x402 Paywall Launch Diagnostic

Public-safe diagnostic for one candidate paid API endpoint: integration path, route/pricing sketch, HTTP 402 test checklist, blocker notes, and 72-hour launch plan. Latest proof refreshed 2026-05-25T06:49Z: manifest 200 with 13 resources; unpaid paid GET and paid POST routes return correct Base USDC 402 requirements. Reliability note: recent sqlite write-path 500 cluster investigated; hardening queued before stronger uptime claims. Intake requires public docs/API details only; never send secrets, private keys, seed phrases, API keys, or customer private data.