Stable402

Reference implementations for the x402 agentic payment protocol ecosystem — built in public on Cloudflare Workers.

What We Build

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:

1. Implement the official quickstart (Coinbase, Cloudflare, Google, Stripe, Solana)
2. Port to Cloudflare Workers — the part vendor DevRel won't do for you
3. Connect protocols together — the integration layer nobody else has incentive to build

Repositories

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.

Built on

Cloudflare Workers · Cloudflare Agents SDK · Base (Sepolia) · x402 · AP2 · Astro 6

Reference

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