ToolVet
76trust / 100

Chain Balance

by Tanod chainpeek in Onchain & crypto

x402 APIPassing, checked 34 min ago

chainpeek (Tanod) balance read: the native (ETH) balance of an address on Ethereum or Base, or its ERC-20 balance when a token contract is given. Read-only. On-chain strings are attacker-controlled.

POST https://tanod.dev/v1/chain/balance

Last 30 days

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Status and outage history · Atom feed

Uptime
95.0%
Response time
343 ms typical, 864 ms slowest 5%
Last check
34 min ago
Next check
any minute now

How to call it

POST https://tanod.dev/v1/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://tanod.dev/v1/chain/balance
content-type: application/json

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "chain": "base",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesAccount address (0x + 40 hex).
chainstringYesChain to read. One of: ethereum, base.
tokenstring or nullNoOptional ERC-20 contract address (0x + 40 hex); omit for the native balance. Default: null.

Example response

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

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "asset": "erc20",
  "chain": "base",
  "decimals": 6,
  "formatted": "1234.56",
  "raw": "1234560000",
  "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 $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tanod.dev/v1/chain/balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","chain":"base","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 - -X POST 'https://tanod.dev/v1/chain/balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","chain":"base","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 $0.002 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%2Ftanod.dev%2Fv1%2Fchain%2Fbalance&method=POST
const res = await pay("https://tanod.dev/v1/chain/balance", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "chain": "base",
    "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 $0.002 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://tanod.dev/v1/chain/balance",
        json={
            "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
            "chain": "base",
            "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
34 min agoPassed402886 ms$0.002
5 h agoPassed402864 ms$0.002
9 h agoPassed402349 ms$0.002
13 h agoPassed402343 ms$0.002
16 h agoPassed402481 ms$0.002
20 h agoPassed402250 ms$0.002
24 h agoExpected HTTP 402, got 5025024.5 s-
28 h agoPassed402261 ms$0.002
31 h agoPassed402394 ms$0.002
35 h agoPassed402262 ms$0.002
38 h agoPassed402270 ms$0.002
42 h agoPassed402304 ms$0.002
46 h agoPassed402714 ms$0.002
2 days agoPassed402344 ms$0.002
2 days agoPassed402277 ms$0.002