> ## 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

# OptionExchange

> An option exchange identified by its Market Identifier Code.

Message
fields**2**
used by[OptionState](https://api.unusualwhales.com/docs/kafka/types/OptionState.md)
used by[OptionTrade](https://api.unusualwhales.com/docs/kafka/types/OptionTrade.md)

**Proto definition**

```protobuf schema.proto theme={null}
message OptionExchange {
  int32 id = 1;
  string code = 2;
}
```

## Fields

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

id
int32
1

Internal unique ID for the option exchange.

code
string
2

ISO 10383 Market Identifier Code.