ToolVet
79trust / 100

Chain Balance

by Wallet Balance in Onchain & crypto

x402 APIPassing, checked 3 h ago

Wallet balance on Base, Ethereum or Solana: give an address, get its ETH or SOL, USDC, USDT and any tokens you list, read live from the chain.

POST
https://chain.tollkit.dev/chain/balance
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
327 ms
464 ms slowest 5%
Last check
Passed
3 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://chain.tollkit.dev/chain/balance

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://chain.tollkit.dev/chain/balance
content-type: application/json

{
  "address": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
  "chain": "base"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesWallet (or contract) address to check.
chainstringNoWhich chain to read: "base" (default), "ethereum" or "solana". One of: base, ethereum, solana. Default: "base".
tokensarray of stringNoExtra ERC-20 contracts (or SPL mints on Solana) to include.

Example response

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

{
  "address": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
  "block_number": 52155294,
  "chain": "base",
  "checked_at": "2026-10-04T07:45:36.553Z",
  "explorer_url": "https://basescan.org/address/0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
  "is_contract": false,
  "native": {
    "balance": "0",
    "balance_wei": "0",
    "symbol": "ETH"
  },
  "tokens": [
    {
      "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "balance": "2.222",
      "balance_raw": "2222000",
      "decimals": 6,
      "name": "USD Coin",
      "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 $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain.tollkit.dev/chain/balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704","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 - -X POST 'https://chain.tollkit.dev/chain/balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704","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 $0.002 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%2Fchain.tollkit.dev%2Fchain%2Fbalance&method=POST
const res = await pay("https://chain.tollkit.dev/chain/balance", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
    "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 $0.002 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://chain.tollkit.dev/chain/balance",
        json={
            "address": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
            "chain": "base",
        },
    )
    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
3 h agoPassed402345 ms$0.002
7 h agoPassed402366 ms$0.002
12 h agoPassed402464 ms$0.002
16 h agoPassed402266 ms$0.002
20 h agoPassed402325 ms$0.002
Show 10 older checks
24 h agoPassed402397 ms$0.002
28 h agoPassed402343 ms$0.002
33 h agoPassed402309 ms$0.002
37 h agoPassed402342 ms$0.002
41 h agoPassed402331 ms$0.002
45 h agoPassed402284 ms$0.002
2 days agoPassed402276 ms$0.002
2 days agoPassed402317 ms$0.002
2 days agoPassed402404 ms$0.002
3 days agoPassed402211 ms$0.002