[Ethereum] Get list of tokens balances from wallet address via web3


I'm using to get the balance of a single token/contract address within my wallet address.

If I have an array of tokens eg


Is there a possibility to pass that array into a single call that retrieves the balance for each? Or would we need to iterate through the list one by one?

Best Answer

You cannot do this through regular JSONRPC calls, but it is possible to limit the number of calls needed by using a smart contract. You can use the library eth-scan to do this for you. Simply pass in the array of addresses, and it will fetch the balance for each token through the eth-scan smart contract.

By default, the library will do a single call for every 1,000 tokens, but this is configurable.

For example:

import { getTokensBalance } from '@mycrypto/eth-scan';
import Web3 from 'web3';

// Get a Web3 provider from somewhere
const web3 = new Web3;

const address = "0x....";
const tokens = [
  // ...

// `eth-scan` can use a Web3 provider, but Ethers.js, HTTP URLs and EIP-1193 providers
// (e.g., `window.ethereum`) are also supported
getTokensBalance(web3, address, tokens)

Disclaimer: I am the author of eth-scan.