---
title: "25 Delta Skew Normalized (1 Month)"
method: GET
path: "/v1/metrics/derivatives/options_25delta_skew_1_month"
---

# 25 Delta Skew Normalized (1 Month)

`GET /v1/metrics/derivatives/options_25delta_skew_1_month`

**Definition.** 25 Delta Skew Normalized (1 Month) is the relative richness of put versus call implied volatility on options expiring in roughly one month, computed as the difference between a 25-delta put's implied volatility and a 25-delta call's implied volatility, normalized by the at-the-money implied volatility.\n\n**Technical.** A 25-delta put has a delta of -25, sampling the option surface at symmetric points either side of the money to expose the put-versus-call asymmetry in implied volatility.\n\n**Interpretation.** Positive readings mean puts are richer than equivalent-delta calls, negative readings mean calls are richer than puts.\n

[View in Studio](https://studio.glassnode.com/charts/derivatives.Options25DeltaSkew1Month?a=BTC)

## Query parameters

- `a` string, required
- `s` integer
- `u` integer
- `i` string
- `f` 'csv' | 'json'
- `e` string, required
- `timestamp_format` 'unix' | 'humanized'

## Response `200`

Successful response

- TimeSeriesDataPoint[]
  - `t` integer — Unix timestamp
  - `v` union — Metric value (can be number, object, or array depending on the metric)
    - number
    - object
  - `o` object — Object containing multiple metric values (when applicable)

## Other responses

- `400` — Bad Request - Invalid parameters or unsupported asset
- `401` — Unauthorized - Invalid or missing API key
- `429` — Too Many Requests - Rate limit exceeded

---

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