ToolVet
72trust / 100

Counterparty Check

by Counterparty Check in Company & people data

x402 APIPassing, checked 8 h ago

One call, four public sources: how old the domain is (RDAP), whether mail to the contact will land (DNS), whether the name is on the OFAC list, and whether the company exists in the global LEI register. Returns a single GO / HOLD / STOP with every signal that produced it. Built for the moment an agent has to trust an invoice, a new vendor or a payment-detail change — the classic fraud pattern is a real-looking name on a domain registered weeks ago.

GET
https://402.com.tr/api/x402/counterparty-check
Price
$0.12
per call in USDC
Uptime
100%
last 30 days
Response time
474 ms
600 ms slowest 5%
Last check
Passed
8 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

GET https://402.com.tr/api/x402/counterparty-check

Each call costs $0.12 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://402.com.tr/api/x402/counterparty-check?domain=acme-supplies.com&email=billing%40acme-supplies.com&name=Acme+Supplies+Ltd

Parameters

ParameterTypeRequiredDescription
domainstringNoCompany domain
emailstringNoContact email (its domain is used if 'domain' is omitted)
namestringNoLegal company name (enables OFAC + LEI)

Example response

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

{
  "checkedAt": "2026-10-10T05:00:44.170Z",
  "decision": "STOP",
  "reasonsCount": 4
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.12.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://402.com.tr/api/x402/counterparty-check?domain=acme-supplies.com&email=billing%40acme-supplies.com&name=Acme+Supplies+Ltd'

# 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://402.com.tr/api/x402/counterparty-check?domain=acme-supplies.com&email=billing%40acme-supplies.com&name=Acme+Supplies+Ltd' \
  | 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 $0.12 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.12" });
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 $0.12 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Fcounterparty-check
const res = await pay("https://402.com.tr/api/x402/counterparty-check?domain=acme-supplies.com&email=billing%40acme-supplies.com&name=Acme+Supplies+Ltd");
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 $0.12 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.12"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://402.com.tr/api/x402/counterparty-check?domain=acme-supplies.com&email=billing%40acme-supplies.com&name=Acme+Supplies+Ltd")
    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
8 h agoPassed402371 ms$0.12
18 h agoPassed402551 ms$0.12
28 h agoPassed402651 ms$0.12
38 h agoPassed402523 ms$0.12
42 h agoPassed402586 ms$0.12
Show 10 older checks
46 h agoPassed402600 ms$0.12
2 days agoPassed402556 ms$0.12
2 days agoPassed402599 ms$0.12
2 days agoPassed402497 ms$0.12
3 days agoPassed402522 ms$0.12
3 days agoPassed402474 ms$0.12
3 days agoPassed402538 ms$0.12
3 days agoPassed402440 ms$0.12
3 days agoPassed402467 ms$0.12
3 days agoPassed402433 ms$0.12