Crypto options glossary
What is the put-call ratio in Bitcoin options?
The put-call ratio (PCR) divides the open interest in puts by the open interest in calls. Above 1, more puts are open than calls; below 1, more calls. Traders read it as a sentiment gauge: a very high PCR shows heavy hedging or fear, a very low one heavy call buying or optimism.
- PCR = put open interest ÷ call open interest.
- Above 1: more puts open. Below 1: more calls open.
- Extremes are read as sentiment; some traders take them as contrarian.
- Algoclear works it out per expiry from Delta Exchange open interest.
Today's expiry
0.46
More calls open than puts
Weekly · Fri 25 Sep
4.58
More puts open than calls
Puts 31%Calls 69%
Put open interest divided by call open interest, across every strike of the expiry, from Delta Exchange.
Questions people ask
Is a high put-call ratio bearish?
Not necessarily. Puts are also bought as insurance by people who hold Bitcoin, so a high ratio can mean heavy hedging rather than a bet on a fall. Some traders read extremes as contrarian: when everyone is hedged, the fall may already be priced.
What is a normal PCR for Bitcoin?
There is no fixed normal. Compare today's value with its own recent range rather than with a textbook number.
PCR by volume or by open interest?
Both exist. Algoclear uses open interest, which counts positions that are still open rather than one day's trading.
What does a put-call ratio above 1 mean?
More put contracts are open than call contracts for that expiry. It shows that protection or downside positions outnumber upside ones; it does not by itself mean traders expect a fall.
Is the put-call ratio a good indicator on its own?
No. It describes what kind of options are open, not who is right. It is most useful at extremes, watched over time, and read beside the OI walls, max pain and the expected move.
How often does Algoclear update the ratio?
Every five minutes, from Delta Exchange open interest, separately for the nearest expiry and for the weekly.
The put-call ratio, worked in numbers
An example with round numbers. For one expiry, 1,500 put contracts and 1,000 call contracts are open. The put-call ratio is 1,500 ÷ 1,000 = 1.50.
Another way to see it: of all the open contracts, 60% are puts and 40% are calls. A ratio of 1.00 is an even split; 0.50 means calls outnumber puts two to one.
How Algoclear labels the ratio
Market now turns the number into one of three plain labels.
| Put-call ratio | Label | What is open |
|---|---|---|
| Above 1.2 | Put-heavy | Clearly more puts than calls |
| 0.8 to 1.2 | Balanced | About as many of each |
| Below 0.8 | Call-heavy | Clearly more calls than puts |
The labels describe positioning. They do not say whether Bitcoin will rise or fall.
Why the weekly ratio is often much higher than the daily
On the same afternoon, Bitcoin's daily expiry can show a ratio near 1.7 while the weekly shows 5 or more. Nothing is broken. Weekly and monthly chains carry large blocks of far out-of-the-money puts, bought as cheap protection against a crash, and those swell the put side of the ratio.
So compare like with like: today's daily ratio with recent dailies, this weekly with recent weeklies. A number that is normal for one would be an extreme for the other.
How traders use the ratio
As background to other levels.
- Watching the change. A ratio rising while Bitcoin falls shows protection being bought; one falling while Bitcoin rises shows calls chasing the move.
- As a contrarian hint at extremes: when nearly everyone is hedged, much of the fear may already be in the price.
- Beside funding: leveraged longs paying high funding while the options market is put-heavy is a market hedging its own optimism.
- With the walls and max pain, which say where the positions are; the ratio only says which kind.
Reading the ratio
A single PCR number says little. How it changes says more: a ratio climbing while Bitcoin falls shows demand for protection; a ratio falling while Bitcoin rises shows calls chasing the move.
PCR with the walls and max pain
The ratio says which way the option book leans; the OI walls say where. Read together, they show whether positioning supports a range or leans one way. Algoclear's Market now shows all three for Bitcoin.
Common mistakes with the put-call ratio
It looks like a sentiment dial, which is the trap.
- Reading a high ratio as bearish. Puts are bought by people who own Bitcoin and want insurance, which is not a bet on a fall.
- Forgetting that every put was also sold by someone, often a trader who expects the price to hold.
- Comparing a weekly ratio with a daily one.
- Acting on a single reading rather than on how it has changed.
Written by the Algoclear team · Updated 22 September 2026 · Examples use Bitcoin options on Delta Exchange India.
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