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

# Rate Limiting

> How SendyKit communicates API rate limits

## Response headers

SendyKit returns standard rate-limit headers:

```text theme={null}
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 97
X-RateLimit-Reset: 1710345600
```

## What to do

* retry after the reset window
* keep writes idempotent with `Idempotency-Key`
* use API keys for stable automation
* reserve machine payments for premium actions, not every request

## Public readiness endpoints

The public readiness endpoints are separately rate-limited because they are browser-accessible:

* `/sendykit/api/v2/system/readiness/evaluate`
* `/sendykit/api/v2/system/readiness/inboarding`
* `/sendykit/api/v2/system/readiness/report/{id}`

Those routes are intentionally narrower than the main authenticated API.