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DERIVATIVES · CHARM EXPOSURE

Crypto Options Charm Exposure: How to Read the Data With Price Context

Charm measures how an option's delta changes with the passage of time. Aggregated, it estimates hedging adjustments that happen just because expiry gets closer.

By ChartsPod Editorial Team · Reviewed by ChartsPod Research
Published · Updated · 5 min read

Short answer

Charm (delta decay) is the rate at which delta changes as time passes. Charm exposure aggregates it using OI and a positioning assumption to estimate the hedge adjustments driven by time alone, which grow into expiry, especially for near-the-money options. In quiet markets these adjustments can show up as steady drift; around large expiries they can matter more. Read it with time to expiry and price distance from large strikes.

Time effect

SituationCharm effect
Far from expirySmall
Days before expiryGrows
Near-the-moneyLargest
After expiryResets

Exposure figures need an assumption about who holds each option (commonly: dealers are short what customers bought). Public open interest doesn't reveal positions, so treat dealer-exposure numbers as model outputs.

Price context

Illustrative charm-driven delta change per day (BTC)Illustrative charm-driven delta change per day (BTC): 14 days out 12 BTC; 7 days out 31 BTC; 2 days out 88 BTC.ILLUSTRATIVE CHARM-DRIVEN DELTA CHANGE PER DAY (BTC)14 days out12 BTC7 days out31 BTC2 days out88 BTC
Time effects accelerate near expiry. Original ChartsPod editorial graphic.
Reading charmReading charm: Days to expiry; Distance to large strikes; Assumption stated; Weekend effect; Snapshot time.READING CHARMDays to expiryDistance to large strikesAssumption statedWeekend effectSnapshot time
Time, not price, drives it. Original ChartsPod editorial graphic.

Using it

Related: Crypto Options Vanna Exposure: How to Read the Data With Price Context, Options Expiry Concentration in Crypto: How to Read the Data With Price Context.

Check charm exposure beside price in ChartsPod.

Open BTC/USDT in ChartsPod

Read it with time to expiry and price distance from large strikes.

Review Crypto Options Charm Exposure with bar replay before using it live.

Open ChartsPod replay

Questions readers ask

What is charm?

Delta's sensitivity to time.

When does it matter most?

Close to expiry, near the money.

Is it observable?

Modelled from OI and Greeks.

Sources and methodology

Definitions follow Binance's USD-M market data documentation, Hyperliquid's funding documentation, TradingView's open-interest guide and Bybit's liquidation rules, read 17 October 2026. Examples are illustrative, not recorded market data.

  1. Deribit Insights: Genesis Volatility options data guide — skew, smile, term structure.
  2. Deribit API: ticker — greeks: delta, gamma, vega, theta, rho; bid/ask/mark IV.
  3. ChartsPod: product overview, pricing and FAQ — free terminal, venues, modules, no order placement; checked 17 Oct 2026.

This article explains research tools and workflows. It is not financial advice, does not recommend buying or selling any asset and does not predict prices. Crypto derivatives carry a risk of rapid and total loss of margin.

CHARTSPOD EDITORIAL EDITION · RESEARCH AND EDUCATION ONLY · NOT FINANCIAL ADVICE.