diff --git a/src.ts/utils/index.ts b/src.ts/utils/index.ts
index d7372faa6..8f7c8aa36 100644
--- a/src.ts/utils/index.ts
+++ b/src.ts/utils/index.ts
@@ -6,8 +6,8 @@
 import { getAddress, getContractAddress, getIcapAddress } from './address';
 import { AbiCoder, defaultAbiCoder, formatSignature, formatParamType, parseSignature, parseParamType } from './abi-coder';
 import * as base64 from './base64';
-import { BigNumber, bigNumberify } from './bignumber';
-import { arrayify, concat, hexlify, joinSignature, padZeros, splitSignature, stripZeros } from './bytes';
+import { BigNumber, bigNumberify, ConstantNegativeOne, ConstantZero, ConstantOne, ConstantTwo, ConstantWeiPerEther } from './bignumber';
+import { AddressZero, arrayify, concat, HashZero, hexDataSlice, hexDataLength, hexlify, hexStripZeros, hexZeroPad, joinSignature, padZeros, splitSignature, stripZeros } from './bytes';
 import { hashMessage, id, namehash } from './hash';
 import { keccak256 } from './keccak256';
 import { sha256 } from './sha2';
@@ -28,6 +28,16 @@ import * as errors from './errors';
 // NFKC (composed)
 const etherSymbol = '\u039e';
 
+const constants = {
+    AddressZero: AddressZero,
+    HashZero: HashZero,
+    NegativeOne: ConstantNegativeOne,
+    Zero: ConstantZero,
+    One: ConstantOne,
+    Two: ConstantTwo,
+    WeiPerEther: ConstantWeiPerEther
+};
+
 export {
     AbiCoder,
     defaultAbiCoder,
@@ -36,6 +46,8 @@ export {
     parseSignature,
     parseParamType,
 
+    constants,
+
     RLP,
 
     fetchJson,
@@ -59,6 +71,10 @@ export {
     BigNumber,
 
     hexlify,
+    hexStripZeros,
+    hexZeroPad,
+    hexDataLength,
+    hexDataSlice,
 
     toUtf8Bytes,
     toUtf8String,
@@ -101,6 +117,8 @@ export default {
     parseSignature,
     parseParamType,
 
+    constants,
+
     RLP,
 
     fetchJson,
@@ -124,6 +142,10 @@ export default {
     BigNumber,
 
     hexlify,
+    hexStripZeros,
+    hexZeroPad,
+    hexDataLength,
+    hexDataSlice,
 
     toUtf8Bytes,
     toUtf8String,
diff --git a/utils/index.js b/utils/index.js
index 9bcd113bc..e81be2c11 100644
--- a/utils/index.js
+++ b/utils/index.js
@@ -28,7 +28,11 @@ exports.bigNumberify = bignumber_1.bigNumberify;
 var bytes_1 = require("./bytes");
 exports.arrayify = bytes_1.arrayify;
 exports.concat = bytes_1.concat;
+exports.hexDataSlice = bytes_1.hexDataSlice;
+exports.hexDataLength = bytes_1.hexDataLength;
 exports.hexlify = bytes_1.hexlify;
+exports.hexStripZeros = bytes_1.hexStripZeros;
+exports.hexZeroPad = bytes_1.hexZeroPad;
 exports.joinSignature = bytes_1.joinSignature;
 exports.padZeros = bytes_1.padZeros;
 exports.splitSignature = bytes_1.splitSignature;
@@ -74,11 +78,22 @@ exports.errors = errors;
 // NFKC (composed)
 var etherSymbol = '\u039e';
 exports.etherSymbol = etherSymbol;
+var constants = {
+    AddressZero: bytes_1.AddressZero,
+    HashZero: bytes_1.HashZero,
+    NegativeOne: bignumber_1.ConstantNegativeOne,
+    Zero: bignumber_1.ConstantZero,
+    One: bignumber_1.ConstantOne,
+    Two: bignumber_1.ConstantTwo,
+    WeiPerEther: bignumber_1.ConstantWeiPerEther
+};
+exports.constants = constants;
 exports.default = {
     AbiCoder: abi_coder_1.AbiCoder,
     defaultAbiCoder: abi_coder_1.defaultAbiCoder,
     parseSignature: abi_coder_1.parseSignature,
     parseParamType: abi_coder_1.parseParamType,
+    constants: constants,
     RLP: RLP,
     fetchJson: web_1.fetchJson,
     defineReadOnly: properties_1.defineReadOnly,
@@ -94,6 +109,10 @@ exports.default = {
     bigNumberify: bignumber_1.bigNumberify,
     BigNumber: bignumber_1.BigNumber,
     hexlify: bytes_1.hexlify,
+    hexStripZeros: bytes_1.hexStripZeros,
+    hexZeroPad: bytes_1.hexZeroPad,
+    hexDataLength: bytes_1.hexDataLength,
+    hexDataSlice: bytes_1.hexDataSlice,
     toUtf8Bytes: utf8_1.toUtf8Bytes,
     toUtf8String: utf8_1.toUtf8String,
     hashMessage: hash_1.hashMessage,