What is the Put/Call Ratio (PCR)?
The put/call ratio (PCR) divides put activity by call activity to gauge the sentiment embedded in option flow. A PCR above 1 means puts dominate — defensive or bearish positioning. A PCR below 1 means calls dominate — bullish or speculative positioning. On Deribit's BTC and ETH options the structural baseline is well below 1, so any move above 0.9 deserves attention.
How PCR Is Calculated
The ratio can be built from either volume or open interest, each answering a different question:
Volume PCR captures flow: it answers “what did traders do today?”. Open-interest PCR captures inventory: it answers “what positioning is currently on the book?”. CryptoGamma displays both on the dashboard. Sharp divergences between them — for example volume PCR spiking while OI PCR is steady — usually signal fresh hedging demand rather than a shift in structural positioning.
Interpreting PCR Ranges for BTC and ETH
Typical Deribit Ranges (Open Interest)
- PCR < 0.4: Euphoric call bias. Often coincides with leveraged FOMO phases and over-extended uptrends.
- PCR 0.4–0.7: Normal bullish regime. Baseline for BTC over most of the 2023–2024 sample.
- PCR 0.7–1.0: Elevated defensive positioning. Often follows a drawdown or precedes a risk-off phase.
- PCR > 1.0: Rare on Deribit. Historically coincides with capitulation events or major macro shocks. Often marks contrarian buying zones.
Why PCR Matters for Crypto
- Sentiment thermometer. PCR turns dispersed option flow into a single scalar that is easy to compare across time.
- Regime detection. A secular shift from 0.5 to 0.8 on OI PCR is a meaningful positioning change, even if spot is flat.
- Contrarian extremes. Because crypto PCR baselines sit below 1, any reading near or above 1 is historically rare and often reversal-worthy.
- Cross-checks. PCR complements Gamma Exposure and 25-delta skew: divergence between PCR and skew often precedes short-term reversion.
Limitations and Caveats
- PCR ignores strike distance and tenor: a 10-delta put and an ATM put count equally.
- Single large block trades can spike volume PCR without meaningful sentiment shift.
- Roll weeks (near monthly expiries) distort open-interest PCR.
- Cross-asset PCR comparisons require normalisation to each market's own historical range.
Frequently Asked Questions
What is a put/call ratio and how do I interpret it?
The put/call ratio (PCR) is the total put activity divided by the total call activity over a chosen window. A PCR above 1 means more puts than calls are active, signalling defensive or bearish positioning. A PCR below 1 means more calls than puts, signalling bullish or speculative positioning. Extreme readings in either direction are often treated as contrarian signals.
What is a "normal" put/call ratio for Bitcoin options?
On Deribit, BTC options have historically run a PCR (by open interest) in the 0.4 to 0.9 range, with a median closer to 0.6. That is structurally lower than S&P 500 options because crypto call demand is driven by levered upside bets rather than portfolio hedging. A BTC PCR above 1 is rare and often coincides with major drawdowns.
Why is crypto PCR structurally lower than equities?
In equities, institutional portfolios routinely buy puts as insurance against long stock positions, which pushes the PCR toward or above 1. Crypto option flow is dominated by leveraged directional bets and yield-enhancement strategies (covered calls, cash-secured puts), both of which skew open interest toward calls. That gives BTC and ETH a baseline PCR well below the S&P 500.
How do I use PCR for BTC/ETH trading?
Use PCR in combination with price trend and implied volatility. A rising PCR alongside falling prices is a classic fear signal that can precede capitulation lows. A falling PCR alongside rising prices often marks euphoric tops. Avoid using a single PCR reading as a standalone entry trigger — combine it with gamma exposure, skew, and realised-vs-implied volatility.
What's the difference between volume PCR and open interest PCR?
Volume PCR is computed over a rolling window (typically the most recent 24 hours or one trading day) and measures flow. Open-interest PCR is a snapshot of the current outstanding contracts and measures inventory. Volume PCR reacts faster to intraday regime shifts; OI PCR is steadier and better for medium-term positioning assessments. CryptoGamma surfaces both on the dashboard.
Is a rising put/call ratio bullish or bearish?
Mechanically, a rising PCR reflects growing put demand, which is bearish sentiment. Interpretively, once PCR reaches historically extreme levels, many traders read it as a contrarian bullish signal because it implies the marginal hedger has already bought protection. The distinction matters: trend-following traders fade rising PCR only at extremes, while sentiment traders treat any PCR above 1 as a caution flag.
How is CBOE PCR different from Deribit PCR?
The CBOE equity PCR covers listed US equity and index options and typically sits between 0.7 and 1.2. The Deribit BTC and ETH PCR covers crypto options only and typically runs lower (around 0.4 to 0.9 on open interest) because of the structural call bias in crypto. Cross-asset comparisons are only meaningful if you normalise to each market's own historical range.
Can PCR be used as a standalone signal?
Generally no. PCR is most reliable as a confirming indicator alongside gamma exposure, skew, and spot-return momentum. On Deribit specifically, PCR can be distorted by single block trades from institutional desks or by large expiries rolling off; always cross-check with volume-weighted flow and 25-delta skew before acting on a PCR reading alone.
See Live PCR for BTC and ETH
CryptoGamma shows live volume PCR and open-interest PCR computed from Deribit feeds, alongside Gamma Exposure, 25-delta skew, and max pain.
View Live Dashboard