x402 Directory

Foundation governing the x402 protocol standard and ecosystem development.

Official protocol specification site and canonical documentation.

Original SDK and facilitator -- the reference implementation that started it all.

CDN-level x402 integration enabling payment-gated content at the edge.

AI Gateway with 600+ services, trust scoring, and intelligent routing.

Real-time analytics, monitoring, and uptime tracking for x402 services.

Autonomous agent wallets powering 50M+ x402 transactions and counting.

Stellar network facilitator enabling x402 payments on Stellar rails.

Ripple/XRPL facilitator bringing x402 to the XRP Ledger ecosystem.

Official Python SDK for building x402-compatible clients and servers.

Official TypeScript SDK for Node.js and browser-based x402 integrations.

Open-source Python implementation of the x402 protocol for self-hosters.

Mock server for testing x402 payment flows without real transactions.

Machine-readable service discovery indexing 251+ x402 services.

Smart routing layer that finds optimal paths across x402 services.

Community-curated lists of x402 projects, tools, and resources.

MCP server enabling AI agents to search and discover x402 services.

Educational resources, tutorials, and guides for x402 newcomers.