ToolVet
75trust / 100

Base Erc20 Balance

by heb-utils-x402.hebutils-api.workers.dev in Onchain & crypto

x402 APIPassing, checked 49 min ago

Get the ERC-20 token balance of any wallet on Base mainnet. Pass the token contract address and the holder address. Returns the raw balance, decimals, token symbol and the human-readable balance in one JSON response. Works for USDC, WETH, DAI or any standard ERC-20. Read-only, live on-chain data.

GET
https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
471 ms
866 ms slowest 5%
Last check
Passed
49 min 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

GET https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance

Each call costs $0.001 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.

GET https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance?holder=0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Parameters

ParameterTypeRequiredDescription
holderstringNo
tokenstringNo

Example response

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

{
  "balance": "1.5",
  "balance_raw": "1500000",
  "chain": "base",
  "checked_at": "2026-10-12T00:00:00.000Z",
  "decimals": 6,
  "holder": "0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52",
  "symbol": "USDC",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance?holder=0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'

# 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 - 'https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance?holder=0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fheb-utils-x402.hebutils-api.workers.dev%2Fbase-erc20-balance
const res = await pay("https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance?holder=0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913");
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://heb-utils-x402.hebutils-api.workers.dev/base-erc20-balance?holder=0x1CD76fe5f38Ae5B2785962EE5a3799e846E9fA52&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913")
    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
49 min agoPassed402389 ms$0.001
6 h agoPassed402647 ms$0.001
10 h agoPassed402866 ms$0.001
15 h agoPassed402657 ms$0.001
20 h agoPassed402471 ms$0.001
Show 10 older checks
24 h agoPassed402583 ms$0.001
29 h agoPassed402746 ms$0.001
33 h agoPassed402464 ms$0.001
37 h agoPassed402501 ms$0.001
41 h agoPassed402712 ms$0.001
46 h agoPassed402436 ms$0.001
2 days agoPassed402574 ms$0.001
2 days agoPassed402597 ms$0.001
2 days agoPassed402435 ms$0.001
3 days agoPassed402628 ms$0.001

History

12 Oct 2026Price changed from $0.003 to $0.001