feat: add ability to fetch token list

src/alexSDK.ts

@@ -16,6 +16,7 @@ import {
   broadcastSponsoredTx,
   isSponsoredSwapEnabled,
 } from './utils/sponsoredTx';
+import { fetchTokenList, TokenInfo } from './utils/tokenlist';
 export { SponsoredTxError, SponsoredTxErrorCode } from './utils/sponsoredTx';
 
 export class AlexSDK {
@@ -109,4 +110,8 @@ export class AlexSDK {
   isSponsoredSwapEnabled(): Promise<boolean> {
     return isSponsoredSwapEnabled().catch(() => false);
   }
+
+  fetchTokenList(): Promise<TokenInfo[]> {
+    return fetchTokenList()
+  }
 }

src/utils/tokenlist.ts

@@ -0,0 +1,17 @@
+export type TokenInfo = {
+  type: 'fungibleToken',
+  id: string,
+  displayPrecision: number,
+  icon: string,
+  availableInSwap: boolean,
+  contractAddress: string,
+  decimals: number
+}
+
+export function fetchTokenList(): Promise<TokenInfo[]> {
+  return fetch('https://token-list.alexlab.co', {
+    mode: 'cors'
+  })
+    .then(res => res.json())
+    .then(data => data.tokens)
+}