| Name | Type | Description | Notes |
|---|---|---|---|
| id | Number | Order Book ID. Increases by 1 on every order book change. Set `with_id=true` to include this field in response | [optional] |
| current | Number | Response data generation timestamp | [optional] |
| update | Number | Order book changed timestamp | [optional] |
| asks | [FuturesOrderBookItem] | Asks order depth | |
| bids | [FuturesOrderBookItem] | Bids order depth |