The x402 Bazaar

The x402 Bazaar is a discovery layer for x402 — a directory of x402-enabled resources (APIs, tools and services) that AI agents can browse programmatically to find paid endpoints, then pay for and call them automatically. It ships as part of the official Coinbase x402 project.

Instead of hard-coding which services to call, an agent queries the Bazaar to discover available x402 resources and their prices, picks one, and settles the HTTP 402 payment in USDC — all without a human in the loop.

The Bazaar is a machine-readable discovery service agents query at runtime. mpp.best is a human-browsable directory of the broader ecosystem — the open-source projects, SDKs and services around x402. They complement each other: use mpp.best to find tooling, the Bazaar for runtime service discovery.

Expose your endpoint with x402 (return an HTTP 402 with payment terms) and register it per the coinbase/x402 Bazaar conventions so agents can discover it. Tools like MCPay help you publish and monetize endpoints.

You can browse the 1.2k x402 projects we track in our directory, or start with the curated discovery tools and live services listed on this page.