# x402 client quickstart

This API uses exact USDC payments on Base. It charges $0.03 for one single or batch request. The signer must be supplied by the buyer's own secure wallet flow; never send a private key to this API.

## Node.js example

```js
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";

const signer = /* your secure Base EVM signer */;
const client = new x402Client();
client.register("eip155:*", new ExactEvmScheme(signer));
const paidFetch = wrapFetchWithPayment(fetch, client);

const response = await paidFetch("https://global-business-day-planner-paid.kgy5612.workers.dev/v1/business-day-plan/batch", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ requests: [
    { countryCode: "US", startDate: "2026-11-24", businessDays: 3 },
    { countryCode: "GB", startDate: "2026-12-22", businessDays: 5 }
  ] })
});
console.log(response.status, await response.json());
```

The client receives HTTP 402, signs locally, retries, and receives HTTP 200 after a successful settlement.

See https://global-business-day-planner-paid.kgy5612.workers.dev/openapi.json for the full schema.