alchemy_getTokenBalances

// alchemy-token-api/alchemy-web3-script.js
import { createAlchemyWeb3 } from "@alch/alchemy-web3";

// Replace with your Alchemy api key:
const apiKey = "demo";

// Initialize an alchemy-web3 instance:
const web3 = createAlchemyWeb3(
  `https://eth-mainnet.g.alchemy.com/v2/${apiKey}`,
);

// The wallet address / token we want to query for:
const ownerAddr = "0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be";
const balances = await web3.alchemy.getTokenBalances(ownerAddr,["0x607f4c5bb672230e8672085532f7e901544a7375"])

console.log("BALANCES->");
console.log(balances);

// alchemy-token-api/fetch-script.js
import fetch from 'node-fetch';

// Replace with your Alchemy API key:
const apiKey = "demo";
const fetchURL = `https://eth-mainnet.g.alchemy.com/v2/${apiKey}`;

// Replace with the wallet address you want to query:
const ownerAddr = "0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be";
// Replace with the token contract address you want to query:
const tokenAddr = "0x607f4c5bb672230e8672085532f7e901544a7375";

var raw = JSON.stringify({
  "jsonrpc": "2.0",
  "method": "alchemy_getTokenBalances",
  "headers": {
    "Content-Type": "application/json"
  },
  "params": [
    `${ownerAddr}`,
    [
      `${tokenAddr}`,
    ]
  ],
  "id": 42
});

var requestOptions = {
  method: 'POST',
  body: raw,
  redirect: 'follow'
};

// Make the request and print the formatted response:
fetch(fetchURL, requestOptions)
  .then(response => response.json())
  .then(response => JSON.stringify(response, null, 2))
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

// alchemy-token-api/axios-script.js
import axios from 'axios';

// Replace with your Alchemy API key:
const apiKey = "demo";
const baseURL = `https://eth-mainnet.g.alchemy.com/v2/${apiKey}`;
// Replace with the wallet address you want to query:
const ownerAddr = "0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be";
// Replace with the token contract address you want to query:
const tokenAddr = "0x607f4c5bb672230e8672085532f7e901544a7375";

var data = JSON.stringify({
  "jsonrpc": "2.0",
  "method": "alchemy_getTokenBalances",
  "params": [
    `${ownerAddr}`,
    [
      `${tokenAddr}`
    ]
  ],
  "id": 42
});

var config = {
  method: 'post',
  url: baseURL,
  headers: {
    'Content-Type': 'application/json'
  },
  data : data
};

axios(config)
.then(function (response) {
  console.log(JSON.stringify(response.data, null, 2))
})
.catch(function (error) {
  console.log(error);
});

curl https://eth-mainnet.g.alchemy.com/v2/demo \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"alchemy_getTokenBalances","params": ["0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be", "erc20"],"id":"42"}'

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": {
    "address": "0x3f5ce5fbfe3e9af3971dd833d26ba9b5c936f0be",
    "tokenBalances": [
      {
        "contractAddress": "0x0000000000085d4780b73119b644ae5ecd22b376",
        "tokenBalance": "0x0000000000000000000000000000000000000000000000000000000000000000"
      },
      ......
      {
        "contractAddress": "0x0abefb7611cb3a01ea3fad85f33c3c934f8e2cf4",
        "tokenBalance": "0x00000000000000000000000000000000000000000000039e431953bcb76c0000"
      },
      {
        "contractAddress": "0x0ad0ad3db75ee726a284cfafa118b091493938ef",
        "tokenBalance": "0x0000000000000000000000000000000000000000008d00cf60e47f03a33fe6e3"
      }
    ],
    "pageKey": "0x0ad0ad3db75ee726a284cfafa118b091493938ef"
  }
}