Counterparty Check

{
  "checked_at": "2026-10-12T23:30:00.000Z",
  "checks": [
    {
      "check": "sanctions",
      "status": "ok"
    },
    {
      "check": "company",
      "status": "ok"
    },
    {
      "check": "domain",
      "status": "ok"
    },
    {
      "check": "wallet",
      "status": "skipped"
    }
  ],
  "company": {
    "cik": null,
    "description": "Irish-American financial services company",
    "employees": 8000,
    "founded": "2010",
    "headquarters": "South San Francisco, United States",
    "industry": "financial services",
    "is_public": false,
    "name": "Stripe",
    "tickers": [],
    "website": "https://stripe.com"
  },
  "disclaimer": "A screening aid, not legal advice. Confirm sanctions matches with OFAC (https://sanctionssearch.ofac.treas.gov) before acting.",
  "domain": {
    "dmarc_policy": "reject",
    "domain": "stripe.com",
    "email_provider": "Google Workspace",
    "has_mx_records": true,
    "https": true,
    "registered": "1995-09-12T04:00:00Z",
    "website_reachable": true
  },
  "next_calls": [
    {
      "arguments": {
        "url": "https://stripe.com"
      },
      "price": "$0.002",
      "tool": "scrape_markdown",
      "why": "Read stripe.com's website."
    }
  ],
  "query": {
    "chain": "base",
    "domain": "stripe.com",
    "name": "Stripe, Inc.",
    "wallet": null
  },
  "reasons": [],
  "sanctions": {
    "clear": true,
    "matches": []
  },
  "summary": "Stripe: no flags in the sanctions, company, domain checks.",
  "verdict": "clear",
  "wallet": null
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402-agent-api.onrender.com/api/v1/counterparty-check' \
  -H 'content-type: application/json' \
  --data-raw '{"domain":"stripe.com","name":"Stripe, Inc."}'

# 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://x402-agent-api.onrender.com/api/v1/counterparty-check' \
  -H 'content-type: application/json' \
  --data-raw '{"domain":"stripe.com","name":"Stripe, Inc."}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-agent-api.onrender.com%2Fapi%2Fv1%2Fcounterparty-check&method=POST
const res = await pay("https://x402-agent-api.onrender.com/api/v1/counterparty-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "domain": "stripe.com",
    "name": "Stripe, Inc."
  }),
});
console.log(res.status, await res.text());

# 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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402-agent-api.onrender.com/api/v1/counterparty-check",
        json={
            "domain": "stripe.com",
            "name": "Stripe, Inc.",
        },
    )
    print(res.status_code, res.text)