# Rate limiting

## Rate limiting
**Only one batch operation per host can be in progress at a time.** While a previous batch is still `PENDING` or `PROCESSING`, new batch requests are rejected with `429 Too Many Requests`:

```json
{
  "status": "FAILED",
  "message": "A batch request is still being processed. Please wait until all users are processed before submitting a new one."
}
```
This applies independently to pause/resume batches and to close batches.

Version: v3

## Description:

  - `Rate limiting` ()
    Only one batch operation per host can be in progress at a time. While a previous batch is still PENDING or PROCESSING, new batch requests are rejected with 429 Too Many Requests: {
  "status": "FAILED",
  "message": "A batch request is still being processed. Please wait until all users are processed before submitting a new one."
}
{
  "status": "FAILED",
  "message": "A batch request is still being processed. Please wait until all users are processed before submitting a new one."
} This applies independently to pause/resume batches and to close batches.