1 files changed, 25 insertions, 7 deletions
diff --git a/packages/instant/src/util/gas_price_estimator.ts b/packages/instant/src/util/gas_price_estimator.ts
index 336c4a3fa..6b15809a3 100644
--- a/packages/instant/src/util/gas_price_estimator.ts
+++ b/packages/instant/src/util/gas_price_estimator.ts
@@ -1,6 +1,11 @@
 import { BigNumber, fetchAsync } from '@0x/utils';
 
-import { DEFAULT_GAS_PRICE, ETH_GAS_STATION_API_BASE_URL, GWEI_IN_WEI } from '../constants';
+import {
+    DEFAULT_ESTIMATED_TRANSACTION_TIME_MS,
+    DEFAULT_GAS_PRICE,
+    ETH_GAS_STATION_API_BASE_URL,
+    GWEI_IN_WEI,
+} from '../constants';
 
 interface EthGasStationResult {
     average: number;
@@ -16,18 +21,25 @@ interface EthGasStationResult {
     safeLow: number;
 }
 
-const fetchFastAmountInWeiAsync = async () => {
+interface GasInfo {
+    gasPriceInWei: BigNumber;
+    estimatedTimeMs: number;
+}
+
+const fetchFastAmountInWeiAsync = async (): Promise<GasInfo> => {
     const res = await fetchAsync(`${ETH_GAS_STATION_API_BASE_URL}/json/ethgasAPI.json`);
     const gasInfo = (await res.json()) as EthGasStationResult;
     // Eth Gas Station result is gwei * 10
     const gasPriceInGwei = new BigNumber(gasInfo.fast / 10);
-    return gasPriceInGwei.mul(GWEI_IN_WEI);
+    // Time is in minutes
+    const estimatedTimeMs = gasInfo.fastWait * 60 * 1000; // Minutes to MS
+    return { gasPriceInWei: gasPriceInGwei.mul(GWEI_IN_WEI), estimatedTimeMs };
 };
 
 export class GasPriceEstimator {
-    private _lastFetched?: BigNumber;
-    public async getFastAmountInWeiAsync(): Promise<BigNumber> {
-        let fetchedAmount: BigNumber | undefined;
+    private _lastFetched?: GasInfo;
+    public async getGasInfoAsync(): Promise<GasInfo> {
+        let fetchedAmount: GasInfo | undefined;
         try {
             fetchedAmount = await fetchFastAmountInWeiAsync();
         } catch {
@@ -38,7 +50,13 @@ export class GasPriceEstimator {
             this._lastFetched = fetchedAmount;
         }
 
-        return fetchedAmount || this._lastFetched || DEFAULT_GAS_PRICE;
+        return (
+            fetchedAmount ||
+            this._lastFetched || {
+                gasPriceInWei: DEFAULT_GAS_PRICE,
+                estimatedTimeMs: DEFAULT_ESTIMATED_TRANSACTION_TIME_MS,
+            }
+        );
     }
 }
 export const gasPriceEstimator = new GasPriceEstimator();