2 files changed, 30 insertions, 11 deletions

diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index a70269dde..bcd435250 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -4,6 +4,9 @@ import * as React from 'react';
 
 import { WEB_3_WRAPPER_TRANSACTION_FAILED_ERROR_MSG_PREFIX } from '../constants';
 import { ColorOption } from '../style/theme';
+import { ZeroExInstantError } from '../types';
+import { getBestAddress } from '../util/address';
+import { balanceUtil } from '../util/balance';
 import { util } from '../util/util';
 import { web3Wrapper } from '../util/web3_wrapper';
 
@@ -12,7 +15,8 @@ import { Button, Text } from './ui';
 export interface BuyButtonProps {
     buyQuote?: BuyQuote;
     assetBuyer?: AssetBuyer;
-    onAwaitingSignature: (buyQuote: BuyQuote) => void;
+    onValidationPending: (buyQuote: BuyQuote) => void;
+    onValidationFail: (buyQuote: BuyQuote, errorMessage: AssetBuyerError | ZeroExInstantError) => void;
     onSignatureDenied: (buyQuote: BuyQuote, preventedError: Error) => void;
     onBuyProcessing: (buyQuote: BuyQuote, txHash: string) => void;
     onBuySuccess: (buyQuote: BuyQuote, txHash: string) => void;
@@ -42,14 +46,27 @@ export class BuyButton extends React.Component<BuyButtonProps> {
             return;
         }
 
+        this.props.onValidationPending(buyQuote);
+        const takerAddress = await getBestAddress();
+
+        const hasSufficentEth = await balanceUtil.hasSufficentEth(takerAddress, buyQuote, web3Wrapper);
+        if (!hasSufficentEth) {
+            this.props.onValidationFail(buyQuote, ZeroExInstantError.InsufficientETH);
+            return;
+        }
+
         let txHash: string | undefined;
-        this.props.onAwaitingSignature(buyQuote);
         try {
-            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote);
+            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote, { takerAddress });
         } catch (e) {
-            if (e instanceof Error && e.message === AssetBuyerError.SignatureRequestDenied) {
-                this.props.onSignatureDenied(buyQuote, e);
-                return;
+            if (e instanceof Error) {
+                if (e.message === AssetBuyerError.SignatureRequestDenied) {
+                    this.props.onSignatureDenied(buyQuote, e);
+                    return;
+                } else if (e.message === AssetBuyerError.TransactionValueTooLow) {
+                    this.props.onValidationFail(buyQuote, AssetBuyerError.TransactionValueTooLow);
+                    return;
+                }
             }
             throw e;
         }
diff --git a/packages/instant/src/components/buy_order_state_buttons.tsx b/packages/instant/src/components/buy_order_state_buttons.tsx
index b9e92e763..7c06ff31b 100644
--- a/packages/instant/src/components/buy_order_state_buttons.tsx
+++ b/packages/instant/src/components/buy_order_state_buttons.tsx
@@ -1,4 +1,4 @@
-import { AssetBuyer, BuyQuote } from '@0x/asset-buyer';
+import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
 import * as React from 'react';
 
 import { BuyButton } from '../components/buy_button';
@@ -7,7 +7,7 @@ import { Flex } from '../components/ui/flex';
 
 import { PlacingOrderButton } from '../components/placing_order_button';
 import { ColorOption } from '../style/theme';
-import { OrderProcessState } from '../types';
+import { OrderProcessState, ZeroExInstantError } from '../types';
 
 import { Button } from './ui/button';
 import { Text } from './ui/text';
@@ -17,7 +17,8 @@ export interface BuyOrderStateButtonProps {
     buyOrderProcessingState: OrderProcessState;
     assetBuyer?: AssetBuyer;
     onViewTransaction: () => void;
-    onAwaitingSignature: (buyQuote: BuyQuote) => void;
+    onValidationPending: (buyQuote: BuyQuote) => void;
+    onValidationFail: (buyQuote: BuyQuote, errorMessage: AssetBuyerError | ZeroExInstantError) => void;
     onSignatureDenied: (buyQuote: BuyQuote, error: Error) => void;
     onBuyProcessing: (buyQuote: BuyQuote, txHash: string) => void;
     onBuySuccess: (buyQuote: BuyQuote, txHash: string) => void;
@@ -45,7 +46,7 @@ export const BuyOrderStateButtons: React.StatelessComponent<BuyOrderStateButtonP
         props.buyOrderProcessingState === OrderProcessState.PROCESSING
     ) {
         return <SecondaryButton onClick={props.onViewTransaction}>View Transaction</SecondaryButton>;
-    } else if (props.buyOrderProcessingState === OrderProcessState.AWAITING_SIGNATURE) {
+    } else if (props.buyOrderProcessingState === OrderProcessState.VALIDATING) {
         return <PlacingOrderButton />;
     }
 
@@ -53,7 +54,8 @@ export const BuyOrderStateButtons: React.StatelessComponent<BuyOrderStateButtonP
         <BuyButton
             buyQuote={props.buyQuote}
             assetBuyer={props.assetBuyer}
-            onAwaitingSignature={props.onAwaitingSignature}
+            onValidationPending={props.onValidationPending}
+            onValidationFail={props.onValidationFail}
             onSignatureDenied={props.onSignatureDenied}
             onBuyProcessing={props.onBuyProcessing}
             onBuySuccess={props.onBuySuccess}