Up · Stamp Duty

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://web-production-18a32.up.railway.app/stamp-duty", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "is_additional_property": false,
    "is_first_time_buyer": false,
    "is_non_resident": false,
    "price": 350000
  }),
});
const data = await res.json();

curl -X POST \
  "https://web-production-18a32.up.railway.app/stamp-duty" \
  -H "Content-Type: application/json" \
  -d '{"is_additional_property":false,"is_first_time_buyer":false,"is_non_resident":false,"price":350000}' \
  -H "X-PAYMENT: <signed x402 payment>"

{
  "breakdown": [
    {
      "band": "£0 – £125,000",
      "rate": "0.0%",
      "tax": 0
    },
    {
      "band": "£125,000 – £250,000",
      "rate": "2.0%",
      "tax": 2500
    },
    {
      "band": "£250,000 – £350,000",
      "rate": "5.0%",
      "tax": 5000
    }
  ],
  "buyer_type": "Standard",
  "effective_rate": 2.14,
  "price": 350000,
  "total_tax": 7500
}