Ship an AI SaaS without wiring up billing from scratch.

Google sign-in, Stripe subscriptions with usage-based AI metering, and a Claude streaming chat endpoint — already wired together. No database required.

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What's wired up

Auth.js (Google OAuth), JWT sessions, protected /dashboard routes via middleware.
Stripe Checkout + Billing Portal, subscription status checked live — no local DB.
Stripe Billing Meters: AI token usage is reported per request for usage-based billing.
Claude API streaming chat, plain-text streamed response, easy to adapt to any UI.
DEMO_MODE flag for a safe public preview deploy (cheaper model, shorter replies, cookie-based rate limit, no live Checkout) — see README.