BTC Options Expiry (OpEx) Explained: How to Trade It

BTC options expiry, almost universally called OpEx, is the moment every Friday at 08:00 UTC when a batch of Bitcoin options settles. It is the single largest recurring liquidity event in crypto options. Whether you trade options or not, OpEx affects spot, perps, and funding through dealer hedging flows that build all week and resolve in a few hours.

This guide covers when OpEx happens, the mechanics on Deribit, why it moves price, the difference between weekly, monthly, and quarterly expiries, and the playbook traders use around it.

When BTC OpEx happens

Standard Bitcoin options on Deribit settle every Friday at 08:00 UTC. The expiry calendar is layered:

• Weeklies. A new weekly is listed every Friday and expires the following Friday. Daily and shorter durations also exist but carry less open interest.
• Monthlies. The last Friday of every month is the monthly expiry. Monthlies absorb significant open interest in the days leading up to settlement as customers roll positions or close out for the month.
• Quarterlies. The last Friday of March, June, September, and December. These are the largest expiries of the year and the dominant anchor of the entire term structure.

Settlement on Deribit uses the time-weighted average of the Deribit Bitcoin Index over the half hour prior to 08:00 UTC. That window is where the most concentrated hedging activity occurs and where pinning, when it happens, is finalized.

Why OpEx matters

The mechanical reason OpEx matters is dealer hedging. Market makers are typically short the options that customers hold. They stay delta-neutral by trading the underlying, and as expiry approaches the gamma of near-the-money strikes spikes. That spike forces dealers to hedge more aggressively. The flow shows up in spot and perps, often more than enough to push price several percent in either direction within hours.

The behavioural reason OpEx matters is that OpEx is a Schelling point. Every options-aware trader watches it. Liquidity concentrates around it. Discretionary traders position for it. That concentration is self-reinforcing.

OpEx is the only event in crypto markets that is both perfectly scheduled and large enough to dominate price action. Macro events are bigger but irregular. Daily flows are regular but smaller. OpEx is both.

Reading the OpEx setup

Three pieces of information define how a given Friday will play out: the gamma regime, the max pain level, and the open-interest distribution.

1. Gamma regime

If dealers are net long gamma at the time of OpEx, their hedging damps price and pulls it toward the largest strikes. Expect range-bound action and pinning. If dealers are net short gamma, their hedging amplifies moves. Expect volatility expansion and potentially one-directional flushes. The single most important data point heading into Friday is which side of the gamma flip spot is on.

2. Max pain

Max pain is the strike at which option buyers collectively lose the most. In a positive-gamma regime, max pain acts as a magnet, often hit within the last two to four hours before settlement. In a negative-gamma regime, max pain is informational only and price often closes far from it.

3. Open-interest distribution

How is OI clustered? A book with most OI piled at two adjacent strikes near spot has a strong magnet. A book spread evenly across twenty strikes has a weak magnet. The shape of the OI distribution determines how concentrated dealer hedging will be.

The weekly OpEx playbook

1. Wednesday: regime check. Look at gamma exposure and the flip line. If spot is comfortably above the flip with a clear call wall above, the bias is for a drift higher into expiry. If spot is below the flip, prepare for expansion.
2. Thursday: position sizing. Mark max pain and the dominant walls. In positive gamma, mean-reversion trades toward max pain are highest probability. In negative gamma, breakout setups carry better odds.
3. Friday Asian session: the pin window. The hours from 04:00 to 08:00 UTC are where pinning, when it happens, finalizes. Volume thins, dealer hedging concentrates, and price often grinds toward the strike with the highest OI.
4. 08:00 UTC: settlement. Options settle. The hedging flow that was holding price in place disappears.
5. Post-08:00: the release. The hours immediately after expiry are statistically the most volatile of the week. Pent-up directional pressure resolves quickly. If price was pinned all night, the post-OpEx move is often cleaner than any move during the week.

Monthly and quarterly OpEx

Monthly and quarterly expiries carry the same mechanics with larger flows and longer time horizons.

Monthly OpEx

The last Friday of each month sees customer roll activity that starts as early as Tuesday or Wednesday. Long calendar spreads close, vega is rolled forward, and front-month gamma rolls into the next monthly. The hedging flow is broader and starts earlier, but the settlement mechanic is the same. A month-end OpEx in a positive-gamma regime can produce two to three days of pinning instead of just one.

Quarterly OpEx

Quarterly expiries are the dominant events of the year. Open interest on a quarterly can exceed the sum of every weekly that follows it. Hedging flows can dominate price action for a full week before and after settlement. Quarterly max pain often acts as a magnet for ten to fifteen days, and the post-quarterly release frequently sets the tone for the entire next quarter.

If you trade BTC and only have time to pay attention to one options event per quarter, this is it. The last Friday of March, June, September, and December carry more positioning information than any other day of the trading calendar.

Volatility behavior into and out of OpEx

Implied volatility on the front-week option does not behave symmetrically. Three patterns recur.

• The pre-expiry crush. Front-week IV decays rapidly through Thursday and into Friday. Theta is the dominant force on a short-dated option in its final 48 hours, and that decay accelerates if realized vol is low.
• The pin-induced compression. When the OpEx setup favors pinning, realized vol collapses on Thursday night and Friday morning. Implied vol on the next weekly often gets sold against this compression, sometimes aggressively.
• The post-expiry repricing. Once options settle, IV on the new front-week often gets re-bid as the market re-prices the next week of risk. Skew can reset meaningfully between Friday 08:00 and the Asian session that follows.

Common OpEx misconceptions

“OpEx always pins.” Pinning is a positive-gamma phenomenon. In negative-gamma regimes price often runs away from max pain into expiry. Always read the gamma regime before assuming the pin.

“OpEx is manipulation.” It is not. Pinning is the mechanical output of dealer hedging on public open-interest data. There is no coordinated action and no single party benefits.

“Daily expiries matter as much as weekly.” They do not. Daily and shorter expiries on Deribit carry small open interest and produce localized flows that do not move price meaningfully. The Friday 08:00 UTC weekly is the smallest expiry that produces tradable hedging flow.

“OpEx only matters if you trade options.” Spot and perp traders are exposed to OpEx flows whether they trade options or not. The hedging happens in spot. Funding shifts. Liquidity rotates. Ignoring OpEx as a spot trader is ignoring one of the largest scheduled flows of the week.

Frequently asked questions