The Deribit open interest Bitcoin and Ether market is approaching one of its most important quarterly settlements of 2026, with nearly $18 billion in cryptocurrency options scheduled to expire on Friday, 25 September.
Around $15.9 billion in Bitcoin options are due to settle on Deribit at 08:00 UTC, or 09:00 BST, alongside approximately $2.1 billion in Ether options.
The size of the Bitcoin expiry makes the event particularly significant. The contracts expiring on Friday represent roughly 37% of Deribit’s reported Bitcoin options open interest of about $43.5 billion, meaning a substantial part of the exchange’s outstanding BTC derivatives exposure will disappear or be rolled into later expiries in a single settlement.
The positioning behind those contracts is also attracting attention.
Bitcoin call open interest ahead of the expiry is estimated at between $9.4 billion and $9.6 billion, compared with approximately $6.4 billion to $6.5 billion in puts. That leaves the put-to-call open interest ratio around 0.69 to 0.71.
In simple terms, there are roughly 1.4 call contracts for every put contract in the expiry book.
Deribit CEO Luuk Strijers has described the September settlement as particularly “call-heavy”, placing it among the exchange’s biggest options expiries of the year.
| Deribit September 25 Expiry | Approximate Figure |
| Bitcoin options expiring | $15.9 billion |
| Ether options expiring | $2.1 billion |
| Total BTC open interest | $43.5 billion |
| BTC call open interest | $9.4bn–$9.6bn |
| BTC put open interest | $6.4bn–$6.5bn |
| Put/call ratio | 0.69–0.71 |
| Bitcoin max pain | $75,000 |
| Settlement time | 08:00 UTC |
Bitcoin has recently been trading in the mid-$80,000 range, well above the $75,000 level identified as maximum pain for the September expiry.
That gap is one of the most important parts of the current Deribit open interest picture.
Why Bitcoin Trading Above $75,000 Matters?
The $75,000 max pain level represents the approximate strike area where the greatest value of outstanding options would expire worthless, resulting in the lowest aggregate payout to option holders.
Bitcoin has instead been trading more than $10,000 above that point.
Because of the rally into the mid-$80,000 range, roughly one-third of the Bitcoin options included in the expiry have moved into the money, with much of the valuable exposure concentrated on the call side.
Open interest is particularly notable around call strikes between roughly $85,000 and $100,000.
This creates an unusual situation heading into settlement. Bitcoin is not sitting close to maximum pain. It has moved significantly above it, putting many previously speculative upside contracts within reach or already in the money.
The difference could help explain why Friday’s settlement is being watched closely by derivatives desks.
Market makers that sell options frequently manage their directional exposure through delta hedging. If Bitcoin rises towards heavily populated call strikes, dealers may need to alter their Bitcoin, futures or other hedging positions as option deltas change.
Those flows can sometimes amplify short-term movements around major strikes.
Once the options expire, however, some of those hedges may no longer be required.
That means the market is not only watching what happens immediately before the settlement. The period after 08:00 UTC could be equally important as dealers unwind, rebalance or roll positions into October, December and other maturities.
This increasingly interconnected relationship between spot Bitcoin, futures, options and collateral markets is also part of the wider growth in Bitcoin institutional finance, where trading firms can manage exposure across several different crypto instruments rather than simply buying or selling BTC directly.
Does the 0.69 Put-to-Call Ratio Mean Traders Are Bullish?
A put-to-call open interest ratio below 1 generally means there are more calls outstanding than puts.
With the ratio around 0.69 to 0.71, Deribit’s September Bitcoin book clearly contains substantially more call open interest.
That reflects an upside-heavy options structure built during the quarter, but the figure should not automatically be interpreted as every trader expecting Bitcoin to rise.
Options are frequently used in:
- Call spreads
- Covered-call strategies
- Volatility trades
- Market-maker hedges
- Multi-leg strategies
- Portfolio protection
- Relative-value trades
A large call position can therefore form one side of a more complicated strategy rather than representing a simple leveraged bet that Bitcoin will rise.
The ratio is still useful because it reveals the overall structure of the options book. What it does not reveal on its own is the exact directional exposure of every participant.
The same caution applies to max pain.
Bitcoin does not have to fall towards $75,000 simply because that is the estimated max pain level. Max pain describes the payout structure of outstanding options; it is not a guaranteed Bitcoin price target.
If BTC remains firmly above $75,000 through settlement, it would weaken the idea that expiry mechanics alone can pull the market towards that strike.
Bitcoin Faces More Than a Deribit Expiry on September 25
The timing makes this quarterly expiry more interesting than an isolated crypto derivatives settlement.
The Deribit options expiration coincides with CME Bitcoin futures settlement and important US economic data, including durable goods orders.
Multiple market-moving events landing within the same trading session can create additional volatility because crypto traders, macro investors, futures desks and options dealers may all be adjusting positions at similar times.
The concentration of derivatives exposure is particularly important because the $15.9 billion BTC expiry represents around 37% of total Deribit Bitcoin options open interest.
A settlement that removes more than a third of outstanding open interest can materially change the positioning landscape.
Rather than focusing only on whether Bitcoin rises or falls immediately before expiry, traders may therefore watch what happens to open interest afterwards.
A large reduction would be expected as the contracts settle, but the more revealing question is how much exposure is subsequently rebuilt through later-dated contracts.
If traders rapidly establish new call positions at higher strikes, that would show that demand for upside exposure has continued beyond the quarterly expiry.
If open interest rebuilds through puts, downside hedges or more neutral option structures, the market could instead be signalling greater caution for the fourth quarter.
This is also why experienced traders often compare derivatives venues and other crypto exchanges with futures and advanced trading tools rather than analysing spot-market activity alone.
Ether Adds Another $2.1 Billion to the Expiry
Bitcoin accounts for most of the attention, but Ether introduces another layer of derivatives exposure.
Approximately $2.1 billion in ETH options are scheduled to expire alongside Bitcoin.
That takes the combined BTC and ETH settlement towards $18 billion, making the event relevant beyond Bitcoin alone.
Ether’s expiry is considerably smaller than Bitcoin’s, but ETH remains deeply connected to broader crypto risk sentiment. Large positioning changes in Bitcoin frequently influence Ether, while simultaneous options expiries can increase the amount of dealer hedging and portfolio rebalancing occurring across the market.
Traders will therefore be watching whether ETH volatility increases around the settlement even if the initial catalyst comes from Bitcoin.
The expiry could become especially important if Bitcoin moves sharply through a heavily populated strike shortly before settlement. Correlated movements across BTC and ETH could force market participants to adjust hedges across both assets at the same time.
For the wider crypto market, that means Deribit open interest in Bitcoin and Ether is not simply a statistic about outstanding contracts. At this scale, it provides a snapshot of where billions of dollars of derivatives exposure are concentrated and how that positioning could interact with the underlying market.
The key level remains clear heading towards settlement: Bitcoin’s $75,000 max pain sits significantly below the recent mid-$80,000 trading range.
If Bitcoin continues holding comfortably above that zone as the $15.9 billion expiry clears, attention is likely to shift from the expiry itself to what traders do next particularly whether fresh open interest rebuilds around $90,000, $95,000 and $100,000 calls or whether the fourth-quarter options market becomes more defensive.
With nearly $18 billion in Bitcoin and Ether contracts disappearing from the September book at the same time, that post-expiry positioning may ultimately provide a more useful signal than the settlement price itself.
