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

# Introduction

> What is Nozle and who is it for

Nozle is an AI billing and margin intelligence platform. It gives AI companies usage-based billing, real-time entitlements, and per-customer margin visibility in a single integrated stack.

## Who is Nozle for?

Nozle is built for AI companies that:

* Bill customers based on API calls, tokens, compute time, or other usage metrics
* Need real-time visibility into per-customer and per-model costs
* Want feature gating and usage limits without building entitlement logic from scratch
* Use Stripe for payments and need managed checkout flows

## Key capabilities

| Capability                 | What it does                                                                |
| -------------------------- | --------------------------------------------------------------------------- |
| **Usage-based billing**    | Meter any event, aggregate in real time, and invoice automatically          |
| **Real-time entitlements** | Feature gates and usage limits evaluated at the edge with sub-100ms latency |
| **Margin intelligence**    | Per-customer, per-model cost tracking so you know your true margins         |
| **Stripe checkout**        | Embedded checkout and subscription management with no custom Stripe code    |

## Architecture

Nozle is built around two layers:

1. **Nozle API** -- The backend that handles Stripe checkout, margin analytics, entitlement evaluation, and usage event ingestion. Runs at `api.nozle.app`.

2. **SDKs** -- Client and server libraries that connect your application to Nozle.

<Info>
  You interact with Nozle through the SDKs or REST API -- all the complexity of billing, entitlements, and margin lives behind a single API surface.
</Info>

## SDKs

Nozle ships three SDKs:

* **`@nozle-js/react`** -- 25+ billing components and hooks for React apps. Checkout buttons, usage meters, plan selectors, and a full billing portal out of the box.
* **`@nozle-js/node`** -- Server-side billing operations and event tracking for Node.js. Report usage events, check entitlements, manage customers.
* **`nozle-sdk`** (Python) -- Server-side billing for Python backends. Same capabilities as the Node SDK.

## Production URLs

| Service   | URL                                      |
| --------- | ---------------------------------------- |
| Dashboard | [app.nozle.app](https://app.nozle.app)   |
| API       | [api.nozle.app](https://api.nozle.app)   |
| Docs      | [docs.nozle.app](https://docs.nozle.app) |

## Next steps

Head to the [Quickstart](/guides/getting-started/quickstart) to integrate Nozle into your app in under 10 minutes, or read [Architecture](/guides/getting-started/architecture) for a deeper look at how the system fits together.