ToolVet
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Wallet Balances

by Blackwood State Wallet Balances in Onchain & crypto

x402 APIPassing, checked 5 h ago

Use when you need the ERC20 token balance or wallet balance of an address on Base for onchain data checks. Do not use for ethereum mainnet or other chains, NFTs, transaction history or USD values. Returns JSON with the ETH and ERC20 token balances of a wallet on Base, read on-chain in one block: 21 major tokens plus any you list for 0.004 USDC per call. Typical response time 1200 ms (p95). Category: Data.

POST
https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances
Price
$0.004
per call in USDC
Uptime
100%
last 30 days
Response time
1.2 s
2.0 s slowest 5%
Last check
Passed
5 h ago, next any minute now

Run a free test callHow to call it

Reliability

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

How to call it

POST https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances

Each call costs $0.004 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://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances
content-type: application/json

{
  "address": "0x5A6c77758820182484EA8DE614FC65423E80749a"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesWallet address on Base, e.g. 0x5A6c77758820182484EA8DE614FC65423E80749a
includeZerobooleanNoAlso list tokens with zero balance (false when omitted)
tokensarray of stringNoExtra ERC20 token addresses on Base to check, e.g. ["0x4200000000000000000000000000000000000006"] (up to 20, beyond the 21 major ones)

Example response

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

{
  "address": "0x5A6c77758820182484EA8DE614FC65423E80749a",
  "blockNumber": 52713897,
  "checkedTokens": 21,
  "native": {
    "balance": "0",
    "raw": "0",
    "symbol": "ETH"
  },
  "network": "eip155:8453",
  "notTokens": [],
  "tokens": [
    {
      "balance": "0.01",
      "decimals": 6,
      "raw": "10000",
      "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 $0.004.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x5A6c77758820182484EA8DE614FC65423E80749a"}'

# 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://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x5A6c77758820182484EA8DE614FC65423E80749a"}' \
  | 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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-gateway.blackwoodstate8.workers.dev%2Fv1%2Fwallet-balances&method=POST
const res = await pay("https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x5A6c77758820182484EA8DE614FC65423E80749a"
  }),
});
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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances",
        json={
            "address": "0x5A6c77758820182484EA8DE614FC65423E80749a",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
5 h agoPassed4021.2 s$0.004
10 h agoPassed4021.1 s$0.004
16 h agoPassed4022.0 s$0.004