Easy x402 Payments with 1Shot API

x402 is a payment standard proposed by Coinbase that enables API services to charge for access by piggybacking on top of the existing HTTP 402 status code. Specifically, x402 enables API customers, particularly AI agents, to pay for and gain access to premium API resources by cryptographically signing (see EIP-712) time-bound value transfers that are executed onchain by a fascilitator (e.g. 1Shot API).

This demo focuses on FastAPI as the web server framework and leverages Pydantic for data validation of the x402 payload specifications.

Specifically, we show how FastAPI route dependencies can be used to implement x402 payments while being minimally invasive to your existing codebase.

Check out the github repo for this tutorial here.