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FastAPI AI Kit as a general-purpose AI backend boilerplate.

If you're evaluating boilerplates for an AI product broadly — not tied to one specific application — FastAPI AI Kit's core layer (auth, LLM abstraction, RAG, billing, background jobs) is the general-purpose starting point most AI backends need, regardless of the specific product built on top.

FastAPIOpenAI / Anthropicpgvector / QdrantPostgreSQLRedisStripe

The usual pain points

  • Rebuilding the same auth/billing/rate-limiting layer for every new AI product idea
  • Choosing and wiring an LLM abstraction before writing any product logic
  • Standing up async infrastructure (Celery, Redis) before you can process anything in the background
  • Deciding on a vector store and RAG pattern before you've validated the product idea

How the kit solves them

  • One backend covers auth, billing, and rate limiting regardless of the AI product built on top
  • Unified LLM layer means switching providers later doesn't touch business logic
  • RAG pipeline is available from day one if the product needs it, unused if it doesn't
  • Background job infrastructure is already wired for whatever async workload comes up

Example implementation

main.py
# The same core stack, regardless of what you build on top
@router.post("/v1/{your_feature}")
@require_api_key(tier=["basic", "pro"])
@rate_limit(per_minute=60)
async def your_endpoint(body: YourRequest, key: APIKey = Depends(get_api_key)):
    response = await llm.chat(messages=build_prompt(body), track_tokens=True)
    await meter.record(key.id, response.tokens)
    return {"result": response.content}

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