1 files changed, 40 insertions, 0 deletions
diff --git a/packages/asset-buyer/src/constants.ts b/packages/asset-buyer/src/constants.ts
new file mode 100644
index 000000000..c0e1bf27d
--- /dev/null
+++ b/packages/asset-buyer/src/constants.ts
@@ -0,0 +1,40 @@
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+
+import { AssetBuyerOpts, BuyQuoteExecutionOpts, BuyQuoteRequestOpts, OrdersAndFillableAmounts } from './types';
+
+const NULL_ADDRESS = '0x0000000000000000000000000000000000000000';
+const MAINNET_NETWORK_ID = 1;
+
+const DEFAULT_ASSET_BUYER_OPTS: AssetBuyerOpts = {
+    networkId: MAINNET_NETWORK_ID,
+    orderRefreshIntervalMs: 10000, // 10 seconds
+    expiryBufferSeconds: 120, // 2 minutes
+};
+
+const DEFAULT_BUY_QUOTE_REQUEST_OPTS: BuyQuoteRequestOpts = {
+    feePercentage: 0,
+    shouldForceOrderRefresh: false,
+    slippagePercentage: 0.2, // 20% slippage protection
+};
+
+// Other default values are dynamically determined
+const DEFAULT_BUY_QUOTE_EXECUTION_OPTS: BuyQuoteExecutionOpts = {
+    feeRecipient: NULL_ADDRESS,
+};
+
+const EMPTY_ORDERS_AND_FILLABLE_AMOUNTS: OrdersAndFillableAmounts = {
+    orders: [] as SignedOrder[],
+    remainingFillableMakerAssetAmounts: [] as BigNumber[],
+};
+
+export const constants = {
+    ZERO_AMOUNT: new BigNumber(0),
+    NULL_ADDRESS,
+    MAINNET_NETWORK_ID,
+    ETHER_TOKEN_DECIMALS: 18,
+    DEFAULT_ASSET_BUYER_OPTS,
+    DEFAULT_BUY_QUOTE_EXECUTION_OPTS,
+    DEFAULT_BUY_QUOTE_REQUEST_OPTS,
+    EMPTY_ORDERS_AND_FILLABLE_AMOUNTS,
+};