# invalid_batch

URL: /evidence/errors/invalid_batch · Id: `error:invalid_batch`

> The Batch body is not a list of 1 to 100 calls.

The `invalid_batch` [Problem](/evidence/errors) means: the [Batch](/reference/concepts#batch) body is not a list of 1 to 100 calls.

## Answer
| Status | Title |
| --- | --- |
| 400 | Bad Request |

```json
{
  "type": "about:blank",
  "title": "Bad Request",
  "status": 400,
  "detail": "What went wrong, in words.",
  "code": "invalid_batch"
}
```

## Fix
Send `{"calls": [...]}` with 1 to 100 items, each a verb and its input.