Screen

{
  "data": {
    "candidates": [
      {
        "entity_type": "entity",
        "list": "sdn",
        "match_confidence": 100,
        "match_reasons": [
          "exact_normalized_name"
        ],
        "name": "BANCO NACIONAL DE CUBA",
        "programs": [
          "CUBA"
        ],
        "uid": 306
      }
    ],
    "query": {
      "name": "Banco Nacional de Cuba"
    }
  },
  "meta": {
    "disclaimer": "This response is an assistive screening signal derived from public government data. It is not a certified compliance determination, a consumer report, or legal advice.",
    "generated_at": "2026-07-11T12:00:00.000Z",
    "service": "sanctions-screener",
    "source_datasets": [
      {
        "last_synced_at": "2026-07-11T12:00:00.000Z",
        "name": "OFAC Specially Designated Nationals (SDN) List",
        "upstream_published_at": "2026-07-10T00:00:00-04:00"
      },
      {
        "last_synced_at": "2026-07-11T12:00:00.000Z",
        "name": "OFAC Consolidated (non-SDN) List",
        "upstream_published_at": "2026-07-10T00:00:00-04:00"
      }
    ],
    "version": "0.1.0"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tollbooth-sanctions-screener-testnet.sjwilliams8.workers.dev/screen' \
  -H 'content-type: application/json' \
  --data-raw '{"name":"Banco Nacional de Cuba"}'

# 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://tollbooth-sanctions-screener-testnet.sjwilliams8.workers.dev/screen' \
  -H 'content-type: application/json' \
  --data-raw '{"name":"Banco Nacional de Cuba"}' \
  | 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 $0.01 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%2Ftollbooth-sanctions-screener-testnet.sjwilliams8.workers.dev%2Fscreen&method=POST
const res = await pay("https://tollbooth-sanctions-screener-testnet.sjwilliams8.workers.dev/screen", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "name": "Banco Nacional de Cuba"
  }),
});
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 $0.01 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.post(
        "https://tollbooth-sanctions-screener-testnet.sjwilliams8.workers.dev/screen",
        json={
            "name": "Banco Nacional de Cuba",
        },
    )
    print(res.status_code, res.text)