> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fill3d.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Using Fill 3D in your apps.

Fill 3D provides a public API for making generations in your own application:

## Authenticating Requests

All requests must be authenticated with an active API key.
Generate your API key at [fill3d.ai](https://fill3d.ai):

![create api key](https://www.fill3d.ai/api-key.gif)

Provide your API key in the `Authorization` header in all requests:

```
Authorization: Bearer <API KEY>
```

## Purchasing Credits

You must purchase API credits to create generations using our API. Head over to [fill3d.ai](https://www.fill3d.ai)
and open the "API Keys" dialog from your user button to view your current balance.

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## Cloning the Starter Project

We offer a starter project that illustrates the Fill 3D API integration workflow, built with NextJS:

<Card title="Clone the Starter Project" icon="github" href="https://github.com/fill3d/fill" horizontal>
  Head over to GitHub to clone the starter project. And Make sure to ⭐ us on GitHub!
</Card>