0DTE stands for zero days to expiration. It describes an options contract on its final trading day, where the contract will expire at the close of that same session. Any option becomes 0DTE on its expiration day, but the term is most often used for index options such as SPX that have expirations available every weekday.

Why is 0DTE trading so popular?

0DTE contracts are cheap in absolute premium terms, carry no overnight gap risk because they expire the same day, and offer very high leverage relative to the premium paid. Daily expirations also let traders express a view on a single session rather than a multi-day horizon. Those features have pushed 0DTE to roughly 60% of total SPX options volume.

Is 0DTE trading risky?

Yes. The same properties that make 0DTE attractive make it unforgiving. Time decay is at its most aggressive on expiration day, so a long position loses value rapidly if price does not move as expected, and can expire worthless within hours. Gamma is also at its highest near the money, meaning position delta swings violently on small moves. Short 0DTE positions carry the mirror risk: limited premium collected against potentially large adverse moves.

What Is 0DTE?

Q: Which products have 0DTE options?

The major US index products now list expirations every weekday, so a 0DTE contract is available every session. SPX, SPY, QQQ, and several other high-volume ETFs and indices all offer daily expiries. SPX is where most institutional 0DTE volume concentrates because it is cash-settled and European-style, meaning there is no early assignment and no shares change hands.

Zero days to expiration — what the term actually means, and why it now dominates SPX volume

0DTE stands for zero days to expiration. It describes an options contract on its final trading day: the contract expires at the close of the same session in which you are trading it.

Strictly speaking, every option becomes 0DTE eventually — a monthly contract is 0DTE on its expiration Friday. But in practice the term refers to something newer: index products that list a fresh expiration every weekday, so a same-day contract is always available.

What Does 0DTE Mean in Practice?

The "DTE" part is simply a countdown. A contract expiring in three weeks is 21DTE; one expiring tomorrow is 1DTE; one expiring at today's close is 0DTE. Traders use the shorthand because time to expiration is the single variable that changes an option's behaviour most dramatically.

DAYS TO EXPIRATION 30DTE → slow theta decay, low gamma, wide time value 7DTE → decay accelerating, gamma building 1DTE → overnight gap risk, gamma sharp near the money 0DTE → expires at today's close theta decay at maximum gamma extreme near the money no overnight risk — the position resolves today

The short version: a 0DTE option has almost no time value left. What you are buying is close to pure directional exposure to the next few hours, with leverage that rises sharply as price approaches the strike.

Which Products Have 0DTE Options?

Daily expirations rolled out gradually across the major US index products, and are now available every weekday:

SPX — the S&P 500 index option, and where the bulk of institutional 0DTE volume sits. Cash-settled and European-style, so there is no early assignment and no shares change hands at expiry.
SPY — the S&P 500 ETF. American-style and physically settled, so assignment means actually receiving or delivering shares.
QQQ and other high-volume ETFs — daily expiries on the Nasdaq-100 tracker and a growing list of others.

The SPX-versus-SPY distinction matters more than it first appears. Cash settlement and no assignment risk are a large part of why SPX became the institutional venue for same-day trading, and it is why dealer positioning data is most meaningful there.

Why 0DTE Volume Exploded

Same-day options now account for roughly 60% of total SPX options volume — a shift that happened in only a few years. Several things drove it:

No overnight risk. The position resolves before the close. You are never exposed to an overnight gap on an unrelated headline.
Low absolute premium. With no time value to pay for, contracts are cheap in dollar terms, which lowers the barrier to entry.
High leverage. A small move can produce a large percentage return on the premium paid.
Single-session expression. Traders with a view on today no longer have to buy multi-day exposure to express it.

The Risks Are the Same Properties, Inverted

Everything attractive about 0DTE has a mirror image, and it is worth being blunt about them.

Theta decay is at its maximum. Time value bleeds out over hours, not weeks. A long option that is directionally right but too slow can still expire worthless the same afternoon.

Gamma is extreme near the money. Position delta swings violently on small price moves, so risk changes far faster than most position sizing assumes.

Selling is not the safe side. Short 0DTE positions collect limited premium against moves that can be many multiples of it. The payoff profile is a long run of small wins punctuated by occasional large losses.

Worth stating plainly: nothing on this page is trading advice. 0DTE instruments are among the most leveraged retail-accessible products available, and the majority of the volume in them is not directional retail speculation but institutional hedging and spread structures.

How 0DTE Changed the Market Itself

The more interesting consequence of 0DTE is not what it does to individual traders but what it does to the index. Because gamma is at its most intense on expiration day, an enormous share of the market's total dealer gamma now sits in contracts that will not exist tomorrow.

That reshapes intraday behaviour: support and resistance levels built from options positioning decay through the session, dealer hedging flows concentrate into the final hours, and the market can pin to a strike in the morning and ignore it entirely by the close. That mechanism is covered in detail on its own page.

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0DTE Gamma Effect — the mechanism: how same-day expiry actually moves SPX

Gamma Exposure (GEX) Explained — the metric behind the levels

Options Pinning — why price gravitates to certain strikes at expiry

The OPEX Effect — what monthly expiration adds on top