Lowercase public addresses

Normalize the public api addresses to lowercase to prevent an avoidable
error

1 files changed, 3 insertions, 2 deletions

diff --git a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
index f54aaf0f8..508ff15d7 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -57,10 +57,11 @@ export class TokenRegistryWrapper extends ContractWrapper {
      * @return  An object that conforms to the Token interface or undefined if token not found.
      */
     public async getTokenIfExistsAsync(address: string): Promise<Token | undefined> {
-        assert.isETHAddressHex('address', address);
+        const normalizedAddress = address.toLowerCase();
+        assert.isETHAddressHex('address', normalizedAddress);
 
         const tokenRegistryContract = await this._getTokenRegistryContractAsync();
-        const metadata = await tokenRegistryContract.getTokenMetaData.callAsync(address);
+        const metadata = await tokenRegistryContract.getTokenMetaData.callAsync(normalizedAddress);
         const token = TokenRegistryWrapper._createTokenFromMetadata(metadata);
         return token;
     }