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

# Authentication

> Authenticate public API requests with project API keys.

APIAny.AI public endpoints use API keys.

<Snippet file="snippets/auth-header.mdx" />

## Security model

API keys are project credentials. Treat them like passwords:

* Do not expose secret API keys in browser-side code.
* Store keys in a server-side secret manager or environment variable.
* Rotate keys if they are leaked.
* Use separate keys for development, staging, and production.

## Example

```bash theme={null}
curl https://apiany.ai/v1/models \
  -H "Authorization: Bearer $APIANY_API_KEY"
```

## Errors

Authentication errors use the platform error format:

```json theme={null}
{
  "error": {
    "type": "auth_error",
    "message": "Invalid API key"
  }
}
```