x402 facilitator (local testnet)

Coinbase Facilitator is a payment service in the x402 flow that verifies payment signatures and submits transactions to the blockchain.

x402 is an open standard and protocol for internet-native payments over HTTP. It lets resource servers declare payment requirements for endpoints through middleware, while clients and payment facilitators handle payment schemes without requiring the server to manage details such as gas or RPC access. The protocol is designed to support multiple networks, tokens, currencies, signing standards, and payment schemes, including crypto and potentially fiat-based systems. Reference SDKs and integrations are available for TypeScript, Python, and Go, with adapters for frameworks and clients including Express, Fastify, Fetch, Hono, Next.js, and Axios. The project is intended to be openly accessible, backward-compatible where possible, and trust-minimizing: facilitators and resource servers should not move funds beyond the client's stated intentions.

A website for monitoring real transaction volume on the x402 agent-payment protocol.

Bazaar is an x402 directory where buyers discover sellers of data and API services. It is associated with x402, a protocol that lets AI agents pay for data and APIs through small on-chain payments made over HTTP.

Base Sepolia is a test network used as the safe environment for executing and guarding x402 payment runs and attacks involving AI-agent payments.