4 files changed, 4 insertions, 40 deletions
diff --git a/packages/assert/package.json b/packages/assert/package.json
index 800207ae6..d69241f60 100644
--- a/packages/assert/package.json
+++ b/packages/assert/package.json
@@ -22,6 +22,9 @@
     "url": "https://github.com/0xProject/0x.js/issues"
   },
   "homepage": "https://github.com/0xProject/0x.js/packages/assert/README.md",
+  "dependencies": {
+    "@0xProject/utils": "^0.0.1"
+  },
   "devDependencies": {
     "@0xproject/tslint-config": "^0.2.1",
     "@types/lodash": "^4.14.86",
diff --git a/packages/assert/src/address_utils.ts b/packages/assert/src/address_utils.ts
deleted file mode 100644
index bdbcd3a89..000000000
--- a/packages/assert/src/address_utils.ts
+++ /dev/null
@@ -1,34 +0,0 @@
-import * as jsSHA3 from 'js-sha3';
-
-const BASIC_ADDRESS_REGEX = /^(0x)?[0-9a-f]{40}$/i;
-const SAME_CASE_ADDRESS_REGEX = /^(0x)?([0-9a-f]{40}|[0-9A-F]{40})$/;
-
-export const addressUtils = {
-    isChecksumAddress(address: string): boolean {
-        // Check each case
-        const unprefixedAddress = address.replace('0x', '');
-        const addressHash = jsSHA3.keccak256(unprefixedAddress.toLowerCase());
-
-        for (let i = 0; i < 40; i++) {
-            // The nth letter should be uppercase if the nth digit of casemap is 1
-            if ((parseInt(addressHash[i], 16) > 7 && unprefixedAddress[i].toUpperCase() !== unprefixedAddress[i]) ||
-                (parseInt(addressHash[i], 16) <= 7 && unprefixedAddress[i].toLowerCase() !== unprefixedAddress[i])) {
-                return false;
-            }
-        }
-        return true;
-    },
-    isAddress(address: string): boolean {
-        if (!BASIC_ADDRESS_REGEX.test(address)) {
-            // Check if it has the basic requirements of an address
-            return false;
-        } else if (SAME_CASE_ADDRESS_REGEX.test(address)) {
-            // If it's all small caps or all all caps, return true
-            return true;
-        } else {
-            // Otherwise check each case
-            const isValidChecksummedAddress = addressUtils.isChecksumAddress(address);
-            return isValidChecksummedAddress;
-        }
-    },
-};
diff --git a/packages/assert/src/globals.d.ts b/packages/assert/src/globals.d.ts
index cc47f3113..91ed2021e 100644
--- a/packages/assert/src/globals.d.ts
+++ b/packages/assert/src/globals.d.ts
@@ -1,5 +1 @@
 declare module 'dirty-chai';
-
-declare module 'ethereum-address' {
-    const isAddress: (arg: any) => boolean;
-}
diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
index 94900074a..fadc31d09 100644
--- a/packages/assert/src/index.ts
+++ b/packages/assert/src/index.ts
@@ -2,12 +2,11 @@ import {
     Schema,
     SchemaValidator,
 } from '@0xproject/json-schemas';
+import {addressUtils} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as validUrl from 'valid-url';
 
-import {addressUtils} from './address_utils';
-
 const HEX_REGEX = /^0x[0-9A-F]*$/i;
 
 export const assert = {