Send Check

{
  "answer": {
    "cautions": [
      {
        "code": "issuer_can_claw_back",
        "detail": "The issuer can claw back this token from holders (normal for regulated stablecoins)."
      },
      {
        "code": "tag_not_enforced",
        "detail": "This account does not require a tag, but shared exchange accounts sometimes need one anyway. Confirm with the recipient."
      }
    ],
    "passed": [
      "destination_exists",
      "trust_line_exists"
    ],
    "payment": {
      "amount": "5",
      "currency": "RLUSD",
      "destination": "r36sbDCAsaCj44ZUXWY2jjGE1jBpsCoRQ4",
      "destination_tag": null,
      "issuer": "rMxCKbEDwqr76QuheSUMdEGf4B9xJ8m5De",
      "source": null
    },
    "reserve_xrp": {
      "base": "1.0",
      "per_object": "0.2"
    },
    "summary": "This payment should go through, but read the cautions first.",
    "verdict": "send_with_caution",
    "will_fail_because": []
  },
  "checked_at": "2026-10-18T03:48:45+00:00",
  "proof": {
    "ledger_index": 107731438,
    "network": "xrpl:0 (mainnet)",
    "sources": [
      {
        "method": "account_info, account_lines, deposit_authorized",
        "name": "XRP Ledger public server",
        "url": "https://s1.ripple.com:51234/"
      }
    ],
    "validated": true
  },
  "service": "send_check",
  "unknowns": [
    "Whether the destination is the person or service you intend (the ledger records no identity).",
    "Off-ledger rules of exchanges, such as minimum deposits or tags they need but do not enforce on-ledger."
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://bruk-agent-api.fly.dev/v1/send-check?amount=5&currency=RLUSD&destination=r36sbDCAsaCj44ZUXWY2jjGE1jBpsCoRQ4'

# 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://bruk-agent-api.fly.dev/v1/send-check?amount=5&currency=RLUSD&destination=r36sbDCAsaCj44ZUXWY2jjGE1jBpsCoRQ4' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fbruk-agent-api.fly.dev%2Fv1%2Fsend-check
const res = await pay("https://bruk-agent-api.fly.dev/v1/send-check?amount=5&currency=RLUSD&destination=r36sbDCAsaCj44ZUXWY2jjGE1jBpsCoRQ4");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://bruk-agent-api.fly.dev/v1/send-check?amount=5&currency=RLUSD&destination=r36sbDCAsaCj44ZUXWY2jjGE1jBpsCoRQ4")
    print(res.status_code, res.text)