0DTE Options Explained: Same-Day Expiry Mechanics for Crypto Traders

0DTE stands for “zero days to expiration” — an option that expires on the same day it is being traded. 0DTE options have the highest gamma on the chain, the steepest theta decay, and the most concentrated dealer hedging flows of any instrument in the market. They are also one of the most misunderstood corners of crypto options. This guide covers what they are, how they work in crypto specifically, and what they mean for spot price.

Crypto traders have been using 0DTE options on Deribit for years. The product has grown alongside the SPX 0DTE boom in equities, and the mechanics carry over with crypto-specific twists: 24/7 markets, weekly cadence, and a single Friday 08:00 UTC settlement that anchors the entire short end.

What 0DTE means

An option contract is defined by its strike, its type (call or put), and its expiry date. When today’s date matches the expiry date, the option is 0DTE. It will settle in hours, not days. Every option becomes 0DTE eventually — the question is whether it began life as a 0DTE (issued on the day it expires) or aged into 0DTE over time.

On Deribit, daily options are listed each morning that expire at 08:00 UTC the same day. Weekly and monthly options also become 0DTE on their final day. The Friday daily and the standard weekly settle simultaneously, producing the most concentrated 0DTE flows of the week.

Why 0DTE is structurally different

Maximum gamma per unit of time

Gamma is the rate at which delta changes. It is largest for at-the-money options near expiry, and 0DTE options sit at the extreme of that distribution. A 0DTE ATM call can have gamma an order of magnitude larger than a same-strike weekly. That concentration is why dealer hedging on 0DTE positions dominates intraday flow.

Maximum theta per unit of time

Theta is also at its peak. The option has only hours to lose all of its time value, so the per-hour decay accelerates throughout the day. By the final two hours before settlement, an ATM 0DTE option can lose 30-40% of its value per hour from theta alone, regardless of spot. This is why 0DTE positions are unforgiving — the move has to happen quickly or the option dies.

Binary outcomes

By definition, a 0DTE option settles to its intrinsic value in hours. There is no time for recovery. Unlike a weekly where a bad day can be redeemed by a good one, a 0DTE day either pays or expires worthless. This binary character is what attracts speculative flow and what makes the instrument risky.

0DTE options compress the entire lifecycle of an option into a single trading session. Everything that takes weeks for a longer-dated option — gamma scaling, theta decay, vol crush — happens in hours. That compression is the source of both the opportunity and the risk.

0DTE in crypto specifically

Crypto 0DTE has features that distinguish it from equity 0DTE.

• 24/7 markets. 0DTE options can be opened or closed at any hour. The Asian session typically sees the most activity in the lead-up to the 08:00 UTC settlement.
• Single daily settlement window. Every Deribit daily expires at 08:00 UTC. There is no intraday cycle of opening rotations and closing auctions like in equities.
• Friday concentration. The Friday daily coincides with the standard weekly. That overlap produces the largest open interest of the week and the most aggressive dealer hedging into the final hours.
• Smaller dealer set. Crypto has fewer large options market makers than SPX. Dealer flows concentrate among a small number of desks, which means positioning shifts can happen quickly.
• Direct effect on perps and spot. Dealer hedging on 0DTE positions shows up in funding, basis, and spot order books. A 0DTE pin or cascade is visible in funding before it is visible on a candle chart.

How 0DTE flows shape spot

Positive gamma — pinning

When dealers are net long gamma on the 0DTE expiry, their hedging is counter-trend: selling rallies, buying dips. As 08:00 UTC approaches, the magnetic pull toward the largest open-interest strike strengthens. Tight pins of two to three hours into settlement are the signature of a positive-gamma 0DTE day.

Negative gamma — cascades

When dealers are net short gamma, hedging is pro-cyclical: buying as price rises, selling as it falls. The same 0DTE concentration that produces pinning in positive gamma now produces amplification. A 0DTE day in negative gamma can see the sharpest, fastest price moves of any session in the week.

The post-08:00 release

Once 0DTE options settle, the gamma concentration that was holding price in place disappears. Pent-up directional pressure that was being absorbed by dealer hedging often resolves in the hour or two after 08:00 UTC. Statistically, the post-OpEx hours on Friday are the most volatile of the week.

How traders use 0DTE

• Tactical event exposure. A trader expecting a same-day catalyst (FOMC, CPI, on-chain settlement) can buy 0DTE options for cheap, high-leverage exposure to the move. The premium is small because most of the option’s value has already decayed.
• Pin trades. In positive-gamma regimes, short 0DTE strangles centered on max pain capture pinning behaviour. The dealer hedging that pulls price toward the pin level is the trader’s passive tailwind.
• Hedging spot positions. A spot position with overnight risk into a known catalyst can be hedged for the day with 0DTE puts. The cost is small because the option only protects until 08:00 UTC.
• Dealer-flow trades. Sophisticated traders read the 0DTE dealer book and trade alongside the hedging flow. Buying spot below the put wall and selling above the call wall in positive gamma is the cleanest expression.
• Avoidance. Many traders correctly avoid 0DTE entirely. The combination of binary outcomes and aggressive theta decay makes it a difficult instrument for anyone without a clear edge.

0DTE risk profile

0DTE options are high-risk for both buyers and sellers.

• For buyers: Maximum loss is 100% of premium paid, and that outcome is the modal case. Most 0DTE options expire worthless. A buyer needs the directional thesis to be both correct and fast.
• For sellers: Limited upside (the premium received) versus uncapped downside on naked positions. A 0DTE short call that goes in-the-money during an OpEx cascade can lose multiples of the premium in minutes.
• For both: Fast Greeks. Delta, gamma, and theta all move dramatically through the day. Position management requires constant attention. A position that was safely OTM at noon UTC can be deep ITM by settlement.

Common 0DTE misconceptions

“0DTE is just like a weekly, only shorter.” It is structurally different. Gamma and theta are non-linear in time, so 0DTE behaviour is not a scaled-down weekly. The hedging dynamics, the binary outcomes, and the theta acceleration all set it apart.

“Daily expiries do not affect spot.” Friday daily and weekly together produce the largest 0DTE flow of the week and have well-documented effects on BTC and ETH spot. Mid-week dailies are smaller but still meaningful in concentrated regimes.

“0DTE volatility is the same as longer-dated IV.” It is not. The front-week IV and 0DTE IV often diverge substantially, especially around catalysts. The 0DTE-specific implied move is its own data point.

“0DTE options are too expensive late in the day.” Often the opposite is true. By the final hours, ATM 0DTE options are extremely cheap because most of the time value has decayed. The cost-of-tail-risk per hour is small.

Frequently asked questions