# Historical Risk Reversal Skew

`GET` `https://api.unusualwhales.com/api/stock/{ticker}/historical-risk-reversal-skew`

Returns the historical risk reversal skew (the difference between put and call volatility) at a delta of 25 or 10 (colloquial for 0.25 or 0.1) for a given expiry date.


## Authentication

```
Authorization: Bearer YOUR_API_KEY
```

## Path Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| `ticker` | SingleTicker | Yes | A single ticker |

## Query Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| `date` | Optional Market Date | No | A trading date in the format of YYYY-MM-DD.
This is optional and by default the last trading date.
 |
| `expiry` | Single expiry date | Yes | A single expiry date in ISO date format. |
| `timeframe` | Time frame | No | The timeframe of the data to return.
Can be one of the following formats:
- YTD
- 1D, 2D, etc.
- 1W, 2W, etc.
- 1M, 2M, etc.
- 1Y, 2Y, etc.
 |
| `delta` | Delta | Yes | The delta of the option trade. |


## Response (200)

| Field | Type | Description |
|-------|------|-------------|
| `date` | General ISO Date | An ISO date. |
| `delta` | Risk Reversal Delta |  |
| `risk_reversal` | Risk Reversal | The difference between the iv of a put and a call with similar absolute deltas. |
| `ticker` | Stock Ticker | The stock ticker. |


## Example

### curl

```bash
curl -X GET "https://api.unusualwhales.com/api/stock/{ticker}/historical-risk-reversal-skew?expiry=VALUE&delta=VALUE" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json"
```

### Python

```python
import http.client

conn = http.client.HTTPSConnection("api.unusualwhales.com")
headers = {"Authorization": "Bearer YOUR_API_KEY", "Accept": "application/json"}
conn.request("GET", "/api/stock/{ticker}/historical-risk-reversal-skew?expiry=VALUE&delta=VALUE", headers=headers)
response = conn.getresponse()
print(response.read().decode("utf-8"))
```

## Response Example

```json
{
  "data": [
    {
      "date": "2024-01-01",
      "delta": 10,
      "risk_reversal": "0.014",
      "ticker": "SPY"
    },
    {
      "date": "2024-01-02",
      "delta": 10,
      "risk_reversal": "0.009",
      "ticker": "SPY"
    }
  ]
}
```