Show HN: HostAI - free Airbnb listing optimizer (Cloudflare Workers + Claude AI, $0 infra)

Built HostAI to optimize Airbnb, Booking.com and Vrbo listings with AI.

Paste title + description, pick platform, get an optimized listing in 30 seconds. No signup.

Stack (zero monthly cost)

• Cloudflare Workers + KV for API and rate limiting
• Claude Haiku for AI (~0.5c per call)
• Brevo for transactional email
• Stripe Payment Links (no checkout page to build)

Pro activation without Stripe webhooks

Capture email before Stripe redirect via sessionStorage. On return, page detects session_id=cs_live_xxx in URL, POSTs to /activate-pro. Worker validates prefix, generates token, stores in KV, emails via Brevo.

No webhooks. No database. Just KV.

Links

• Optimizer: https://hostai.pages.dev
• Full audit product: https://hostscan.pages.dev
• Source: https://github.com/aidaserviceas-glitch/hostai