Build your AI wrapper product on a real backend, not a Next.js API route.
AI wrapper products — apps that add a specialized interface or workflow on top of LLM APIs — are one of the fastest-growing product categories. But most wrappers are built on fragile Next.js API routes or simple Flask scripts. FastAPI AI Kit gives you a production API backend that handles the hard parts: multi-model support, streaming, auth, and usage billing.
Why this matters for you
- →Your product's core is calling LLM APIs with a specialized prompt or workflow
- →You need to support multiple LLM providers without code changes
- →Usage-based billing (per query, per token) is your business model
- →Streaming responses are essential for user experience
- →You need API keys for B2B customers, not just end-user auth
What the kit gives you
- Multi-provider LLM support — switch between GPT-4o, Claude, and Gemini with env vars
- Usage-based Stripe billing — charge per token, per request, or per document processed
- API key auth for B2B — issue keys to customers with per-key rate limits
- SSE streaming built in — real-time token delivery without custom WebSocket setup
- Token tracking per request — know exactly what each customer costs and earns
- Production infrastructure — the wrapper is your innovation, not the API plumbing
The bottom line
AI wrapper products live or die on their backend infrastructure. The wrapper UI is relatively simple — the hard part is auth, billing, streaming, and multi-provider support. FastAPI AI Kit handles all of that, so you can focus on the prompt engineering and UX that make your wrapper worth paying for.
The backend that turns your AI wrapper from a prototype into a product.
FastAPI AI Kit ships with auth, LLM integration, RAG, streaming, and Stripe billing — pre-configured and production-ready. One purchase, lifetime updates.
Ready to ship your AI backend this weekend?
Join developers who skipped weeks of boilerplate and went straight to building.