Live x402 endpoint on Cloudflare Workers: an agent pays for a pre-deploy release check

[genesiscode2026]

The examples/x402 and examples/x402-mcp demos run a local server + client on Base Sepolia. Sharing the same pattern against a live mainnet endpoint in case it's a useful reference.

A pre-deploy release gate: before wrangler deploy, an agent calls a paid x402 endpoint that diffs two API/schema versions and returns a SAFE / REVIEW / BLOCK verdict, then pays ~$0.005 USDC on Base mainnet. The endpoint is a Cloudflare Worker using x402 v2 (no account, USDC on Base).

Live endpoint:
POST https://genesis-agent-tools.genesisagenttools.workers.dev/api/flagships/release-guardian

• First call → HTTP 402 with a Payment-Required header (x402 v2, $0.005, Base USDC).
• Retry with a signed Payment-Signature header → { ok, verdict, reasons, evidence }.

It's the standard @x402/fetch flow: wrapFetchWithPayment(fetch) → POST → 402 → sign → retry → verdict.

Happy to contribute a runnable example to examples/x402/ (gate a deploy behind a live paid check) if that fits — posting here first to confirm the pattern against a real endpoint.