Reference implementations for the x402 agentic payment protocol ecosystem — built in public on Cloudflare Workers.
x402 is the HTTP 402 payment standard for machine-to-machine commerce. Stable402 fills the gap between protocol specs and production-ready code: every POC implements the official vendor quickstart, ports it to Cloudflare Workers, then bridges across the ecosystem.
Three-layer build pattern:
- Implement the official quickstart (Coinbase, Cloudflare, Google, Stripe, Solana)
- Port to Cloudflare Workers — the part vendor DevRel won't do for you
- Connect protocols together — the integration layer nobody else has incentive to build
| Repo | What it is |
|---|---|
| stable402.com | Astro 6 + Starlight site — reference pages, transit map, interactive demos |
| x402-worker-middleware | x402 payment middleware for Cloudflare Workers (POC 1) |
| x402-paid-tool-mcp | paidTool MCP server on Cloudflare Agents SDK (POC 2) |
| ap2-x402-bridge | AP2 mandate → x402 settlement bridge (POC 3) |
| x402-stripe-facilitator | Stripe as x402 facilitator with fiat off-ramp (POC 4) |
| x402-multichain-settlement | Base vs Solana x402 settlement comparison (POC 5) |
| x402-signed-agents | Signed Agents + x402 dual-gate (POC 6) |
| x402-nanopayments | Circle Nanopayments aggregation with x402 (POC 7) |
| x402-sandbox | Durable Objects interactive x402 sandbox (POC 8) |
| x402-pay-per-crawl | AI Crawl Control + x402 publisher monetization (POC 9) |
| agentic-payments-transit-map | Beck-style interactive transit map of the agentic payments ecosystem (POC 10) |
POC repos are created as each build begins. Only active repos are listed here.
Cloudflare Workers · Cloudflare Agents SDK · Base (Sepolia) · x402 · AP2 · Astro 6
Every POC has a companion reference page on Stable402.com with architecture diagrams, code walkthroughs, and integration guides.
For consulting or sponsorship: Leo@Stable402.com