ToolVet
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Token Balances

by Token balances (named contracts) in Onchain & crypto

x402 APIPassing, checked 1 h ago

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.

POST
https://agent402.tools/api/token-balances
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
198 ms
445 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agent402.tools/api/token-balances

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agent402.tools/api/token-balances
content-type: application/json

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "contracts": [
    "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
  ],
  "network": "ethereum"
}

Parameters

ParameterTypeRequiredDescription
addressstringYes0x-prefixed 40-char EVM wallet address.
contractsarray of stringYes1-20 ERC-20 contract addresses to read.
networkstringNoethereum / base / polygon / arbitrum / optimism (default ethereum).

Example response

The provider's example. We can't check it without paying.

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

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/api/token-balances' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","contracts":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"],"network":"ethereum"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://agent402.tools/api/token-balances' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","contracts":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"],"network":"ethereum"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Ftoken-balances&method=POST
const res = await pay("https://agent402.tools/api/token-balances", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "contracts": [
      "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
    ],
    "network": "ethereum"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent402.tools/api/token-balances",
        json={
            "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
            "contracts": [
                "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
                "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
            ],
            "network": "ethereum",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402201 ms$0.002
6 h agoPassed402212 ms$0.002
11 h agoPassed402201 ms$0.002
16 h agoPassed402211 ms$0.002
20 h agoPassed402197 ms$0.002
Show 10 older checks
25 h agoPassed402203 ms$0.002
29 h agoPassed402200 ms$0.002
33 h agoPassed402194 ms$0.002
37 h agoPassed402193 ms$0.002
41 h agoPassed402196 ms$0.002
45 h agoPassed402188 ms$0.002
2 days agoPassed402186 ms$0.002
2 days agoPassed402193 ms$0.002
2 days agoPassed402192 ms$0.002
3 days agoPassed402206 ms$0.002

History

23 Oct 2026Price on eip155:4663 changed from 2000 units of 0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168 to 5000 units of 0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168