> ## 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

# RiskReversalSkew

> RiskReversalSkew captures the volatility skew between puts and calls at a given delta for a single expiry for a given ticker. NOTE: The ticker is not part of the message. The ticker is the key of the kafka msg.

Message
fields**4**
topic[risk-reversal-skew](/docs/kafka/topics/risk-reversal-skew.md)

**Proto definition**

```protobuf schema.proto theme={null}
message RiskReversalSkew {
  uint32 date = 1;
  uint32 expiry = 2;
  double skew = 3;
  uint32 delta = 4;
}
```

## Fields

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

date
uint32
1

The trading date as days since 1970-01-01

expiry
uint32
2

The expiry of the chain as days since 1970-01-01

skew
double
3

The put implied volatility minus the call implied volatility at the given delta. A positive value means puts are more expensive than calls

delta
uint32
4

The delta bucket as a whole number out of 100. 25 means the 0.25 delta and 10 means the 0.10 delta.