Options Skew: Reading Put-Call Imbalances in Crypto Options Markets

What Options Skew Measures

Options skew is a measure of the relative implied volatility (IV) of different strikes. In a "symmetric" market, calls and puts at equivalent distance from the current price would price at similar IV. In practice, they rarely do. The difference is the skew.

The most common crypto skew metric is 25-delta risk reversal:

25-Delta Skew = IV of 25-Delta Call - IV of 25-Delta Put

25-delta options are approximately 25% likely to finish in the money. They represent meaningful but not extreme OTM exposure. A 25-delta put on BTC at $100k might have strike around $90k; a 25-delta call, strike around $110k.

• Positive skew: calls have higher IV than puts. Market is pricing more worry about upside vol than downside. Greed premium.
• Negative skew: puts have higher IV than calls. Market is pricing more worry about downside. Fear premium.

Crypto skew is typically positive (calls more expensive than puts) because crypto's convexity goes to the upside. This differs from equities, where skew is typically negative because equity risk-off dynamics are more extreme than risk-on.

How to Read Skew

Extreme Put Skew (Negative Risk Reversal)

When puts become significantly more expensive than calls, traders are paying heavy premium for downside protection. This typically coincides with:

• Recent sharp drawdowns
• Macro stress events
• Cycle bottom formations

Extreme put skew is a fear signal. Buying into markets with extreme negative skew has historically been profitable at cycle-bottom timeframes.

Extreme Call Skew (Positive Risk Reversal)

Calls becoming significantly more expensive than puts signals speculative excess. Traders are paying premium for upside bets rather than downside protection. Coincides with:

• Late-cycle bull markets
• Narrative-driven rallies
• FOMO episodes

Extreme positive skew is a greed signal. Selling into markets with extreme positive skew has historically been better than buying at those moments.

Regime Shifts

The most actionable skew signal is often a regime shift rather than an extreme level. When skew pivots from persistent negative to positive (fear giving way to greed), bull markets often start. When skew pivots from positive to negative (greed giving way to fear), markets often top.

Crypto Options Market Structure

Most published skew metrics come from Deribit. Deribit dominates crypto options: BTC options, ETH options, and increasingly SOL options. Its options volume typically exceeds 80-90% of the crypto options market.

CME options provide complementary signal to Deribit because institutional positioning on CME differs from crypto-native positioning on Deribit. Skew divergences between the two venues can flag professional-vs-retail disagreements.

Skew in Cycle Context

Tracking skew evolution through a cycle reveals regime. Early bulls often show modest positive skew growing over time. Late bulls show extreme positive skew. Early bears show skew flipping to negative. Deep bears show persistent put premium.

Limitations

• Low OI distortion: skew calculations depend on liquid options markets. For illiquid strikes, skew readings can be noisy.
• Event-driven spikes: scheduled events (FOMC, CPI releases, ETF decisions) can spike skew short-term without reflecting persistent sentiment.
• Term structure complexity: skew at 7 days may differ from skew at 90 days. Picking the right tenor matters.
• Exchange-specific: Deribit skew may differ from CME skew; both may differ from aggregate sentiment.

Using Skew for Trading

Entry Timing

Extreme negative skew (fear) historically provides better long-entry regimes than neutral or positive skew. Combining with other signals (oversold RSI, capitulation metrics) produces stronger entries.

Exit Timing

Extreme positive skew (greed) historically provides better short-entry or exit regimes than neutral or negative skew. Combining with distribution signals and cycle-top metrics produces stronger exits.

Volatility Strategies

Skew itself is tradeable. Selling risk reversals when skew is extreme (selling the expensive side, buying the cheap side) is a professional options strategy that profits from skew normalization.

Sentiment Confirmation

At any market moment, check whether current skew aligns with or contradicts your thesis. If you're bullish and skew is already extremely positive (call premium), you're positioning with the crowd. If you're bullish and skew is negative, you're contrarian.