Token balances (named contracts)

ERC-20 balances of one wallet for a NAMED list of token contracts (1-20) - the targeted complement to the full-portfolio wallet-balance tool. One balance read for the whole list plus symbol/decimals per contract (cached an hour server-side), so 'how much USDC and WETH does this wallet hold on Base?' is a single cheap call with exact decimal strings, not a portfolio dump.

TRY IN PLAYGROUND →

Input

Example output

{
  "network": "ethereum",
  "chainId": 1,
  "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "tokens": [
    {
      "contract": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
      "symbol": "USDC",
      "name": "USDC",
      "decimals": 6,
      "balance": "37.192124",
      "raw": "37192124"
    },
    {
      "contract": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      "symbol": "WETH",
      "name": "Wrapped Ether",
      "decimals": 18,
      "balance": "1.461",
      "raw": "1461000000000000000"
    }
  ],
  "source": "alchemy",
  "fetchedAt": "2026-08-22T12:00:00.000Z"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/token-balances \
  -H "Content-Type: application/json" \
  -d '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","contracts":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"],"network":"ethereum"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/token-balances", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "contracts": [
      "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
    ],
    "network": "ethereum"
  }),
});

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