TypeScript client

npm install @x402/core @x402/evm @x402/axios axios viem

import { x402Client } from "@x402/core/client";
import { UptoEvmScheme } from "@x402/evm/upto/client";
import { wrapAxiosWithPayment } from "@x402/axios";
import { privateKeyToAccount } from "viem/accounts";
import axios from "axios";

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);

// upto scheme = authorize max, settle on delivery
const client = new x402Client();
client.register("eip155:8453", new UptoEvmScheme(account));

const api = wrapAxiosWithPayment(
  axios.create({ baseURL: "https://api.sms-x402.xyz" }),
  client,
);

// 1. order — payment handled automatically (402 → sign → retry)
const order = await api.post("/v1/numbers", { service: "tg", country: 16 });
const { id, accessToken, number } = order.data;
console.log("number:", number);

// 2. use the number in the target service, then poll
for (;;) {
  await new Promise((r) => setTimeout(r, 7000));
  const res = await api.get(`/v1/numbers/${id}`, {
    headers: { Authorization: `Bearer ${accessToken}` },
  });
  if (res.data.status === "completed") {
    console.log("SMS code:", res.data.code);
    break;
  }
  if (res.data.status !== "waiting_code") {
    throw new Error(`activation ended: ${res.data.status}`);
  }
}

await api.post(`/v1/numbers/${id}/cancel`, null, {
  headers: { Authorization: `Bearer ${accessToken}` },
});