Check isETHAddressHex before lowercase

Flip the check so assertion happens before lowercase

9 files changed, 60 insertions, 67 deletions

diff --git a/packages/0x.js/CHANGELOG.md b/packages/0x.js/CHANGELOG.md
index 0af474c74..26916f5fa 100644
--- a/packages/0x.js/CHANGELOG.md
+++ b/packages/0x.js/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## v0.33.x - TBD
+
+    * Validate and lowercase all addresses in public methods (#373)
+
 ## v0.32.2 - _February 9, 2018_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index c37b3e1ef..fa00bcd1a 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -71,10 +71,10 @@ export class ZeroEx {
      * @return  Whether the signature is valid for the supplied signerAddress and data.
      */
     public static isValidSignature(data: string, signature: ECSignature, signerAddress: string): boolean {
-        const normalizedSignerAddress = signerAddress.toLowerCase();
         assert.isHexString('data', data);
         assert.doesConformToSchema('signature', signature, schemas.ecSignatureSchema);
-        assert.isETHAddressHex('signerAddress', normalizedSignerAddress);
+        assert.isETHAddressHex('signerAddress', signerAddress);
+        const normalizedSignerAddress = signerAddress.toLowerCase();
 
         const isValidSignature = signatureUtils.isValidSignature(data, signature, normalizedSignerAddress);
         return isValidSignature;
@@ -245,9 +245,8 @@ export class ZeroEx {
         shouldAddPersonalMessagePrefix: boolean,
     ): Promise<ECSignature> {
         assert.isHexString('orderHash', orderHash);
+        await assert.isSenderAddressAsync('signerAddress', signerAddress, this._web3Wrapper);
         const normalizedSignerAddress = signerAddress.toLowerCase();
-        assert.isETHAddressHex('signerAddress', normalizedSignerAddress);
-        await assert.isSenderAddressAsync('signerAddress', normalizedSignerAddress, this._web3Wrapper);
 
         let msgHashHex = orderHash;
         if (shouldAddPersonalMessagePrefix) {
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index 236b2be4f..c3ff60a10 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -41,12 +41,11 @@ export class EtherTokenWrapper extends ContractWrapper {
         depositor: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        const normalizedDepositorAddress = depositor.toLowerCase();
-        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
-        assert.isETHAddressHex('depositor', normalizedDepositorAddress);
-        assert.isETHAddressHex('etherTokenAddress', normalizedEtherTokenAddress);
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
         assert.isValidBaseUnitAmount('amountInWei', amountInWei);
-        await assert.isSenderAddressAsync('depositor', normalizedDepositorAddress, this._web3Wrapper);
+        await assert.isSenderAddressAsync('depositor', depositor, this._web3Wrapper);
+        const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
+        const normalizedDepositorAddress = depositor.toLowerCase();
 
         const ethBalanceInWei = await this._web3Wrapper.getBalanceInWeiAsync(normalizedDepositorAddress);
         assert.assert(ethBalanceInWei.gte(amountInWei), ZeroExError.InsufficientEthBalanceForDeposit);
@@ -75,12 +74,11 @@ export class EtherTokenWrapper extends ContractWrapper {
         withdrawer: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isValidBaseUnitAmount('amountInWei', amountInWei);
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
+        await assert.isSenderAddressAsync('withdrawer', withdrawer, this._web3Wrapper);
         const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
         const normalizedWithdrawerAddress = withdrawer.toLowerCase();
-        assert.isETHAddressHex('withdrawer', normalizedWithdrawerAddress);
-        assert.isETHAddressHex('etherTokenAddress', normalizedEtherTokenAddress);
-        assert.isValidBaseUnitAmount('amountInWei', amountInWei);
-        await assert.isSenderAddressAsync('withdrawer', normalizedWithdrawerAddress, this._web3Wrapper);
 
         const WETHBalanceInBaseUnits = await this._tokenWrapper.getBalanceAsync(
             normalizedEtherTokenAddress,
@@ -111,8 +109,8 @@ export class EtherTokenWrapper extends ContractWrapper {
         blockRange: BlockRange,
         indexFilterValues: IndexedFilterValues,
     ): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
         const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
-        assert.isETHAddressHex('etherTokenAddress', normalizedEtherTokenAddress);
         assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
         assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
@@ -140,8 +138,8 @@ export class EtherTokenWrapper extends ContractWrapper {
         indexFilterValues: IndexedFilterValues,
         callback: EventCallback<ArgsType>,
     ): string {
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
         const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
-        assert.isETHAddressHex('etherTokenAddress', normalizedEtherTokenAddress);
         assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         assert.isFunction('callback', callback);
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 7db13a1ba..e366c46cd 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -179,9 +179,8 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
 
         const exchangeInstance = await this._getExchangeContractAsync();
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
@@ -255,9 +254,8 @@ export class ExchangeWrapper extends ContractWrapper {
         );
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
 
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
@@ -348,9 +346,8 @@ export class ExchangeWrapper extends ContractWrapper {
             ExchangeContractErrs.BatchOrdersMustHaveSameExchangeAddress,
         );
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
             : orderTransactionOpts.shouldValidate;
@@ -422,9 +419,8 @@ export class ExchangeWrapper extends ContractWrapper {
     ): Promise<string> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
@@ -483,9 +479,8 @@ export class ExchangeWrapper extends ContractWrapper {
             exchangeContractAddresses,
             ExchangeContractErrs.BatchOrdersMustHaveSameExchangeAddress,
         );
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
         if (_.isEmpty(orderFillRequests)) {
             throw new Error(ExchangeContractErrs.BatchOrdersMustHaveAtLeastOneItem);
         }
@@ -555,7 +550,6 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isValidBaseUnitAmount('takerTokenCancelAmount', cancelTakerTokenAmount);
         await assert.isSenderAddressAsync('order.maker', order.maker, this._web3Wrapper);
         const normalizedMakerAddress = order.maker.toLowerCase();
-        assert.isETHAddressHex('order.maker', normalizedMakerAddress);
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
@@ -614,9 +608,8 @@ export class ExchangeWrapper extends ContractWrapper {
         const makers = _.map(orderCancellationRequests, cancellationRequest => cancellationRequest.order.maker);
         assert.hasAtMostOneUniqueValue(makers, ExchangeContractErrs.MultipleMakersInSingleCancelBatchDisallowed);
         const maker = makers[0];
+        await assert.isSenderAddressAsync('maker', maker, this._web3Wrapper);
         const normalizedMakerAddress = maker.toLowerCase();
-        assert.isETHAddressHex('maker', normalizedMakerAddress);
-        await assert.isSenderAddressAsync('maker', normalizedMakerAddress, this._web3Wrapper);
 
         const shouldValidate = _.isUndefined(orderTransactionOpts.shouldValidate)
             ? SHOULD_VALIDATE_BY_DEFAULT
@@ -771,9 +764,8 @@ export class ExchangeWrapper extends ContractWrapper {
     ): Promise<void> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
         const zrxTokenAddress = this.getZRXTokenAddress();
         const exchangeTradeEmulator = new ExchangeTransferSimulator(this._tokenWrapper, BlockParamLiteral.Latest);
         await this._orderValidationUtils.validateFillOrderThrowIfInvalidAsync(
@@ -819,9 +811,8 @@ export class ExchangeWrapper extends ContractWrapper {
     ): Promise<void> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isValidBaseUnitAmount('fillTakerTokenAmount', fillTakerTokenAmount);
+        await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         const normalizedTakerAddress = takerAddress.toLowerCase();
-        assert.isETHAddressHex('takerAddress', normalizedTakerAddress);
-        await assert.isSenderAddressAsync('takerAddress', normalizedTakerAddress, this._web3Wrapper);
         const zrxTokenAddress = this.getZRXTokenAddress();
         const exchangeTradeEmulator = new ExchangeTransferSimulator(this._tokenWrapper, BlockParamLiteral.Latest);
         await this._orderValidationUtils.validateFillOrKillOrderThrowIfInvalidAsync(
@@ -892,11 +883,12 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isHexString('dataHex', dataHex);
         assert.doesConformToSchema('ecSignature', ecSignature, schemas.ecSignatureSchema);
         assert.isETHAddressHex('signerAddressHex', signerAddressHex);
+        const normalizedSignerAddress = signerAddressHex.toLowerCase();
 
         const exchangeInstance = await this._getExchangeContractAsync();
 
         const isValidSignature = await exchangeInstance.isValidSignature.callAsync(
-            signerAddressHex,
+            normalizedSignerAddress,
             dataHex,
             ecSignature.v,
             ecSignature.r,
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 508ff15d7..f0ae5f33c 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -57,8 +57,8 @@ 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(normalizedAddress);
diff --git a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
index 41afd2f67..f0cbf364d 100644
--- a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
@@ -23,8 +23,8 @@ export class TokenTransferProxyWrapper extends ContractWrapper {
      * @return  Whether the exchangeContractAddress is authorized.
      */
     public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
+        assert.isETHAddressHex('exchangeContractAddress', exchangeContractAddress);
         const normalizedExchangeContractAddress = exchangeContractAddress.toLowerCase();
-        assert.isETHAddressHex('exchangeContractAddress', normalizedExchangeContractAddress);
         const tokenTransferProxyContractInstance = await this._getTokenTransferProxyContractAsync();
         const isAuthorized = await tokenTransferProxyContractInstance.authorized.callAsync(
             normalizedExchangeContractAddress,
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 61da8c6ef..154d3fae6 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -44,10 +44,10 @@ export class TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         methodOpts?: MethodOpts,
     ): Promise<BigNumber> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
 
         const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
@@ -74,12 +74,12 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('spenderAddress', spenderAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        await assert.isSenderAddressAsync('ownerAddress', ownerAddress, this._web3Wrapper);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
-        const normalizedOwnerAddress = ownerAddress.toLowerCase();
         const normalizedSpenderAddress = spenderAddress.toLowerCase();
-        await assert.isSenderAddressAsync('ownerAddress', normalizedOwnerAddress, this._web3Wrapper);
-        assert.isETHAddressHex('spenderAddress', normalizedSpenderAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
+        const normalizedOwnerAddress = ownerAddress.toLowerCase();
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
         const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
@@ -108,12 +108,12 @@ export class TokenWrapper extends ContractWrapper {
         spenderAddress: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isETHAddressHex('spenderAddress', spenderAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
         const normalizedSpenderAddress = spenderAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
-        assert.isETHAddressHex('spenderAddress', normalizedSpenderAddress);
         const txHash = await this.setAllowanceAsync(
             normalizedTokenAddress,
             normalizedOwnerAddress,
@@ -137,11 +137,12 @@ export class TokenWrapper extends ContractWrapper {
         spenderAddress: string,
         methodOpts?: MethodOpts,
     ): Promise<BigNumber> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isETHAddressHex('spenderAddress', spenderAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
         const normalizedSpenderAddress = spenderAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
 
         const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
         const defaultBlock = _.isUndefined(methodOpts) ? undefined : methodOpts.defaultBlock;
@@ -165,10 +166,10 @@ export class TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         methodOpts?: MethodOpts,
     ): Promise<BigNumber> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
 
         const proxyAddress = this._tokenTransferProxyWrapper.getContractAddress();
         const allowanceInBaseUnits = await this.getAllowanceAsync(
@@ -195,10 +196,10 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
         const proxyAddress = this._tokenTransferProxyWrapper.getContractAddress();
@@ -227,10 +228,10 @@ export class TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('ownerAddress', ownerAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedOwnerAddress = ownerAddress.toLowerCase();
-        assert.isETHAddressHex('ownerAddress', normalizedOwnerAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
         const txHash = await this.setProxyAllowanceAsync(
             normalizedTokenAddress,
             normalizedOwnerAddress,
@@ -255,13 +256,12 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isETHAddressHex('toAddress', toAddress);
+        await assert.isSenderAddressAsync('fromAddress', fromAddress, this._web3Wrapper);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedFromAddress = fromAddress.toLowerCase();
         const normalizedToAddress = toAddress.toLowerCase();
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
-        assert.isETHAddressHex('toAddress', toAddress);
-        assert.isETHAddressHex('fromAddress', normalizedFromAddress);
-        await assert.isSenderAddressAsync('fromAddress', normalizedFromAddress, this._web3Wrapper);
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
         const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
@@ -300,15 +300,14 @@ export class TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
+        assert.isETHAddressHex('toAddress', toAddress);
+        assert.isETHAddressHex('fromAddress', fromAddress);
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        await assert.isSenderAddressAsync('senderAddress', senderAddress, this._web3Wrapper);
         const normalizedToAddress = toAddress.toLowerCase();
         const normalizedFromAddress = fromAddress.toLowerCase();
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         const normalizedSenderAddress = senderAddress.toLowerCase();
-        assert.isETHAddressHex('toAddress', normalizedToAddress);
-        assert.isETHAddressHex('fromAddress', normalizedFromAddress);
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
-        assert.isETHAddressHex('senderAddress', normalizedSenderAddress);
-        await assert.isSenderAddressAsync('senderAddress', normalizedSenderAddress, this._web3Wrapper);
         assert.isValidBaseUnitAmount('amountInBaseUnits', amountInBaseUnits);
 
         const tokenContract = await this._getTokenContractAsync(normalizedTokenAddress);
@@ -354,8 +353,8 @@ export class TokenWrapper extends ContractWrapper {
         indexFilterValues: IndexedFilterValues,
         callback: EventCallback<ArgsType>,
     ): string {
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
         assert.doesBelongToStringEnum('eventName', eventName, TokenEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         assert.isFunction('callback', callback);
@@ -396,8 +395,8 @@ export class TokenWrapper extends ContractWrapper {
         blockRange: BlockRange,
         indexFilterValues: IndexedFilterValues,
     ): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
         const normalizedTokenAddress = tokenAddress.toLowerCase();
-        assert.isETHAddressHex('tokenAddress', normalizedTokenAddress);
         assert.doesBelongToStringEnum('eventName', eventName, TokenEvents);
         assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
diff --git a/packages/assert/CHANGELOG.md b/packages/assert/CHANGELOG.md
index 23c2c5e56..fff014811 100644
--- a/packages/assert/CHANGELOG.md
+++ b/packages/assert/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## v0.1.XX - TBD
+
+    * Remove isETHAddressHex checksum address check and assume address will be lowercased  (#373)
+
 ## v0.0.18 - _February 9, 2017_
 
     * Fix publishing issue where .npmignore was not properly excluding undesired content (#389)
diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
index 7ad574ec7..a9d553487 100644
--- a/packages/assert/src/index.ts
+++ b/packages/assert/src/index.ts
@@ -33,11 +33,8 @@ export const assert = {
         );
     },
     isETHAddressHex(variableName: string, value: string): void {
+        this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value));
         this.assert(addressUtils.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
-        this.assert(
-            addressUtils.isAddress(value) && value.toLowerCase() === value,
-            `Checksummed addresses are not supported. Convert ${variableName} to lower case before passing`,
-        );
     },
     doesBelongToStringEnum(
         variableName: string,