The x402 ecosystem

x402 is bigger than any one vendor. Here's a curated, vendor-neutral slice of it — the facilitators, explorers, tools, and services worth a builder's time. Ours is one entry among many.

Start here

x402.org The protocol spec and the official ecosystem directory.
awesome-x402 Community-curated lists of SDKs, facilitators, and services.

Facilitators

Coinbase CDP Hosted facilitator across Base, Polygon, Arbitrum, World, and Solana, with a free tier.
Public facilitator list PayAI, Polygon, thirdweb, self-hostable x402.rs, and more — mirrored and compared in one place.

Discovery & explorers

x402 Bazaar Coinbase's discovery layer — agents find and pay for indexed services.
x402scan Discovery and analytics for paid x402 endpoints.
x402 Daily An ecosystem directory and ongoing news on x402.
Artemis On-chain analytics: x402 transaction volume and adoption.

SDKs & tools

coinbase/x402 Reference SDKs (TypeScript, Python, Go) and client wrappers for fetch and axios.

Services

AgentKV Encrypted, pay-per-request key-value storage for agents. (Ours.)

This is a curated slice. For the complete, fast-moving catalog, see x402.org/ecosystem and awesome-x402 — the Bazaar alone indexes many more services (Exa, Firecrawl, Serper, and growing).

Building on x402? Open a PR or issue — we're glad to point to good work, ours or not.