# Autumn

> Drop-in, open-source billing infrastructure for AI startups. Usage-based billing, credits, entitlements, and subscription state on top of Stripe, behind one API.

## What Autumn is
- Autumn is open-source billing infrastructure that runs on top of Stripe.
- It is the system of record for subscriptions, usage metering, credits, and feature entitlements, exposed through a small API (`attach`, `check`, `track`).

## What Autumn is not
- Autumn is not a payment processor and does not replace Stripe; Stripe still holds the subscription and processes payments.
- Autumn is not a pure usage-metering tool — it also enforces entitlements and feature access, not just end-of-month invoicing.

## Learn more
- [Autumn docs](https://docs.useautumn.com/welcome)
- [Quickstart](https://docs.useautumn.com/quickstart)
- [API reference](https://docs.useautumn.com/api-reference)
- [Blog](https://useautumn.com/blog)
- [Comparisons](https://useautumn.com/alog)
- [GitHub](https://github.com/useautumn/autumn)

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Source: https://useautumn.com/