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

# Fractal API Authentication: API Keys and Bearer Tokens

> Learn how to authenticate requests to the Fractal API using your API key via the Authorization Bearer header or the x-api-key header.

All API requests require your Belvedir API key. Keys start with `fr_live_` and are shown once at creation — store them securely.

## Bearer token

```bash theme={null}
curl https://platform.belvedir.ai/api/v1/traces \
  -H "Authorization: Bearer fr_live_..."
```

## x-api-key header

```bash theme={null}
curl https://platform.belvedir.ai/api/v1/traces \
  -H "x-api-key: fr_live_..."
```

Both headers are accepted. Choose whichever fits your HTTP client.