2 files changed, 11 insertions, 3 deletions
diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index e65e62e47..93bd8e635 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -2,11 +2,12 @@ import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
 import * as _ from 'lodash';
 import * as React from 'react';
 
-import { DEFAULT_GAS_PRICE, WEB_3_WRAPPER_TRANSACTION_FAILED_ERROR_MSG_PREFIX } from '../constants';
+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 { gasPriceEstimator } from '../util/gas_price_estimator';
 import { util } from '../util/util';
 import { web3Wrapper } from '../util/web3_wrapper';
 
@@ -56,9 +57,9 @@ export class BuyButton extends React.Component<BuyButtonProps> {
         }
 
         let txHash: string | undefined;
+        const gasPrice = await gasPriceEstimator.getFastAmountInWeiAsync();
         try {
-            const gasPrice = DEFAULT_GAS_PRICE;
-            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote, { gasPrice, takerAddress });
+            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote, { takerAddress, gasPrice });
         } catch (e) {
             if (e instanceof Error) {
                 if (e.message === AssetBuyerError.SignatureRequestDenied) {
diff --git a/packages/instant/src/components/zero_ex_instant.tsx b/packages/instant/src/components/zero_ex_instant.tsx
index 19a2d6b9b..d54dfc153 100644
--- a/packages/instant/src/components/zero_ex_instant.tsx
+++ b/packages/instant/src/components/zero_ex_instant.tsx
@@ -13,6 +13,7 @@ import { AssetMetaData, Network } from '../types';
 import { assetUtils } from '../util/asset';
 import { BigNumberInput } from '../util/big_number_input';
 import { errorFlasher } from '../util/error_flasher';
+import { gasPriceEstimator } from '../util/gas_price_estimator';
 import { getProvider } from '../util/provider';
 import { web3Wrapper } from '../util/web3_wrapper';
 
@@ -78,6 +79,12 @@ export class ZeroExInstant extends React.Component<ZeroExInstantProps> {
     public componentDidMount(): void {
         // tslint:disable-next-line:no-floating-promises
         asyncData.fetchAndDispatchToStore(this._store);
+
+        // warm up the gas price estimator cache just in case we can't
+        // grab the gas price estimate when submitting the transaction
+        // tslint:disable-next-line:no-floating-promises
+        gasPriceEstimator.getFastAmountInWeiAsync();
+
         // tslint:disable-next-line:no-floating-promises
         this._flashErrorIfWrongNetwork();
     }