ToolVet
80trust / 100

Btc Tx

by SiteCheck in Onchain & crypto

x402 APIPassing, checked 31 min ago

A Bitcoin transaction by txid: confirmed block and time (or unconfirmed), fee in sats and sat/vB, size and virtual size, input and output totals, and whether it signals replace-by-fee. Source: mempool.space. Information only, not financial advice.

GET
https://api.sitecheck-api.workers.dev/api/btc/tx
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
62 ms
1.0 s slowest 5%
Last check
Passed
31 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

How to call it

GET https://api.sitecheck-api.workers.dev/api/btc/tx

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.

GET https://api.sitecheck-api.workers.dev/api/btc/tx?txid=f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16

Parameters

ParameterTypeRequiredDescription
txidstringYesTransaction id, 64 hex characters

Example response

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

Example response, 30 lines
{
  "checkedAt": "2026-10-14T07:00:19.934Z",
  "fee": {
    "btc": 0,
    "satPerVbyte": 0,
    "sats": 0
  },
  "inputs": {
    "coinbase": false,
    "count": 1,
    "totalBtc": 50
  },
  "outputs": {
    "count": 2,
    "totalBtc": 50
  },
  "rbf": false,
  "size": {
    "bytes": 275,
    "vbytes": 275,
    "weight": 1100
  },
  "source": "https://mempool.space/api/tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16",
  "status": {
    "blockHeight": 170,
    "blockTime": "2009-01-12T03:30:25.000Z",
    "confirmed": true
  },
  "txid": "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16"
}

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 'https://api.sitecheck-api.workers.dev/api/btc/tx?txid=f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16'

# 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://api.sitecheck-api.workers.dev/api/btc/tx?txid=f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16' \
  | 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%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fbtc%2Ftx
const res = await pay("https://api.sitecheck-api.workers.dev/api/btc/tx?txid=f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16");
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.get("https://api.sitecheck-api.workers.dev/api/btc/tx?txid=f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16")
    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
31 min agoPassed402123 ms$0.002
5 h agoPassed4021.0 s$0.002
9 h agoPassed40275 ms$0.002
13 h agoPassed40259 ms$0.002
18 h agoPassed40262 ms$0.002
Show 1 older checks
22 h agoPassed40251 ms$0.002