getValidPoolPaths(quoter.factory(), path, 0);
+
+        makerTokenAmounts = new uint256[](takerTokenAmounts.length);
+        uniswapPaths = new bytes[](takerTokenAmounts.length);
+
+        for (uint256 i = 0; i < takerTokenAmounts.length; ++i) {
+            // Pick the best result from all the paths.
+            bytes memory topUniswapPath;
+            uint256 topBuyAmount = 0;
+            for (uint256 j = 0; j < poolPaths.length; ++j) {
+                bytes memory uniswapPath = _toUniswapPath(path, poolPaths[j]);
+                try
+                    quoter.quoteExactInput
+                        { gas: QUOTE_GAS }
+                        (uniswapPath, takerTokenAmounts[i])
+                        returns (uint256 buyAmount)
+                {
+                    if (topBuyAmount <= buyAmount) {
+                        topBuyAmount = buyAmount;
+                        topUniswapPath = uniswapPath;
+                    }
+                } catch { }
+            }
+            // Break early if we can't complete the buys.
+            if (topBuyAmount == 0) {
+                break;
+            }
+            makerTokenAmounts[i] = topBuyAmount;
+            uniswapPaths[i] = topUniswapPath;
+        }
+    }
+
+    /// @dev Sample buy quotes from UniswapV3.
+    /// @param quoter UniswapV3 Quoter contract.
+    /// @param path Token route. Should be takerToken -> makerToken.
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return uniswapPaths The encoded uniswap path for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromUniswapV3(
+        IUniswapV3Quoter quoter,
+        IERC20TokenV06[] memory path,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        returns (
+            bytes[] memory uniswapPaths,
+            uint256[] memory takerTokenAmounts
+        )
+    {
+        IUniswapV3Pool[][] memory poolPaths =
+            _getValidPoolPaths(quoter.factory(), path, 0);
+        IERC20TokenV06[] memory reversedPath = _reverseTokenPath(path);
+
+        takerTokenAmounts = new uint256[](makerTokenAmounts.length);
+        uniswapPaths = new bytes[](makerTokenAmounts.length);
+
+        for (uint256 i = 0; i < makerTokenAmounts.length; ++i) {
+            // Pick the best result from all the paths.
+            bytes memory topUniswapPath;
+            uint256 topSellAmount = 0;
+            for (uint256 j = 0; j < poolPaths.length; ++j) {
+                // quoter requires path to be reversed for buys.
+                bytes memory uniswapPath = _toUniswapPath(
+                    reversedPath,
+                    _reversePoolPath(poolPaths[j])
+                );
+                try
+                    quoter.quoteExactOutput
+                        { gas: QUOTE_GAS }
+                        (uniswapPath, makerTokenAmounts[i])
+                        returns (uint256 sellAmount)
+                {
+                    if (topSellAmount == 0 || topSellAmount >= sellAmount) {
+                        topSellAmount = sellAmount;
+                        // But the output path should still be encoded for sells.
+                        topUniswapPath = _toUniswapPath(path, poolPaths[j]);
+                    }
+                } catch {}
+            }
+            // Break early if we can't complete the buys.
+            if (topSellAmount == 0) {
+                break;
+            }
+            takerTokenAmounts[i] = topSellAmount;
+            uniswapPaths[i] = topUniswapPath;
+        }
+    }
+
+    function _getValidPoolPaths(
+        IUniswapV3Factory factory,
+        IERC20TokenV06[] memory tokenPath,
+        uint256 startIndex
+    )
+        private
+        view
+        returns (IUniswapV3Pool[][] memory poolPaths)
+    {
+        require(
+            tokenPath.length - startIndex >= 2,
+            "UniswapV3Sampler/tokenPath too short"
+        );
+        uint24[3] memory validPoolFees = [
+            // The launch pool fees. Could get hairier if they add more.
+            uint24(0.0005e6),
+            uint24(0.003e6),
+            uint24(0.01e6)
+        ];
+        IUniswapV3Pool[] memory validPools =
+            new IUniswapV3Pool[](validPoolFees.length);
+        uint256 numValidPools = 0;
+        {
+            IERC20TokenV06 inputToken = tokenPath[startIndex];
+            IERC20TokenV06 outputToken = tokenPath[startIndex + 1];
+            for (uint256 i = 0; i < validPoolFees.length; ++i) {
+                IUniswapV3Pool pool =
+                factory.getPool(inputToken, outputToken, validPoolFees[i]);
+                if (_isValidPool(pool)) {
+                    validPools[numValidPools++] = pool;
+                }
+            }
+        }
+        if (numValidPools == 0) {
+            // No valid pools for this hop.
+            return poolPaths;
+        }
+        if (startIndex + 2 == tokenPath.length) {
+            // End of path.
+            poolPaths = new IUniswapV3Pool[][](numValidPools);
+            for (uint256 i = 0; i < numValidPools; ++i) {
+                poolPaths[i] = new IUniswapV3Pool[](1);
+                poolPaths[i][0] = validPools[i];
+            }
+            return poolPaths;
+        }
+        // Get paths for subsequent hops.
+        IUniswapV3Pool[][] memory subsequentPoolPaths =
+            _getValidPoolPaths(factory, tokenPath, startIndex + 1);
+        if (subsequentPoolPaths.length == 0) {
+            // Could not complete the path.
+            return poolPaths;
+        }
+        // Combine our pools with the next hop paths.
+        poolPaths = new IUniswapV3Pool[][](
+            numValidPools * subsequentPoolPaths.length
+        );
+        for (uint256 i = 0; i < numValidPools; ++i) {
+            for (uint256 j = 0; j < subsequentPoolPaths.length; ++j) {
+                uint256 o = i * subsequentPoolPaths.length + j;
+                // Prepend pool to the subsequent path.
+                poolPaths[o] =
+                    new IUniswapV3Pool[](1 + subsequentPoolPaths[j].length);
+                poolPaths[o][0] = validPools[i];
+                for (uint256 k = 0; k < subsequentPoolPaths[j].length; ++k) {
+                    poolPaths[o][1 + k] = subsequentPoolPaths[j][k];
+                }
+            }
+        }
+        return poolPaths;
+    }
+
+    function _reverseTokenPath(IERC20TokenV06[] memory tokenPath)
+        private
+        returns (IERC20TokenV06[] memory reversed)
+    {
+        reversed = new IERC20TokenV06[](tokenPath.length);
+        for (uint256 i = 0; i < tokenPath.length; ++i) {
+            reversed[i] = tokenPath[tokenPath.length - i - 1];
+        }
+    }
+
+    function _reversePoolPath(IUniswapV3Pool[] memory poolPath)
+        private
+        returns (IUniswapV3Pool[] memory reversed)
+    {
+        reversed = new IUniswapV3Pool[](poolPath.length);
+        for (uint256 i = 0; i < poolPath.length; ++i) {
+            reversed[i] = poolPath[poolPath.length - i - 1];
+        }
+    }
+
+    function _isValidPool(IUniswapV3Pool pool)
+        private
+        view
+        returns (bool isValid)
+    {
+        // Check if it has been deployed.
+        {
+            uint256 codeSize;
+            assembly {
+                codeSize := extcodesize(pool)
+            }
+            if (codeSize == 0) {
+                return false;
+            }
+        }
+        // Must have a balance of both tokens.
+        if (pool.token0().balanceOf(address(pool)) == 0) {
+            return false;
+        }
+        if (pool.token1().balanceOf(address(pool)) == 0) {
+            return false;
+        }
+        return true;
+    }
+
+    function _toUniswapPath(
+        IERC20TokenV06[] memory tokenPath,
+        IUniswapV3Pool[] memory poolPath
+    )
+        private
+        view
+        returns (bytes memory uniswapPath)
+    {
+        require(
+            tokenPath.length >= 2 && tokenPath.length == poolPath.length + 1,
+            "UniswapV3Sampler/invalid path lengths"
+        );
+        // Uniswap paths are tightly packed as:
+        // [token0, token0token1PairFee, token1, token1Token2PairFee, token2, ...]
+        uniswapPath = new bytes(tokenPath.length * 20 + poolPath.length * 3);
+        uint256 o;
+        assembly { o := add(uniswapPath, 32) }
+        for (uint256 i = 0; i < tokenPath.length; ++i) {
+            if (i > 0) {
+                uint24 poolFee = poolPath[i - 1].fee();
+                assembly {
+                    mstore(o, shl(232, poolFee))
+                    o := add(o, 3)
+                }
+            }
+            IERC20TokenV06 token = tokenPath[i];
+            assembly {
+                mstore(o, shl(96, token))
+                o := add(o, 20)
+            }
+        }
+    }
+}

packages/asset-swapper/contracts/src/interfaces/IMStable.sol

@@ -29,5 +29,5 @@ interface IMStable {
     )
         external
         view
-        returns (bool, string memory, uint256 output);
+        returns (uint256 swapOutput);
 }

packages/asset-swapper/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/asset-swapper",
-    "version": "6.7.0",
+    "version": "6.16.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -33,12 +33,13 @@
         "generate_contract_wrappers": "abi-gen --debug --abis  ${npm_package_config_abis} --output test/generated-wrappers --backend ethers",
         "contracts:gen": "contracts-gen generate",
         "contracts:copy": "contracts-gen copy",
-        "publish:private": "yarn build && gitpkg publish"
+        "publish:private": "yarn build && gitpkg publish",
+        "sampler-size": "jq .compilerOutput.evm.deployedBytecode.object  -- test/generated-artifacts/ERC20BridgeSampler.json | echo $(( $(wc -c) / 2 - 1 ))"
     },
     "config": {
         "publicInterfaceContracts": "ERC20BridgeSampler,BalanceChecker,FakeTaker",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
-        "abis": "./test/generated-artifacts/@(ApproximateBuys|BalanceChecker|BalancerSampler|BancorSampler|CurveSampler|DODOSampler|DODOV2Sampler|DummyLiquidityProvider|ERC20BridgeSampler|Eth2DaiSampler|FakeTaker|IBalancer|IBancor|ICurve|IEth2Dai|IKyberNetwork|IMStable|IMooniswap|IMultiBridge|IShell|ISmoothy|IUniswapExchangeQuotes|IUniswapV2Router01|KyberSampler|LiquidityProviderSampler|MStableSampler|MakerPSMSampler|MooniswapSampler|MultiBridgeSampler|NativeOrderSampler|SamplerUtils|ShellSampler|SmoothySampler|TestERC20BridgeSampler|TestNativeOrderSampler|TwoHopSampler|UniswapSampler|UniswapV2Sampler|UtilitySampler).json",
+        "abis": "./test/generated-artifacts/@(ApproximateBuys|BalanceChecker|BalancerSampler|BalancerV2Sampler|BancorSampler|CurveSampler|DODOSampler|DODOV2Sampler|DummyLiquidityProvider|ERC20BridgeSampler|Eth2DaiSampler|FakeTaker|IBalancer|IBancor|ICurve|IEth2Dai|IKyberNetwork|IMStable|IMooniswap|IMultiBridge|IShell|ISmoothy|IUniswapExchangeQuotes|IUniswapV2Router01|KyberDmmSampler|KyberSampler|LiquidityProviderSampler|MStableSampler|MakerPSMSampler|MooniswapSampler|MultiBridgeSampler|NativeOrderSampler|SamplerUtils|ShellSampler|SmoothySampler|TestERC20BridgeSampler|TestNativeOrderSampler|TwoHopSampler|UniswapSampler|UniswapV2Sampler|UniswapV3Sampler|UtilitySampler).json",
         "postpublish": {
             "assets": []
         }
@@ -57,20 +58,20 @@
         "registry": "git@github.com:0xProject/gitpkg-registry.git"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.21",
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contract-addresses": "^6.0.0",
-        "@0x/contract-wrappers": "^13.15.0",
-        "@0x/contracts-erc20": "^3.3.6",
-        "@0x/contracts-zero-ex": "^0.22.0",
-        "@0x/dev-utils": "^4.2.1",
-        "@0x/json-schemas": "^5.4.1",
-        "@0x/protocol-utils": "^1.5.0",
-        "@0x/quote-server": "^5.0.0",
-        "@0x/types": "^3.3.1",
-        "@0x/typescript-typings": "^5.1.6",
-        "@0x/utils": "^6.2.0",
-        "@0x/web3-wrapper": "^7.4.1",
+        "@0x/assert": "^3.0.27",
+        "@0x/base-contract": "^6.4.0",
+        "@0x/contract-addresses": "^6.3.0",
+        "@0x/contract-wrappers": "^13.16.3",
+        "@0x/contracts-erc20": "^3.3.10",
+        "@0x/contracts-zero-ex": "^0.24.1",
+        "@0x/dev-utils": "^4.2.7",
+        "@0x/json-schemas": "^6.1.3",
+        "@0x/protocol-utils": "^1.6.2",
+        "@0x/quote-server": "^6.0.2",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.3",
         "@balancer-labs/sor": "0.3.2",
         "@bancor/sdk": "0.2.9",
         "@ethersproject/abi": "^5.0.1",
@@ -82,26 +83,29 @@
         "axios-mock-adapter": "^1.19.0",
         "cream-sor": "^0.3.3",
         "decimal.js": "^10.2.0",
-        "ethereum-types": "^3.4.0",
-        "ethereumjs-util": "^5.1.1",
+        "ethereum-types": "^3.5.0",
+        "ethereumjs-util": "^7.0.10",
+        "fast-abi": "^0.0.2",
+        "graphql": "^15.4.0",
+        "graphql-request": "^3.4.0",
         "heartbeats": "^5.0.1",
         "lodash": "^4.17.11"
     },
     "devDependencies": {
-        "@0x/base-contract": "^6.2.18",
-        "@0x/contracts-asset-proxy": "^3.7.9",
-        "@0x/contracts-exchange": "^3.2.28",
-        "@0x/contracts-exchange-libs": "^4.3.27",
-        "@0x/contracts-gen": "^2.0.32",
-        "@0x/contracts-test-utils": "^5.3.24",
-        "@0x/contracts-utils": "^4.7.6",
+        "@0x/abi-gen": "^5.6.0",
+        "@0x/contracts-asset-proxy": "^3.7.13",
+        "@0x/contracts-exchange": "^3.2.32",
+        "@0x/contracts-exchange-libs": "^4.3.31",
+        "@0x/contracts-gen": "^2.0.38",
+        "@0x/contracts-test-utils": "^5.4.2",
+        "@0x/contracts-utils": "^4.7.10",
         "@0x/mesh-rpc-client": "^9.4.2",
-        "@0x/migrations": "^8.0.2",
-        "@0x/sol-compiler": "^4.6.1",
-        "@0x/subproviders": "^6.4.1",
+        "@0x/migrations": "^8.0.8",
+        "@0x/sol-compiler": "^4.7.3",
+        "@0x/subproviders": "^6.5.3",
         "@0x/ts-doc-gen": "^0.0.28",
-        "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.1",
+        "@0x/tslint-config": "^4.1.4",
+        "@0x/types": "^3.3.3",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",