0DTE options explained: same-day expiry contracts definition
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
Cboe 0dte Options Definition Same Day Expiration: the short answer from the KenMacro desk. 0DTE options are contracts expiring on the same trading day. The desk explains their mechanics, gamma effects, and how traders position around them. The desk cross-references every claim against minimum two independent sources before publication.
Quick answer
0DTE options are contracts that expire on the same trading day they are traded, most commonly SPX and SPY options after the CBOE listed daily expiries in 2022. They carry no overnight risk, decay rapidly through the session, and concentrate dealer gamma hedging into a single day, amplifying intraday volatility around strike clusters.
What is 0DTE options?
0DTE, short for zero days to expiry, refers to options contracts that expire at the close of the current trading session. The category became liquid after the CBOE expanded SPX expirations to every weekday in May 2022, giving traders daily access to short-dated index exposure. Because all extrinsic value must collapse to zero by the closing bell, theta decay is concentrated into hours rather than weeks. Volume in 0DTE SPX options has grown to represent a substantial share of total SPX options turnover, with similar daily expiries now available on SPY, QQQ, and select single names through weekly cycles.
How traders use 0DTE options
Retail desks use 0DTE contracts for defined-risk directional bets, premium selling around expected ranges, and event-day positioning into releases like CPI, FOMC, and NFP, since the contract resolves before any overnight gap. Institutional flow tends to cluster in iron condors, credit spreads, and short strangles harvesting accelerated decay. Market makers hedging these books trade the underlying aggressively as spot approaches large open-interest strikes, producing the characteristic intraday pinning and squeeze patterns seen in SPX. The desk monitors 0DTE gamma exposure heatmaps to identify strikes where dealer hedging may suppress or amplify moves, particularly during the final two hours when gamma sensitivity peaks and small spot moves can force outsized delta rebalancing.
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Common misconceptions about 0DTE options
The widespread claim that 0DTE flow is dominated by retail gamblers is not supported by exchange data, which shows institutional participation accounts for the majority of volume through systematic premium-selling and hedging programmes. A second misconception is that 0DTE activity destabilises the broader market. CBOE and academic studies to date suggest the impact on closing volatility has been modest, though intraday pinning effects are real. Finally, 0DTE contracts are not inherently cheaper risk. The accelerated theta decay means long premium positions can lose value within minutes, and short positions face gamma risk that scales sharply as expiry approaches.
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Frequently asked
Why did 0DTE options become so popular?
Volume exploded after the CBOE introduced Tuesday and Thursday SPX expirations in 2022, completing the daily cycle. The desk attributes growth to three factors: traders seeking defined event exposure without overnight risk, systematic strategies harvesting concentrated theta, and the removal of weekend gap risk for hedgers. Lower capital requirements relative to longer-dated options and the ability to recycle capital daily also appealed to active retail accounts, particularly those running short-premium strategies on index products.
Are 0DTE options riskier than longer-dated options?
The risk profile is different rather than uniformly higher. Long 0DTE positions face severe time decay, meaning a correct directional view can still lose money if the move is too slow. Short 0DTE positions carry elevated gamma risk, where a small adverse move near expiry can produce losses far larger than the premium collected. Position sizing matters more than for longer-dated contracts, and defined-risk structures such as spreads are typically safer than naked shorts.
What is 0DTE gamma and why does it matter?
Gamma measures how quickly an option’s delta changes with the underlying price. For 0DTE contracts near the money, gamma is extremely high because small spot moves can swing the option from worthless to deep in the money within hours. Dealers hedging short-gamma exposure must trade the underlying in the same direction as the move, potentially amplifying volatility. Conversely, long-gamma dealer positioning can dampen moves and pin price near large open-interest strikes.
Can 0DTE options be traded on forex or commodities?
Daily expiry options are concentrated in US index products such as SPX, SPY, QQQ, and IWM, plus select large-cap single names through weekly cycles. Listed FX options on the CME generally follow weekly and monthly expirations rather than true daily cycles, though some OTC structures replicate similar exposure. Commodity futures options typically expire on standard monthly or weekly schedules. Traders seeking same-day expiry outside US equity indices usually access exposure through binary or short-dated OTC contracts.
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