diff --git a/contracts/zero-ex/src/constants.ts b/contracts/zero-ex/src/constants.ts
deleted file mode 100644
index 2c49072817..0000000000
--- a/contracts/zero-ex/src/constants.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-/*
- * The pseudo-token address for ETH used by `tranformERC20()`.
- */
-export const ETH_TOKEN_ADDRESS = '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee';
diff --git a/contracts/zero-ex/src/index.ts b/contracts/zero-ex/src/index.ts
index c2c9cebc48..84c5247934 100644
--- a/contracts/zero-ex/src/index.ts
+++ b/contracts/zero-ex/src/index.ts
@@ -41,6 +41,3 @@ export {
     TupleDataItem,
     StateMutability,
 } from 'ethereum-types';
-
-export * from './constants';
-export * from './transformer_data_encoders';
diff --git a/contracts/zero-ex/src/transformer_data_encoders.ts b/contracts/zero-ex/src/transformer_data_encoders.ts
deleted file mode 100644
index 00a7831f61..0000000000
--- a/contracts/zero-ex/src/transformer_data_encoders.ts
+++ /dev/null
@@ -1,187 +0,0 @@
-import { Order } from '@0x/types';
-import { AbiEncoder, BigNumber } from '@0x/utils';
-
-const ORDER_ABI_COMPONENTS = [
-    { name: 'makerAddress', type: 'address' },
-    { name: 'takerAddress', type: 'address' },
-    { name: 'feeRecipientAddress', type: 'address' },
-    { name: 'senderAddress', type: 'address' },
-    { name: 'makerAssetAmount', type: 'uint256' },
-    { name: 'takerAssetAmount', type: 'uint256' },
-    { name: 'makerFee', type: 'uint256' },
-    { name: 'takerFee', type: 'uint256' },
-    { name: 'expirationTimeSeconds', type: 'uint256' },
-    { name: 'salt', type: 'uint256' },
-    { name: 'makerAssetData', type: 'bytes' },
-    { name: 'takerAssetData', type: 'bytes' },
-    { name: 'makerFeeAssetData', type: 'bytes' },
-    { name: 'takerFeeAssetData', type: 'bytes' },
-];
-
-/**
- * ABI encoder for `FillQuoteTransformer.TransformData`
- */
-export const fillQuoteTransformerDataEncoder = AbiEncoder.create([
-    {
-        name: 'data',
-        type: 'tuple',
-        components: [
-            { name: 'side', type: 'uint8' },
-            { name: 'sellToken', type: 'address' },
-            { name: 'buyToken', type: 'address' },
-            {
-                name: 'orders',
-                type: 'tuple[]',
-                components: ORDER_ABI_COMPONENTS,
-            },
-            { name: 'signatures', type: 'bytes[]' },
-            { name: 'maxOrderFillAmounts', type: 'uint256[]' },
-            { name: 'fillAmount', type: 'uint256' },
-        ],
-    },
-]);
-
-/**
- * Market operation for `FillQuoteTransformerData`.
- */
-export enum FillQuoteTransformerSide {
-    Sell,
-    Buy,
-}
-
-/**
- * `FillQuoteTransformer.TransformData`
- */
-export interface FillQuoteTransformerData {
-    side: FillQuoteTransformerSide;
-    sellToken: string;
-    buyToken: string;
-    orders: Array<Exclude<Order, ['signature', 'exchangeAddress', 'chainId']>>;
-    signatures: string[];
-    maxOrderFillAmounts: BigNumber[];
-    fillAmount: BigNumber;
-}
-
-/**
- * ABI-encode a `FillQuoteTransformer.TransformData` type.
- */
-export function encodeFillQuoteTransformerData(data: FillQuoteTransformerData): string {
-    return fillQuoteTransformerDataEncoder.encode([data]);
-}
-
-/**
- * ABI-decode a `FillQuoteTransformer.TransformData` type.
- */
-export function decodeFillQuoteTransformerData(encoded: string): FillQuoteTransformerData {
-    return fillQuoteTransformerDataEncoder.decode(encoded).data;
-}
-
-/**
- * ABI encoder for `WethTransformer.TransformData`
- */
-export const wethTransformerDataEncoder = AbiEncoder.create([
-    {
-        name: 'data',
-        type: 'tuple',
-        components: [{ name: 'token', type: 'address' }, { name: 'amount', type: 'uint256' }],
-    },
-]);
-
-/**
- * `WethTransformer.TransformData`
- */
-export interface WethTransformerData {
-    token: string;
-    amount: BigNumber;
-}
-
-/**
- * ABI-encode a `WethTransformer.TransformData` type.
- */
-export function encodeWethTransformerData(data: WethTransformerData): string {
-    return wethTransformerDataEncoder.encode([data]);
-}
-
-/**
- * ABI-decode a `WethTransformer.TransformData` type.
- */
-export function decodeWethTransformerData(encoded: string): WethTransformerData {
-    return wethTransformerDataEncoder.decode(encoded).data;
-}
-
-/**
- * ABI encoder for `PayTakerTransformer.TransformData`
- */
-export const payTakerTransformerDataEncoder = AbiEncoder.create([
-    {
-        name: 'data',
-        type: 'tuple',
-        components: [{ name: 'tokens', type: 'address[]' }, { name: 'amounts', type: 'uint256[]' }],
-    },
-]);
-
-/**
- * `PayTakerTransformer.TransformData`
- */
-export interface PayTakerTransformerData {
-    tokens: string[];
-    amounts: BigNumber[];
-}
-
-/**
- * ABI-encode a `PayTakerTransformer.TransformData` type.
- */
-export function encodePayTakerTransformerData(data: PayTakerTransformerData): string {
-    return payTakerTransformerDataEncoder.encode([data]);
-}
-
-/**
- * ABI-decode a `PayTakerTransformer.TransformData` type.
- */
-export function decodePayTakerTransformerData(encoded: string): PayTakerTransformerData {
-    return payTakerTransformerDataEncoder.decode(encoded).data;
-}
-
-/**
- * ABI encoder for `PayTakerTransformer.TransformData`
- */
-export const affiliateFeeTransformerDataEncoder = AbiEncoder.create({
-    name: 'data',
-    type: 'tuple',
-    components: [
-        {
-            name: 'fees',
-            type: 'tuple[]',
-            components: [
-                { name: 'token', type: 'address' },
-                { name: 'amount', type: 'uint256' },
-                { name: 'recipient', type: 'address' },
-            ],
-        },
-    ],
-});
-
-/**
- * `AffiliateFeeTransformer.TransformData`
- */
-export interface AffiliateFeeTransformerData {
-    fees: Array<{
-        token: string;
-        amount: BigNumber;
-        recipient: string;
-    }>;
-}
-
-/**
- * ABI-encode a `AffiliateFeeTransformer.TransformData` type.
- */
-export function encodeAffiliateFeeTransformerData(data: AffiliateFeeTransformerData): string {
-    return affiliateFeeTransformerDataEncoder.encode(data);
-}
-
-/**
- * ABI-decode a `AffiliateFeeTransformer.TransformData` type.
- */
-export function decodeAffiliateFeeTransformerData(encoded: string): AffiliateFeeTransformerData {
-    return affiliateFeeTransformerDataEncoder.decode(encoded).data;
-}
diff --git a/contracts/zero-ex/test/features/transform_erc20_test.ts b/contracts/zero-ex/test/features/transform_erc20_test.ts
index f1dcf79b70..57f0364cc5 100644
--- a/contracts/zero-ex/test/features/transform_erc20_test.ts
+++ b/contracts/zero-ex/test/features/transform_erc20_test.ts
@@ -8,9 +8,9 @@ import {
     randomAddress,
     verifyEventsFromLogs,
 } from '@0x/contracts-test-utils';
+import { ETH_TOKEN_ADDRESS } from '@0x/order-utils';
 import { AbiEncoder, hexUtils, OwnableRevertErrors, ZeroExRevertErrors } from '@0x/utils';
 
-import { ETH_TOKEN_ADDRESS } from '../../src/constants';
 import { artifacts } from '../artifacts';
 import { abis } from '../utils/abis';
 import { fullMigrateAsync } from '../utils/migration';
diff --git a/contracts/zero-ex/test/transformers/affiliate_fee_transformer_test.ts b/contracts/zero-ex/test/transformers/affiliate_fee_transformer_test.ts
index a88eca5486..1b2b122afe 100644
--- a/contracts/zero-ex/test/transformers/affiliate_fee_transformer_test.ts
+++ b/contracts/zero-ex/test/transformers/affiliate_fee_transformer_test.ts
@@ -1,9 +1,8 @@
 import { blockchainTests, constants, expect, getRandomInteger, randomAddress } from '@0x/contracts-test-utils';
+import { ETH_TOKEN_ADDRESS, encodeAffiliateFeeTransformerData } from '@0x/order-utils';
 import { BigNumber, hexUtils } from '@0x/utils';
 import * as _ from 'lodash';
 
-import { ETH_TOKEN_ADDRESS } from '../../src/constants';
-import { encodeAffiliateFeeTransformerData } from '../../src/transformer_data_encoders';
 import { artifacts } from '../artifacts';
 import {
     AffiliateFeeTransformerContract,
diff --git a/contracts/zero-ex/test/transformers/fill_quote_transformer_test.ts b/contracts/zero-ex/test/transformers/fill_quote_transformer_test.ts
index 34082f359c..7fcb1da8a2 100644
--- a/contracts/zero-ex/test/transformers/fill_quote_transformer_test.ts
+++ b/contracts/zero-ex/test/transformers/fill_quote_transformer_test.ts
@@ -7,16 +7,17 @@ import {
     Numberish,
     randomAddress,
 } from '@0x/contracts-test-utils';
-import { assetDataUtils } from '@0x/order-utils';
+import {
+    assetDataUtils,
+    encodeFillQuoteTransformerData,
+    FillQuoteTransformerData,
+    FillQuoteTransformerSide,
+    ETH_TOKEN_ADDRESS,
+} from '@0x/order-utils';
 import { Order } from '@0x/types';
 import { BigNumber, hexUtils, ZeroExRevertErrors } from '@0x/utils';
 import * as _ from 'lodash';
 
-import {
-    encodeFillQuoteTransformerData,
-    FillQuoteTransformerData,
-    FillQuoteTransformerSide,
-} from '../../src/transformer_data_encoders';
 import { artifacts } from '../artifacts';
 import {
     FillQuoteTransformerContract,
diff --git a/contracts/zero-ex/test/transformers/pay_taker_transformer_test.ts b/contracts/zero-ex/test/transformers/pay_taker_transformer_test.ts
index 31f1edfdd2..f7570e7c62 100644
--- a/contracts/zero-ex/test/transformers/pay_taker_transformer_test.ts
+++ b/contracts/zero-ex/test/transformers/pay_taker_transformer_test.ts
@@ -1,9 +1,8 @@
 import { blockchainTests, constants, expect, getRandomInteger, randomAddress } from '@0x/contracts-test-utils';
+import { encodePayTakerTransformerData, ETH_TOKEN_ADDRESS } from '@0x/order-utils';
 import { BigNumber, hexUtils } from '@0x/utils';
 import * as _ from 'lodash';
 
-import { ETH_TOKEN_ADDRESS } from '../../src/constants';
-import { encodePayTakerTransformerData } from '../../src/transformer_data_encoders';
 import { artifacts } from '../artifacts';
 import { PayTakerTransformerContract, TestMintableERC20TokenContract, TestTransformerHostContract } from '../wrappers';
 
diff --git a/contracts/zero-ex/test/transformers/weth_transformer_test.ts b/contracts/zero-ex/test/transformers/weth_transformer_test.ts
index cda6809bee..fbabe1ddcc 100644
--- a/contracts/zero-ex/test/transformers/weth_transformer_test.ts
+++ b/contracts/zero-ex/test/transformers/weth_transformer_test.ts
@@ -2,8 +2,7 @@ import { blockchainTests, constants, expect, getRandomInteger, randomAddress } f
 import { BigNumber, ZeroExRevertErrors } from '@0x/utils';
 import * as _ from 'lodash';
 
-import { ETH_TOKEN_ADDRESS } from '../../src/constants';
-import { encodeWethTransformerData } from '../../src/transformer_data_encoders';
+import { encodeWethTransformerData, ETH_TOKEN_ADDRESS } from '@0x/order-utils';
 import { artifacts } from '../artifacts';
 import { TestWethContract, TestWethTransformerHostContract, WethTransformerContract } from '../wrappers';