feat: add getSwapTokens action

.changeset/bright-colts-drive.md

@@ -0,0 +1,5 @@
+---
+"@across-protocol/app-sdk": patch
+---
+
+add getSwapTokens action

packages/sdk/src/actions/getSwapTokens.ts

@@ -0,0 +1,60 @@
+import { Address } from "viem";
+import { LoggerT, fetchAcrossApi } from "../utils/index.js";
+import { MAINNET_API_URL } from "../constants/index.js";
+
+export type SwapApiToken = {
+  chainId: number;
+  address: Address;
+  name: string;
+  symbol: string;
+  decimals: number;
+  logoUrl: string;
+  priceUsd: string | null;
+};
+
+type SwapApiTokensResponse = SwapApiToken[];
+
+/**
+ * Params for {@link getSwapTokens}.
+ */
+export type GetSwapTokensParams = Partial<{
+  /**
+   * [Optional] Filter tokens by chain ID. If provided, only tokens from this chain will be returned.
+   */
+  chainId: number;
+  /**
+   * [Optional] The Across API URL to use. Defaults to the mainnet API URL.
+   */
+  apiUrl: string;
+  /**
+   * [Optional] The logger to use.
+   */
+  logger: LoggerT;
+}>;
+
+export type GetSwapTokensReturnType = SwapApiToken[];
+
+/**
+ * Get available tokens across all supported chains or filtered by chain ID.
+ * @param params - See {@link GetSwapTokensParams}.
+ * @returns See {@link GetSwapTokensReturnType}.
+ * @public
+ */
+export async function getSwapTokens({
+  chainId,
+  apiUrl = MAINNET_API_URL,
+  logger,
+}: GetSwapTokensParams = {}): Promise<GetSwapTokensReturnType> {
+  const tokens = await fetchAcrossApi<SwapApiTokensResponse>(
+    `${apiUrl}/swap/tokens`,
+    {},
+    logger,
+  );
+
+  // Apply client-side chainId filtering if specified
+  if (chainId) {
+    return tokens.filter((token) => token.chainId === chainId);
+  }
+
+  return tokens;
+}

packages/sdk/src/actions/index.ts

@@ -2,6 +2,7 @@ export * from "./getSuggestedFees.js";
 export * from "./getAvailableRoutes.js";
 export * from "./getLimits.js";
 export * from "./getQuote.js";
+export * from "./getSwapTokens.js";
 export * from "./simulateDepositTx.js";
 export * from "./waitForDepositTx.js";
 export * from "./getFillByDepositTx.js";

packages/sdk/src/client.ts

@@ -10,6 +10,7 @@ import {
   getSuggestedFees,
   getLimits,
   getQuote,
+  getSwapTokens,
   waitForDepositTx,
   getDeposit,
   getFillByDepositTx,
@@ -20,6 +21,8 @@ import {
   GetSuggestedFeesReturnType,
   GetLimitsParams,
   GetLimitsReturnType,
+  GetSwapTokensParams,
+  GetSwapTokensReturnType,
   simulateDepositTx,
   SimulateDepositTxParams,
   waitForFillTx,
@@ -375,6 +378,21 @@ export class AcrossClient {
     });
   }
 
+  /**
+   * Get available tokens from the swap API. See {@link getSwapTokens}.
+   * @param params - See {@link GetSwapTokensParams}.
+   * @returns See {@link GetSwapTokensReturnType}.
+   */
+  async getSwapTokens(
+    params: MakeOptional<GetSwapTokensParams, "apiUrl" | "logger"> = {},
+  ): Promise<GetSwapTokensReturnType> {
+    return getSwapTokens({
+      ...params,
+      apiUrl: params?.apiUrl || this.apiUrl,
+      logger: params?.logger ?? this.logger,
+    });
+  }
+
   /**
    * Get the suggested fees for a given route. See {@link getSuggestedFees}.
    * @param params - See {@link GetSuggestedFeesParams}.