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

# Period IDs

Periods define the time segment of a game that a market applies to. Each period has a numeric `period_id`. Prematch and live periods use separate ID ranges.

## Prematch Periods

| Period | ID | Description |
| - | - | - |
| Full Game | 0 | Prematch full game |
| 1st Half | 1 | Prematch first half |
| 2nd Half | 2 | Prematch second half |
| 1st Quarter/Period | 3 | Prematch Q1 |
| 2nd Quarter/Period | 4 | Prematch Q2 |
| 3rd Quarter/Period | 5 | Prematch Q3 |
| 4th Quarter/Period | 6 | Prematch Q4 |

<Note>
  Tennis uses `period_id=0` for prematch full-match markets. Set-specific prematch markets reuse period IDs `3` and `4` for Set 1 and Set 2.
</Note>

## Live / In-Play Periods

| Period | ID | Description |
| - | - | - |
| Live Full Game | 7 | In-play full game |
| Live 1st Half | 13 | In-play 1st half |
| Live 2nd Half | 14 | In-play 2nd half |
| Live 1st Quarter | 15 | In-play Q1 |
| Live 2nd Quarter | 16 | In-play Q2 |
| Live 3rd Quarter | 17 | In-play Q3 |
| Live 4th Quarter | 18 | In-play Q4 |

<Note>
  Tennis uses `period_id=7` for live full-match markets. Live set-specific markets use `period_id=15` for Set 1 and `period_id=16` for Set 2.
</Note>

## V1 Best-Line Period Names

In the V1 best-line endpoint, periods are referenced by string names rather than numeric IDs. The mapping is as follows:

| Numeric ID | V1 Period Name |
| - | - |
| 0 | `period_full_game` |
| 1 | `period_first_half` |
| 2 | `period_second_half` |
| 3 | `period_first_period` |
| 4 | `period_second_period` |
| 5 | `period_third_period` |
| 6 | `period_fourth_period` |


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