x402 Directory

Foundation governing the x402 protocol standard and ecosystem development. 22+ founding members including Coinbase, Cloudflare, Stripe, Visa, and AWS.

Official protocol specification site, whitepaper, and canonical documentation for the x402 standard.

Original SDK and facilitator -- the reference implementation that started it all. Go + TypeScript, multi-chain support.

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

AI Gateway with 600+ x402 services, trust scoring, and intelligent routing across the ecosystem.

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

Autonomous agent wallets for AI agents. Enables agents to hold, send, and receive USDC on Base for x402 payments.

Subscription payment channels on Stellar using x402. Stream payments, not transactions -- 1,000 API calls = 2 on-chain transactions.

Production-grade Rust implementation with Axum middleware, Reqwest client wrapper, and self-hostable facilitator.

Official Python SDK on PyPI for building x402-compatible clients and servers. FastAPI middleware + requests session with auto-payments.

Official TypeScript SDK for Node.js and browser-based x402 integrations. Core protocol types, verification, and settlement.

Wire-compatible Python protocol layer. Can be used standalone for protocol parsing or with ag402-core for a full payment engine.

Test/mock implementation of x402 for EVM blockchains. Test payment flows without live transactions.

Machine-readable service discovery indexing 251+ x402 services. The authoritative registry for the ecosystem.

The largest x402 directory with 17K+ listings. Human-browsable index of services, tools, and projects.

Community-curated list of x402 projects, SDKs, tools, facilitators, and ecosystem data. 300+ resources. Maintained by 24K Labs.

Complete implementation guide, API reference, quickstarts, and network support documentation from Coinbase Developer Platform.

Python SDK for x402 payments -- pay and charge for APIs with stablecoins. pip installable, OpenClaw compatible.