> ## Documentation Index
> Fetch the complete documentation index at: https://docs.revstack.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Monetize your software in minutes. The open-source Billing OS for modern SaaS.

Building and maintaining an internal billing system is a massive resource sink for engineering teams. **Revstack** solves this by treating billing as infrastructure. We decouple your application's business logic from payment providers, eliminate webhook hell, and give you a centralized engine to control your revenue.

Whether you are launching a B2B SaaS, an AI wrapper with metered tokens, or a pay-as-you-go API, Revstack abstracts the chaos of billing states into clean, predictable primitives.

## The Revstack Philosophy

We believe pricing should be defined in your codebase, not clicked through in a dashboard.

* **Billing as Code:** Define your plans, entitlements, and limits in a single `revstack.config.ts`. Version it, review it in PRs, and push it to the edge with our CLI.
* **Zero Webhooks:** Stop maintaining fragile endpoint handlers. Revstack orchestrates the subscription lifecycle for you so you can query the current state directly instead of reacting to events.
* **Agnostic Gateway:** Bring your own identity (Clerk, Supabase, Auth0) and charge through any provider (Stripe, Polar). Switch gateways without touching your app logic.

***

## Explore the Engine

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/guides/quickstart">
    From codebase to first revenue in minutes. Deploy the engine locally and make your first API call.
  </Card>

  <Card title="Billing as Code" icon="file-code-2" href="/guides/billing-as-code">
    Learn how to define your pricing truth in code and sync it using the Revstack CLI.
  </Card>

  <Card title="Entitlements & Access" icon="lock" href="/guides/entitlements">
    Gate features in one line. Check boolean, metered, or JSON primitives in sub-milliseconds at the edge.
  </Card>

  <Card title="Wallets & Metering" icon="wallet" href="/guides/metering">
    Issue prepaid AI credits, auto-deduct usage in real-time, and smoothly fallback to overage rates.
  </Card>
</CardGroup>

## Drop-in Monetization UX

Don't reinvent the wheel. Revstack provides fully localized, high-converting interfaces so you can focus on building your core product.

<CardGroup cols={2}>
  <Card title="Hosted Checkout" icon="credit-card" href="/guides/checkout">
    Drop-in payment pages optimized for conversions, prorations, and global tax compliance.
  </Card>

  <Card title="Self-Serve Portal" icon="square-user" href="/guides/customer-portal">
    Zero-code dashboards for your users to upgrade plans, manage seats, and download invoices.
  </Card>
</CardGroup>