Bitcoin Options Expiry: $18B Settles Friday With a Call Heavy Book and Max Pain at $75,000

Bitcoin options worth $15.9 billion settle on Deribit at 08:00 UTC on Friday September 25, alongside $2.1 billion in ether contracts, for a combined notional near $18 billion. That single settlement clears 37% of Deribit's $43.5 billion bitcoin options open interest, according to CoinDesk. The book is call heavy, the put to call ratio sits at 0.69, and the max pain level is $75,000 while spot trades nearly ten thousand dollars above it. For anyone reading orderflow rather than headlines, the number that matters is not the notional. It is what happens to dealer hedges the moment those contracts stop existing.

What Settles at 08:00 UTC on September 25

Deribit CEO Luuk Strijers told CoinDesk that "this Friday's quarterly expiry Sept. 25 is one of the largest of the year on Deribit" and that "the September contract remains call-heavy." Roughly a third of the book is in the money. Within the call side specifically, 55% of $9.4 billion sits in the money, per the same CoinDesk figures.

Strike concentration is where the structure lives. Deribit Chief Commercial Officer Jean-David Pequignot said open interest "is heavily concentrated at the $85k, $90k, $95k, and $100k call strikes." The single largest concentration in the whole book, though, is the $70,000 strike, a leftover from a quarter that opened far lower.

Compare that to the same book ten days earlier. On September 15, when bitcoin traded near $78,000, crypto.news reported the September quarterly at $14.73 billion across 186,000 bitcoin contracts with a put to call ratio of 0.52 and max pain at $72,000. Ten days later the notional is up roughly a billion, the ratio has moved from 0.52 to 0.69, and max pain has climbed from $72,000 to $75,000.

That drift tells you something concrete. Puts were added faster than calls into the rally, and the strike distribution recentered upward. Traders did not simply ride the move. They bought downside against it.

Why the Call Heavy Book Pushed Spot Up Rather Than Capping It

The intuitive read on a call heavy book is that it caps price. Sellers of those calls have every reason to keep spot below the strikes. The mechanical read is the opposite, and Strijers stated it directly: "As Bitcoin moved through the $80k-$87k area, dealer hedging of short call exposure likely contributed to the upward move."

The mechanism is short gamma. A desk short a $85,000 call gets progressively shorter delta as spot rises toward that strike, so it has to buy spot or futures to stay neutral. That buying is not discretionary and it is not sentiment. It is a hedge ratio updating, and it arrives as market orders into whatever depth exists.

This is why a rally into a heavily sold call strike often looks stronger in the tape than the underlying flow justifies. The aggressive buying is real, it prints in cumulative volume delta, and it is genuinely price insensitive. It is also finite, and it stops existing when the option does.

Max Pain at $75,000 Is Not a Price Target

Max pain is the strike that would expire the largest notional worthless. It is an accounting outcome, not a gravitational field, and treating it as a destination is one of the more reliable ways to lose money around an expiry.

With spot between $84,394 and $85,500 in CoinDesk's snapshot and max pain at $75,000, the gap is close to 12%. No plausible dealer hedging flow drags spot that far in two sessions against the underlying trend. What max pain does tell you is that a large slice of the book is set to die worthless, which means the hedges backing it get unwound rather than settled into.

The useful question is directional: are dealers net short or net long gamma at the strikes near spot, and does unwinding release buying or selling? With the concentration sitting at $85,000 and $90,000 calls and spot pressed against the lower of the two, the hedge that supported the move up is the hedge that disappears Friday morning.

The Perp Book After the Options Anchor Lifts

Positioning data compiled by Coinpedia, citing DeFi strategist Penguin X, describes a range held between $85,000 and $88,000, with roughly $142 million of buying interest for each 1% dip toward $85,000 and around $103 million of seller positioning at $88,000 rising to $123 million at $90,000. The same analysis argues that "once that expiry hits, the wall currently holding price near $85,000 disappears, removing the anchor that's been keeping Bitcoin range-bound."

Treat those figures as one desk's reading of resting interest rather than settled fact. The structural point stands regardless of the exact dollar amounts: a range maintained partly by option hedging is a range with an expiry date on it.

The macro backdrop is not helping the bid. KuCoin's September 24 market report had bitcoin at $84,063, down 2.55%, and ether at $2,675, down 2.76%, after a stronger than expected PMI print lifted rate hike bets and sent Treasury yields higher. Bitcoin retreated from a $87,000 high, found support at $83,600 to $83,800, and rebounded only to $84,400 with subdued momentum.

So Friday arrives with spot pinned near the largest near term call strike, weakening macro, and the single largest hedging flow of the quarter about to be retired. That combination usually resolves as an expansion in realized volatility rather than a clean direction.

What to Watch in the Hours After Settlement

Watch perpetual open interest across the settlement window, not just price. If open interest rises while price chops, positioning is being rebuilt rather than closed, and the next move has fuel behind it. If open interest falls with price, the move is deleveraging and tends to exhaust faster than it looks.

Watch funding in the first eight hours after 08:00 UTC. Funding that flips negative while spot holds above $84,000 means shorts are paying to be positioned for a break that has not happened, which is the setup that produces squeezes rather than trends.

Watch where liquidation density sits relative to $85,000 and $83,600. Once option hedging stops absorbing flow, the resting stops and liquidation clusters become the dominant source of forced orders, and they fill in the direction that hurts most.

The Buildix screener tracks open interest, funding, and cumulative volume delta across Hyperliquid pairs in one view, and the liquidation map shows where the forced sellers and buyers actually sit rather than where sentiment says they should. That is the difference between knowing $18 billion expires and knowing which side gets run first.

An expiry does not create direction. It removes the flow that was suppressing it, and then the perp book decides. The book going into Friday is call heavy, spot is sitting on the busiest strike, and the macro bid is thinner than it was a week ago. Position for a wider range, not a chosen side.