ToolVet
77trust / 100

Payee Check

by Factline in Onchain & crypto

x402 APIPassing, checked 2 h ago

x402 seller verification before paying: payTo wallet OFAC screen, domain, uptime. Use before an agent pays an x402 endpoint it has not used before: reads the seller's own 402 challenge, screens every payTo wallet against the OFAC list, checks the domain (age, setup), Factline's daily uptime probes and, with company, the register record and EU/UN/UK/US sanctions. Returns allow, review or deny, plus a trust-provider block (decision, score, evidence, ttl). Input: url, optional wallet, company,...

GET https://factline.dev/v1/payee/check

Last 30 days

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

Uptime
100%
Response time
420 ms typical, 598 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

GET https://factline.dev/v1/payee/check

Each call costs $0.01 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://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck

Parameters

ParameterTypeRequiredDescription
companystringNoOptional company behind the seller: adds the register record and a sanctions screen of the company
countrystringNoOptional ISO country of that company, e.g. GB
urlstringNoThe x402 endpoint (or origin) you are about to pay, e.g. https://factline.dev/v1/kyb/check
walletstringNoOptional payTo wallet address to screen (read from the endpoint's 402 when url is given)

Example response

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

Example response, 45 lines
{
  "company": "not requested (send company and country)",
  "decision": "allow",
  "flags": [],
  "score": 100,
  "seller": {
    "domain": {
      "flags": [],
      "registered": "2026-09-16"
    },
    "health": {
      "checked_days": 30,
      "median_ms": 420,
      "ok_rate": 1
    },
    "origin": "https://factline.dev",
    "x402": {
      "networks": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "payment_options": [
        {
          "amount": "50000",
          "network": "eip155:8453",
          "pay_to": "0xb58dd178abac67f6d4894437a7fc725cbddb2075",
          "scheme": "exact"
        }
      ]
    }
  },
  "trust": {
    "decision": "allow",
    "evidence": "https://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck",
    "score": 100,
    "ttl": 3600
  },
  "wallets": [
    {
      "matches": [],
      "sanctioned": false,
      "wallet": "0xb58dd178abac67f6d4894437a7fc725cbddb2075"
    }
  ]
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck'

# 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://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fpayee%2Fcheck
const res = await pay("https://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://factline.dev/v1/payee/check?url=https%3A%2F%2Ffactline.dev%2Fv1%2Fkyb%2Fcheck")
    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 agoPassed402186 ms$0.01
5 h agoPassed402216 ms$0.01
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