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

# Authentication

> You can obtain your API key from your urlDNA account page.

## Obtain an API Key

Sign up on [urlDNA](https://urldna.io) and go to your profile page.

## Authentication

The API uses API key authentication to ensure secure access. To authenticate requests, include your API key in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Base URL

All API endpoints are accessible under the following base URL:

```
https://api.urldna.io
```

The current API version is **v1**.

```
https://api.urldna.io/v1
```

If no version is specified in the URL, the latest version will be used by default.

## Response Format

Responses are returned in JSON format. Ensure that your client application can parse and handle JSON data efficiently.