x402 Playground
NAME
    x402.matija.eu — pay-per-request API using the x402 protocol

SYNOPSIS
    /
    /payment-info
    /api/data
    /api/status

DESCRIPTION
    This service gates API endpoints behind x402 micropayments.
    Requests without payment receive HTTP 402 with a PAYMENT-REQUIRED
    header. Browsers get an interactive paywall; programmatic clients
    get machine-readable payment instructions.

ENDPOINTS
    GET /
        This page.

    GET /payment-info
        Machine-readable JSON with the payment configuration:
        network, token, price, facilitator URL, and payment flow.

    GET /api/data                                    [protected]
        Returns example JSON data. Costs 1 USDC on Polygon.
        Without payment you get HTTP 402 + payment instructions.

    GET /api/status                                  [protected]
        Returns server status. Costs 1 USDC on Polygon.

PAYMENT FLOW
    1. Request a protected endpoint.
    2. Receive HTTP 402 + PAYMENT-REQUIRED header (base64 JSON).
    3. Sign a USDC transferWithAuthorization with your wallet.
    4. Resend the request with the PAYMENT-SIGNATURE header.
    5. The facilitator verifies + settles the payment on-chain.
    6. Receive the protected resource.

    In a browser, steps 2–5 are handled by the built-in paywall UI.
    Just open a [protected] link above and pay with your wallet.

CONFIGURATION
    Protocol        x402 v2
    Network         Polygon mainnet (eip155:137)
    Token           USDC (0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359)
    Price           1 USDC per request
    Pay to          0x91FdcfCAdfA7E660c70D9641257542deD2a2d384
    Facilitator     https://facilitator.payai.network

SEE ALSO
    x402 protocol   https://docs.x402.org