| Name | Type | Description | Notes |
|---|---|---|---|
| conid | i32 | conid of the future contract | [optional] [default to null] |
| expiration_date | String | [optional] [default to null] | |
| ltd | String | last trading day | [optional] [default to null] |
| symbol | String | [optional] [default to null] | |
| underlying_conid | i32 | [optional] [default to null] |