monetize-service

You can monetize an Express API by building an x402 payment-protected server that returns HTTP 402 requirements and accepts USDC payments per request on Base. It configures pricing, network, and pay-to address for each route so other agents pay to access your endpoint.

The x402 payment middleware intercepts requests to your Express routes and returns HTTP 402 payment requirements. When calling agents pay the per-request USDC fee on Base, the middleware verifies the transaction and allows access to your research, enrichment, or computation service.

Yes, you can charge per request for a data endpoint by applying x402 payment middleware to your Express routes. This configures exact per-request pricing in USDC on Base mainnet or Base Sepolia, allowing automated agents to pay exactly for the calls they make.

To make your paid API discoverable, register discovery extension metadata with the x402 Bazaar during your server setup. This allows other agents to automatically find your priced endpoints and confidently call them after processing the USDC payment requirements.

Before configuring per-request pricing, you need an authenticated x402 wallet, an HTTP facilitator-backed x402 resource server, and registered payment schemes for Base networks. You then apply paymentMiddleware to your Express routes with the desired price, network, and payTo address.