4 files changed, 36 insertions, 0 deletions
diff --git a/packages/instant/src/util/asset_buyer.ts b/packages/instant/src/util/asset_buyer.ts
new file mode 100644
index 000000000..b030501c4
--- /dev/null
+++ b/packages/instant/src/util/asset_buyer.ts
@@ -0,0 +1,11 @@
+import { AssetBuyer } from '@0xproject/asset-buyer';
+
+import { sraApiUrl } from '../constants';
+
+import { getProvider } from './provider';
+
+const provider = getProvider();
+
+export const assetBuyer = AssetBuyer.getAssetBuyerForStandardRelayerAPIUrl(provider, sraApiUrl, {
+    expiryBufferSeconds: 300,
+});
diff --git a/packages/instant/src/util/coinbase_api.ts b/packages/instant/src/util/coinbase_api.ts
new file mode 100644
index 000000000..63c8077da
--- /dev/null
+++ b/packages/instant/src/util/coinbase_api.ts
@@ -0,0 +1,8 @@
+const baseEndpoint = 'https://api.coinbase.com/v2';
+export const coinbaseApi = {
+    getEthUsdPrice: async (): Promise<string> => {
+        const res = await fetch(`${baseEndpoint}/prices/ETH-USD/buy`);
+        const resJson = await res.json();
+        return resJson.data.amount;
+    },
+};
diff --git a/packages/instant/src/util/provider.ts b/packages/instant/src/util/provider.ts
new file mode 100644
index 000000000..49705fd11
--- /dev/null
+++ b/packages/instant/src/util/provider.ts
@@ -0,0 +1,12 @@
+import { Provider } from 'ethereum-types';
+
+export const getProvider = (): Provider => {
+    const injectedWeb3 = (window as any).web3 || undefined;
+    try {
+        // Use MetaMask/Mist provider
+        return injectedWeb3.currentProvider;
+    } catch (err) {
+        // Throws when user doesn't have MetaMask/Mist running
+        throw new Error(`No injected web3 found: ${err}`);
+    }
+};
diff --git a/packages/instant/src/util/web3_wrapper.ts b/packages/instant/src/util/web3_wrapper.ts
new file mode 100644
index 000000000..d7e43521f
--- /dev/null
+++ b/packages/instant/src/util/web3_wrapper.ts
@@ -0,0 +1,5 @@
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+
+import { getProvider } from './provider';
+
+export const web3Wrapper = new Web3Wrapper(getProvider());