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

# Authentication

> API keys and rate limits

Pass your raw API key in the Authorization header on every request (same convention as Mobula - zero migration friction).

```
Authorization: YOUR_API_KEY
```

**Rate limits** : 300 requests/minute per key. Standard X-RateLimit-\* headers on every response; 429 with Retry-After when exceeded.