ToolVet
75trust / 100

Btc Tx Inspect

by Preflight in Onchain & crypto

x402 APIPassing, checked 2 h ago

Call before signing or broadcasting a Bitcoin transaction. Decodes a raw transaction hex or a PSBT and returns inputs, outputs, script types, addresses, vsize, fee rate when derivable, and objective signals such as RBF, dust outputs, non-standard sighash flags and unsigned inputs. Parses only the bytes you send: no network access. Describes the transaction; never advises whether to sign it.

POST
https://preflight402.com/v1/btc/tx-inspect
Price
$0.1
per call in USDC
Uptime
100%
last 30 days
Response time
664 ms
1.0 s 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

POST https://preflight402.com/v1/btc/tx-inspect

Each call costs $0.1 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://preflight402.com/v1/btc/tx-inspect
content-type: application/json

{
  "raw": "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"
}

Parameters

ParameterTypeRequiredDescription
networkstringNo One of: mainnet, testnet. Default: "mainnet".
psbtstringNo
rawstringNo

Example response

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

Example response, 45 lines
{
  "fee_rate_sat_vb": 10,
  "fee_sats": 1410,
  "inputs": [
    {
      "address": "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4",
      "has_final_script": false,
      "partial_sigs": 0,
      "prev_txid": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
      "prev_vout": 1,
      "script_sig": "",
      "sequence": 4294967293,
      "witness": [],
      "witness_utxo_value_sats": 50000
    }
  ],
  "kind": "psbt",
  "locktime": 0,
  "outputs": [
    {
      "address": "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4",
      "script_pubkey": "0014751e76e8199196d454941c45d1b3a323f1433bd6",
      "script_type": "p2wpkh",
      "value_sats": 12000
    },
    {
      "script_pubkey": "5120cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd",
      "script_type": "p2tr",
      "value_sats": 330
    }
  ],
  "signals": [
    "rbf_enabled",
    "dust_output",
    "unsigned_inputs"
  ],
  "thresholds": {
    "dust_output_sat": 546,
    "high_fee_rate_sat_vb": 100
  },
  "txid": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
  "version": 2,
  "vsize": 141,
  "weight": 561
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.1.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://preflight402.com/v1/btc/tx-inspect' \
  -H 'content-type: application/json' \
  --data-raw '{"raw":"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"}'

# 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://preflight402.com/v1/btc/tx-inspect' \
  -H 'content-type: application/json' \
  --data-raw '{"raw":"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"}' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fpreflight402.com%2Fv1%2Fbtc%2Ftx-inspect&method=POST
const res = await pay("https://preflight402.com/v1/btc/tx-inspect", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "raw": "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"
  }),
});
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://preflight402.com/v1/btc/tx-inspect",
        json={
            "raw": "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",
        },
    )
    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
2 h agoPassed402738 ms$0.1
7 h agoPassed402664 ms$0.1
11 h agoPassed402871 ms$0.1
16 h agoPassed402883 ms$0.1
21 h agoPassed402573 ms$0.1
Show 10 older checks
25 h agoPassed402586 ms$0.1
30 h agoPassed402629 ms$0.1
33 h agoPassed402791 ms$0.1
38 h agoPassed402733 ms$0.1
42 h agoPassed402796 ms$0.1
46 h agoPassed402484 ms$0.1
2 days agoPassed4021.3 s$0.1
2 days agoPassed4021.0 s$0.1
2 days agoPassed402800 ms$0.1
3 days agoPassed402610 ms$0.1