ToolVet
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Wallet Balance

by x402 Wallet Balance Lookup in Onchain & crypto

x402 APIPassing, checked 2 h ago

Native and (optional) ERC-20 token balance for a wallet address across major EVM chains (base, ethereum, polygon, arbitrum, optimism)

GET
https://x402tap.com/api/wallet-balance
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
280 ms
435 ms slowest 5%
Last check
Passed
2 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

GET https://x402tap.com/api/wallet-balance

Each call costs $0.01 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://x402tap.com/api/wallet-balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=base

Parameters

ParameterTypeRequiredDescription
addressstringYesEVM wallet address (0x...)
chainstringNoChain to query: base, ethereum, polygon, arbitrum, optimism (default base)
tokenstringNoOptional ERC-20 token contract address to also check

Example response

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

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "chain": "Base",
  "native": {
    "balance": "1.24031",
    "symbol": "ETH"
  },
  "token": {
    "address": "0x8335...",
    "balance": "500.0",
    "decimals": 6,
    "symbol": "USDC"
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402tap.com/api/wallet-balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=base'

# 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://x402tap.com/api/wallet-balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=base' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402tap.com%2Fapi%2Fwallet-balance
const res = await pay("https://x402tap.com/api/wallet-balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=base");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://x402tap.com/api/wallet-balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=base")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

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