01x402.org Facilitator—x402 Foundation
The default open facilitator for verifying and settling x402 payments on Base Sepolia. The zero-config starting point for every testnet integration.
PayAPI Market—PayAPI Market
x402-powered API marketplace ('UK's API Marketplace for AI Agents'). ~27 live APIs / 222 endpoints across property, companies, weather, vehicle and financial data. Agents discover and pay per request; settles in USDC on Base. Free to list, 3% platform fee.
PayAI—PayAI Network
Hosted x402 payment facilitator for usage-based AI agent, SaaS and app payments. Handles verification and instant (sub-second) settlement of stablecoin micropayments; also offers an x402 Echo Merchant test sandbox with refunded test transactions.
Cloudflare Monetization Gateway—Cloudflare
Charge for any web page, dataset, API, or MCP tool behind Cloudflare. Stablecoin settlement over x402 with no payments stack of your own. Waitlist opened July 1, 2026.
CrowPay—indie
Drop-in x402 payment middleware for ElysiaJS servers — add per-route USDC pricing to a Bun API in a few lines.
MCPay—microchipgnu
Payment layer for MCP servers and plain HTTP APIs. Wrap existing servers with per-call x402 pricing; includes hosted registry and createPaidMcpHandler tooling.
MetaMask mcp-x402—MetaMask
MCP server that signs x402 payment headers from a provided key — lets any MCP-capable agent pay for x402 resources without native wallet support.
Nevermined x402 Facilitator—Nevermined
Agent-payments platform providing an x402 facilitator that coordinates authorization, metering, entitlements and settlement. Supports pay-per-call in USDC on Base plus fiat (Stripe/bank); integrated via npm (TypeScript) and pip (Python) SDKs.
paid-mcp-starter—xpay.sh (xpaysh)
Starter templates for monetizing MCP servers three ways: no-code (xpay), DIY x402 (USDC, ~50 LOC), and Stripe metered billing. TypeScript, with demo tools (summarize, sentiment, keyword extraction).
PayMCP—PayMCP
Provider-agnostic Python payment middleware for MCP servers. Adds @price decorators for pay-per-request billing; supports x402 (USDC on Base and Solana) plus Stripe, PayPal, Coinbase Commerce and others, with Mode.AUTO selecting a provider by client capability.
x402 (Python / FastAPI)—Coinbase / x402 Foundation
Official x402 Python SDK on PyPI, providing FastAPI/Flask middleware to gate endpoints behind USDC payments plus an auto-pay client session for buyers.
x402 Bazaar (Discovery Layer)—Coinbase Developer Platform
CDP's discovery layer for x402. Indexes payable API endpoints (payment metadata plus on-chain trust signals) that settle through the CDP facilitator; browsable via GET /v2/x402/discovery/resources and a semantic /search. Services auto-list on first settled payment with discoverable:true.
x402 Example Servers—Coinbase / x402 Foundation
Official x402 example implementations (TypeScript, Python, Go) showing payment-gated HTTP endpoints and matching clients across Express, Next.js, Hono, FastAPI and more - reference starting points for building x402 sellers and buyers.
x402-express—Coinbase / x402 Foundation
Official Express.js middleware for x402. One line of middleware gates routes behind USDC payments and forwards signed payments to a facilitator's /verify and /settle endpoints; defaults to the x402.org facilitator on testnet.
x402-hono (@x402/hono)—Coinbase / x402 Foundation
Official Hono middleware for x402 (usable on Cloudflare Workers and other edge runtimes), gating routes behind USDC payments settled via an x402 facilitator.
x402-kit—bitrouter
Modular, framework-agnostic Rust SDK for building x402 integrations: x402-signer (buyer signing + reqwest middleware), x402-paywall (framework-agnostic HTTP middleware, Axum examples), and x402-core. Ships new networks without upstream PRs.
x402-mcp—Vercel (ethanniser)
Open-source wrapper over mcp-handler adding paidTool() to Next.js MCP servers, plus withPayment() for AI SDK clients. The reference x402+MCP integration.
x402-next—Coinbase / x402 Foundation
Official Next.js App Router middleware for x402, gating routes/handlers behind USDC payments verified and settled through an x402 facilitator.
x402-rs—x402-rs (open source)
Production-grade Rust toolkit for x402: protocol types, Axum server middleware (x402-axum), a reqwest client wrapper (x402-reqwest), and a self-hostable facilitator server binary with Docker images.
x402scan—Merit Systems
Ecosystem explorer/aggregator for x402 (live at x402scan.com). Lets users and agents discover x402 servers, monitor on-chain transaction volumes, and call resources via an embedded wallet; aggregates facilitator configs and accepts community resource registration.