2 files changed, 34 insertions, 9 deletions
diff --git a/packages/instant/src/util/asset.ts b/packages/instant/src/util/asset.ts
new file mode 100644
index 000000000..ec22276ae
--- /dev/null
+++ b/packages/instant/src/util/asset.ts
@@ -0,0 +1,34 @@
+import { assetDataUtils } from '@0xproject/order-utils';
+import { AssetProxyId, ObjectMap } from '@0xproject/types';
+import * as _ from 'lodash';
+
+import { assetDataNetworkMapping } from '../data/asset_data_network_mapping';
+import { Asset, AssetMetaData, Network, ZeroExInstantError } from '../types';
+
+export const assetUtils = {
+    createAssetFromAssetData: (assetData: string, assetMetaDataMap: ObjectMap<AssetMetaData>): Asset => {
+        return {
+            assetProxyId: assetDataUtils.decodeAssetProxyId(assetData),
+            assetData,
+            metaData: assetUtils.getMetaDataOrThrow(assetData, assetMetaDataMap),
+        };
+    },
+    getMetaDataOrThrow: (
+        assetData: string,
+        metaDataMap: ObjectMap<AssetMetaData>,
+        network: Network = Network.Mainnet,
+    ): AssetMetaData => {
+        let mainnetAssetData: string | undefined = assetData;
+        if (network !== Network.Mainnet) {
+            mainnetAssetData = assetDataNetworkMapping.getAssociatedAssetDataIfExists(assetData, network);
+        }
+        if (_.isUndefined(mainnetAssetData)) {
+            throw new Error(ZeroExInstantError.AssetMetaDataNotAvailable);
+        }
+        const metaData = metaDataMap[mainnetAssetData];
+        if (_.isUndefined(metaData)) {
+            throw new Error();
+        }
+        return metaData;
+    },
+};
diff --git a/packages/instant/src/util/asset_buyer.ts b/packages/instant/src/util/asset_buyer.ts
deleted file mode 100644
index 27d66d600..000000000
--- a/packages/instant/src/util/asset_buyer.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { AssetBuyer } from '@0xproject/asset-buyer';
-
-import { sraApiUrl } from '../constants';
-
-import { getProvider } from './provider';
-
-const provider = getProvider();
-
-export const assetBuyer = AssetBuyer.getAssetBuyerForStandardRelayerAPIUrl(provider, sraApiUrl);