Published June 10, 2026 · SpotGamma Research
0DTE options are option contracts that expire the same trading day they are bought or sold — “zero days to expiration.” They are the fastest-growing corner of the options market: on many sessions, same-day expirations account for roughly half of all S&P 500 (SPX) options volume, per Cboe data. Because gamma is at its maximum near expiration, 0DTE flow forces market makers into aggressive same-day hedging — making 0DTE positioning one of the strongest intraday forces in the S&P 500.
0DTE at a Glance
| Item | Detail |
|---|---|
| Definition | Options expiring the same day they are traded (zero days to expiration) |
| Core tickers | SPX, SPY, QQQ, IWM — expirations every trading day; most large single stocks expire weekly (Fridays) |
| Why daily expirations exist | Cboe added Tuesday/Thursday SPX expirations in 2022, completing the every-weekday calendar |
| Share of SPX volume | Approaching or exceeding ~50% on many sessions (Cboe data) |
| Expiration time | Market close, 4:00 p.m. ET (0DTE SPX weeklys are PM-settled) |
| Defining risk feature | Maximum gamma: option deltas swing violently with small moves in the underlying |
| Market impact channel | Dealer hedging of 0DTE flow creates intraday buying/selling pressure in the underlying |
What Are 0DTE Options?
Every listed option has an expiration date. “DTE” simply counts the days remaining — a 30DTE option expires in thirty days, a 0DTE option expires today. A 0DTE contract isn’t a special product: any option becomes 0DTE on its final day. What changed is availability. Since Cboe completed the every-weekday SPX expiration calendar in 2022, traders can buy or sell an option expiring the same afternoon on every single trading day — and they do, in enormous size.
The appeal is precision and price. A 0DTE option carries almost no time premium, so it is the cheapest possible way to express a view on what happens between now and the close. It is also the most unforgiving: there is no tomorrow to be right. Whatever thesis a 0DTE trade expresses gets settled at 4:00 p.m. ET, in full.
Why 0DTE Trading Exploded
Three forces converged. First, the exchanges built the venue: SPX gained Tuesday and Thursday expirations in 2022, joining the existing Monday/Wednesday/Friday listings — and SPY, QQQ, and IWM followed with daily expirations of their own. Second, retail platforms made short-dated options as easy to trade as shares, and a generation of traders adopted them for defined-risk day trading. Third, institutions found uses on the other side: systematic premium-selling programs, intraday hedging, and event-day positioning around CPI prints, Fed meetings, and earnings.
The result, per Cboe’s own published research, is that same-day expirations now routinely account for around half of SPX options volume — a structural shift in how the world’s most important options market trades, not a passing fad.
How 0DTE Options Move the Market
Here is the part most 0DTE explainers skip — and the reason SpotGamma models this flow every day. When a trader buys a 0DTE call, a market maker is usually on the other side. That market maker doesn’t want directional risk, so they hedge by buying the underlying. When the trade is a put, they hedge by selling. Multiply that across hundreds of thousands of same-day contracts and dealer hedging becomes a genuine intraday flow — one that can push the S&P 500 toward some price levels and away from others.
What makes 0DTE special is gamma — the rate at which an option’s delta changes as the underlying moves. Gamma is at its maximum when an option is at the money and close to expiration. A 0DTE option at the money is the most gamma-dense instrument in the listed market: a small index move forces a large re-hedge. This is the engine behind the intraday pinning, acceleration, and reversal patterns that 0DTE traders see every week — and it’s the same dealer-hedging mechanic explained in our gamma exposure (GEX) guide, compressed into a single session.
Two regimes matter:
- Dealers long gamma: hedging means selling into rallies and buying dips — a stabilizing flow that dampens moves and “pins” price near large-open-interest strikes into the close.
- Dealers short gamma: hedging means buying into rallies and selling into declines — an amplifying flow that accelerates moves and feeds intraday momentum in both directions.
Which regime is in force — and at which strikes it flips — is exactly what SpotGamma’s positioning models measure. The HIRO indicator takes it one step further: it estimates the hedging impact of options trades in real time, so you can watch the 0DTE flow hit the tape as it happens rather than inferring it afterward.
Common 0DTE Strategies
Most 0DTE activity falls into a handful of structures:
- Directional calls/puts (“lottos”): cheap, high-gamma bets on an intraday move. Maximum convexity, minimum forgiveness — the majority expire worthless.
- Credit spreads: selling an out-of-the-money call or put spread to collect same-day premium, betting the index stays away from the short strike. Defined risk, but the gamma works against the seller late in the day.
- Iron condors: a call spread and a put spread sold together, betting on a range-bound session. Popular on quiet days; vulnerable to afternoon trend extensions.
- Butterflies: pinning trades that pay off if the index settles near a chosen strike — effectively a bet on where dealer hedging will hold price into the close.
Whatever the structure, price it before you trade it. SpotGamma’s free options profit calculator models option P&L with full Greeks and breakevens — and on a 0DTE trade, knowing your gamma and theta exposure is the difference between a defined-risk strategy and a guess.
The Risks: Why 0DTE Punishes Mistakes
0DTE risk is not subtle, and it cuts both ways:
- For buyers — total premium loss is the base case. Out-of-the-money 0DTE options decay to zero by 4:00 p.m. unless the move happens. Theta is not a slow bleed at 0DTE; it is a same-day expiration countdown.
- For sellers — gamma risk is at its lifetime maximum. A position that is 95% probable to expire worthless at noon can be deep in the money by 3:30 p.m. Short 0DTE premium has a long history of collecting small wins punctuated by outsized losses.
- Execution and slippage: spreads widen exactly when you need to adjust — during fast moves — and there is no time to wait for better fills.
- Settlement mechanics: SPX 0DTE weeklys are cash-settled at the 4:00 p.m. close, while SPY/QQQ options settle in shares with assignment risk — know which instrument you’re trading.
Position sizing does the heavy lifting: most experienced 0DTE traders risk a small, fixed fraction per day precisely because single-session variance is extreme. Nothing here is investment advice — 0DTE trading is a high-risk activity where the majority of speculative buyers lose their premium.
How SpotGamma Tracks 0DTE Flow
SpotGamma models the options market’s hedging footprint across every expiration — and same-day contracts are where that footprint is sharpest. Subscribers use three lenses on 0DTE:
- Key levels before the open. SpotGamma’s daily levels — Call Wall, Put Wall, Volatility Trigger™ — map where options positioning concentrates, which is where dealer hedging pressure tends to pin or repel price intraday.
- Real-time flow with HIRO. HIRO translates live options trades into their estimated hedging impact, separating mechanical dealer flow from discretionary buying — on the timescale 0DTE actually trades.
- Daily context in Founder’s Notes. Every morning’s note covers how positioning — including same-day expirations — frames the session’s risk.
These tools are included in SpotGamma subscriptions — compare plans here.
Frequently Asked Questions
What does 0DTE mean in options trading?
0DTE stands for “zero days to expiration” — an option contract on its final trading day, expiring at that day’s market close. Any option becomes 0DTE on expiration day; the term usually refers to trades deliberately opened and closed within that final session.
Which tickers have 0DTE options every day?
SPX, SPY, QQQ, and IWM list expirations every trading day, so a 0DTE contract exists every session. Most large single stocks (and other ETFs) have weekly expirations, making Friday their only regular 0DTE day.
What time do 0DTE options expire?
At the market close, 4:00 p.m. ET. SPX 0DTE weeklys are cash-settled on the closing print; SPY and QQQ options are physically settled, which introduces share assignment for in-the-money contracts.
How much of SPX options volume is 0DTE?
Per Cboe data, same-day expirations account for roughly half of SPX options volume on many sessions — up from a small fraction before daily expirations were completed in 2022.
Do 0DTE options cause market volatility?
It depends on dealer positioning. When dealers are long gamma from 0DTE flow, their hedging suppresses intraday volatility and pins price near big strikes. When they are short gamma, hedging amplifies moves. Exchange research has generally found 0DTE’s net market-wide effect to be balanced — but on individual sessions, the positioning regime visibly shapes intraday behavior, which is what SpotGamma’s GEX models are built to measure.
Are 0DTE options profitable?
For most speculative buyers, no — out-of-the-money same-day options usually expire worthless, which is why they are cheap. Consistent 0DTE traders treat it as a defined-risk, small-size, process-driven activity, often informed by where dealer hedging concentrates rather than by directional hunches.
How do market makers hedge 0DTE options?
By trading the underlying index or ETF against their option inventory, continuously, as deltas change. Because 0DTE gamma is extreme, those hedge adjustments are large and frequent — and in aggregate they become an intraday flow that can dominate S&P 500 tape action, particularly in the final hours of the session.
Bottom Line
0DTE options turned every trading day into expiration day. That changed more than trading menus — it concentrated the options market’s hedging machinery into single sessions, making dealer positioning a daily intraday force in the S&P 500. Whether you trade 0DTE or just trade around it, the flow is part of your market now. The traders with an edge are the ones who can see it: start with the GEX guide, watch it live with HIRO, and see tomorrow’s key levels with a SpotGamma subscription.
Last updated June 10, 2026. This article is for informational purposes only and is not investment advice. Options trading involves substantial risk; 0DTE strategies can result in rapid, total loss of premium or significant losses for sellers. Consult a licensed advisor before trading.
