What Are 0DTE Options?
Zero days to expiration (0DTE) options are options contracts that expire on the same day they are traded. Once limited to monthly expirations on the third Friday, the introduction of daily S&P 500 (SPX) and other index expirations in 2022 revolutionized options markets. Now, every single trading day is an expiration day for SPX options, and 0DTE trading has exploded in popularity.
The appeal is simple: 0DTE options are extremely cheap (they have almost no time value left), provide enormous leverage, and can produce triple-digit percentage returns in hours or even minutes. But they are also the most dangerous options available.
Why 0DTE Options Behave Differently
Near-expiration options have extreme Greek characteristics that make them behave very differently from options with weeks or months remaining:
Extreme gamma: 0DTE at-the-money options have the highest gamma of any option. Their delta can swing from 0.20 to 0.80 in a matter of points on the underlying. This means small price moves create enormous percentage changes in the option's value, both for and against you.
Rapid theta decay: Time value evaporates throughout the day. An option worth $2.00 at the open might be worth $0.50 by midday even if the underlying has not moved. You are fighting the clock every minute.
Binary-like payoff: As expiration approaches, 0DTE options increasingly behave like binary bets. They will expire worthless or in-the-money. The smooth curve of options pricing breaks down into a sharp step function.
Common 0DTE Strategies
Directional bets: The simplest structure. A long call expresses a view that the market rallies today, a long put a view that it declines. Because an option carries the most time value at the open, the entry time changes what the position costs.
Credit spreads: A short-dated credit spread (bull put or bear call) collects premium that decays rapidly throughout the day. If the underlying stays within the range, both legs expire worthless and the seller keeps the premium.
Iron condors: An iron condor combines a short call spread and a short put spread, collecting premium from both sides. It keeps the premium if the underlying stays between the short strikes and loses if a large move breaks through either side.
Straddles and strangles: A long straddle or strangle holds both a call and a put and gains from a large move in either direction, net of the premium paid for both legs. Ahead of a known intraday catalyst like a Fed announcement or a major economic data release, that premium already reflects the move the market expects.
The Risks of 0DTE Trading
Total loss is possible: A long 0DTE option that finishes out of the money expires worthless, a 100% loss. Unlike longer-dated options that retain some value after an adverse move, 0DTE options can go to zero within hours.
Gamma risk cuts both ways: The same extreme gamma that produces windfall profits can produce devastating losses. A 0DTE credit spread that looks safe at 10 AM can turn into a full loss by 2 PM if the market makes a strong directional move.
Pin risk: Near expiration, stocks and indices can oscillate around key strikes, causing options to flip between in-the-money and out-of-the-money repeatedly. This creates hedging challenges and unpredictable assignment risk.
Market impact: The sheer volume of 0DTE trading now affects market structure. Large 0DTE positions create intraday gamma exposure that influences how the market moves. Ironically, 0DTE traders collectively influence the very price they are trying to predict.
Risk Management Rules
Risk controls discussed for same-day trading include a per-trade loss cap set as a fixed fraction of the account, a maximum loss defined before entry, spreads rather than naked options so the loss is capped by the structure, and a decision made in advance about holding through known events. 0DTE trading is not investing; it is short-term speculation.
SquawkFlow displays GEX computed from daily-settled open interest. That snapshot includes 0DTE positions carried through the prior settlement, but it cannot include contracts opened and closed during the current session.