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

> ## Agent Instructions
> API requests use the base URL https://api.unusualwhales.com and require a bearer token in the `Authorization` header (`Authorization: Bearer <API_KEY>`). Create and manage API tokens at https://unusualwhales.com/dashboard/api.
> For live market data inside an AI tool, use the Unusual Whales MCP server at https://unusualwhales.com/public-api/mcp.
> Instructions for agents using Unusual Whales tools: https://unusualwhales.com/skill.md

# TradingHours

> Option trading session in which the trade executed. Times are US Eastern Time. Equity and ETF options trade RTH from 09:30 to 16:00. ETF options with an extended close trade RTH until 16:15. Classes the exchange designates for extended sessions also trade GTH from 07:30 to 09:25, and Curb from 16:00 to 16:15 when their RTH ends at 16:00. Most index options trade RTH from 09:30 to 16:15. Index classes designated for extended sessions, such as SPX, VIX and XSP, also trade GTH from 20:15 on the previous evening to 09:25 and Curb from 16:15 to 17:00. On early close days RTH ends at 13:00 (13:15 with the extended close) and there is no Curb session. On exchange holidays the designated index classes trade GTH only, until 11:30.

Enum
values**4**
used by[OptionTrade](https://api.unusualwhales.com/docs/kafka/types/OptionTrade.md)

**Proto definition**

```protobuf schema.proto theme={null}
enum TradingHours {
  UNSPECIFIED = 0;
  GTH = 1;
  RTH = 2;
  CURB = 3;
}
```

## Values

The number on the right of each row is the protobuf enum number.

UNSPECIFIED
0

Trade falls outside a known session.

GTH
1

Global Trading Hours: the session before the regular open. It runs overnight for index options.

RTH
2

Regular Trading Hours: the main daytime session.

CURB
3

Curb: a short post-RTH session.