Zero-days-to-expiry options now account for a large share of index options volume, and most of what is written about them treats them as ordinary contracts in a hurry. They are not. Three properties change at expiry day and each one changes how a position has to be handled.
On an expiry-day contract, delta moves violently as spot crosses the strike. A contract that was barely responsive becomes nearly one-for-one with the underlying over a very small move. That is the attraction and the danger: the same mechanism that produces a fast gain produces an equally fast loss, and position sizing built on a normal week's behaviour will be far too large.
On a 30-day option, time decay is a slow drag you manage. On a 0DTE contract the entire remaining extrinsic value disappears within hours, and the rate accelerates into the close. Holding for a thesis to play out is not a neutral act — the position is losing value continuously while you wait, and the loss accelerates.
The practical consequence is that 0DTE positions have a natural maximum hold. Past some point the trade is no longer the trade you entered, and the only question is how much extrinsic value is left to lose.
Index 0DTE near the money is among the most liquid instruments available. Move a few strikes out, or away from the index names, and depth evaporates. The spread on an expiry-day contract that nobody wants can be a large fraction of the premium, and on the exit that spread is a cost you pay with no say in it.
| Property | 30+ DTE | 0DTE |
|---|---|---|
| Delta behaviour | Gradual | Violent near the strike |
| Time decay | A daily drag | A clock running out |
| Natural hold | Days to weeks | Minutes to hours |
| Liquidity away from the money | Usually workable | Often unusable |
| Dominant risk | Direction | Timing and execution |
On a longer-dated position, a few cents of slippage is noise against the thesis. On a contract trading at a few tens of cents that resolves inside a session, crossing the spread twice can be a substantial share of the expected move. The strategy and the execution are not separable at this timescale.
This is why short-dated systems live or die on things that sound unglamorous: whether the strike is actually trading today, how wide the book is at the moment of entry, how quickly an exit can be priced and placed, and what happens when market data is interrupted while a position is open.
They concentrate different risks. Direction matters less because there is no time for a thesis to develop, while timing and execution matter far more. Gamma near the strike means an adverse move arrives as quickly as a favourable one, so position sizing built on a normal week's behaviour will be too large.
Decide before entry. Extrinsic value disappears within hours and the rate accelerates into the close, so an open-ended hold has an undefined cost. Short-dated systems typically define a maximum hold and exit on it regardless of the thesis.
Index contracts near the money are extremely liquid. A few strikes out, or outside the index names, there may be almost no interest in an expiry-day contract, and the quoted spread reflects that. On a contract trading in cents, that spread is a large share of the premium.
The execution side benefits most from automation, because the decisions that matter happen in seconds and are mechanical: is the strike trading, is the book tight enough, has the entry condition confirmed, is the exit priced. The judgement about what to trade is a separate question.
Options Sniper is a free desktop terminal for 0‑5 DTE options. It runs paper or live and ships with a simulator that drives the same code the live app uses. Open source on 30 October 2026.
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