The 0DTE trap, and the weekly risk review

Two things to finish with. The first is the most heavily marketed options trade of the last few years, same-day expiration index options, and why every lesson in this course points at it as the place where the arithmetic is least forgiving. The second is a checklist: the ten questions to answer every week so that the portfolio Greeks table from Module 1, the sizing rules from lesson 1 and the management rules from Modules 2 through 5 are actually applied rather than merely known.

The 0DTE condor

An index at 5,000 with daily options. A one-day expected move at 15% IV is about 5,000 × 0.15 × √(1/252) ≈ 47 points. A trader sells a 10-delta iron condor on the morning of expiration: short 4,940 put / long 4,920 put, short 5,060 call / long 5,080 call. Twenty-point wings.

• Credit about $1.50 ($150). Max loss 20 − 1.50 = $18.50 ($1,850). Ratio 12.3 to 1.
• Breakevens 4,938.50 and 5,061.50, about ±1.2%.
• Probability of finishing inside: roughly 80–85%, consistent with the 10-delta strikes.

Expectancy at those odds, assuming the losses average about $1,200 rather than the full $1,850: 0.83 × $150 − 0.17 × $1,200 = $124.50 − $204 = −$80. Even with a generous win rate, the average loss is eight times the average win and the trade is negative before the four-leg bid-ask, which on a $1.50 credit is easily $0.30. The market is pricing the strikes fairly, as it prices everything, and the friction is a fifth of the credit.

That is the ordinary arithmetic of any credit spread. What makes 0DTE a trap is what surrounds it:

1. Gamma with no time. From Module 1, at-the-money gamma with hours left is enormous. A 0.5% move (25 points) at 1 p.m. moves the short put from 10 delta to 35 delta; the condor goes from +$1.20 to about −$5.00 in an hour. There is no 21-day rule, no "close at 50% and wait"; there is only the next print.
2. Stops do not fill through moves. A stop at 2× credit ($3.00 condor value) is passed in a single sweep when the index drops 30 points in three minutes. Realized losses cluster at $8–$15, not $3.
3. Daily repetition compounds the sizing error. A trader who takes this trade every day and sizes it at 2% of the account per day is exposed to 10% of the account every week, and the "sum of max losses" rule from lesson 1 is breached by design, one day at a time.
4. Adding after a loss. The $1,850 loss on Tuesday makes Wednesday's $150 credit look like a way back. Sizing up to recover is the sequence that ends accounts, and same-day trades offer the chance daily.
5. Settlement details. Afternoon-settled index options settle at the 4:00 p.m. close; morning-settled ones use an opening print that can differ by more than the width of the condor from Thursday's close. Know which you hold.
6. The narrative. "Consistent daily income" is the description of the left side of the distribution in Module 3, lesson 4, without the right side.

0DTE condor: value through the day on a 0.5% afternoon move

  Value
  +1.20 |  * * * *  * *
        |              *
    0   |----------------*-------------
        |                  *
  -3.00 |  stop here?        *   <- passed in one sweep
        |                       *
  -5.00 |                         * *
        +----+----+----+----+----+----+
        9:30  11   12   1    2    3   4pm

If you trade it anyway: defined risk only, sized so that the max loss is a normal daily loss for the account rather than a 2% event (which means far smaller than the rule 1 number, because the max loss is reached far more often), no adding after a loss, no short at-the-money strikes in the last hour, and a fixed number of trades per week decided in advance.

The weekly risk review

Friday after the close, or Sunday evening. Ten questions, each with a number or a list as the answer. Most take a minute with the platform's position summary.

1. Book Greeks. Beta-weighted delta (Module 6) as the dollar cost of a 1% index move; net weighted vega; net theta; net gamma. Write the four numbers next to last week's.
2. Stress grid. Index −5% with IV +15 points, index +5% with IV −5 points, from delta, gamma, vega and theta (Module 1, lesson 4). Both as a percentage of the account.
3. Sizing rules. Sum of max losses versus the 20% cap; largest single position versus the 2% cap; net weighted vega versus the limit; stress loss on any undefined-risk position (lesson 1).
4. DTE ladder. Every position with fewer than 21 days to expiration goes on a list with the action: close, roll, or hold with a written reason (Module 2, lesson 3).
5. Tested and near-tested strikes. Any short strike within one expected move of the price for the time remaining (Module 3, lesson 3). Decide now, not on Tuesday.
6. Events next week. Earnings on any underlying, ex-dividend dates against any in-the-money short call (Module 2, lesson 4), central bank meetings, index rebalances and expiration days. Positions through an event are re-checked on purpose or closed.
7. Margin. Buying power used as a percentage; the requirement under a 10% house-margin increase; whether any position would be liquidated on a −10% Monday (lesson 2).
8. Liquidity. Whether every position could be closed Monday morning within a few cents of the mid. Any position that could not is smaller next time.
9. Concentration. Vega and beta-weighted delta grouped by underlying and by sector. Five condors in one sector are one trade (lesson 1).
10. Plan compliance. For each position closed this week: was the exit the planned target, the planned stop, or something else? "Something else" gets one sentence in the journal.

The review is the whole course applied. The net Greeks come from Module 1, the exit rules from Modules 2 to 5, the hedge sizing from Module 6 and the limits from this module. Run it weekly and none of the individual rules has to be remembered under pressure, because the list remembers them.

The risk framework behind the sizing numbers is in risk management; every structure in this course can be built and stress-tested in the options profit calculator before it goes into the book.

Key idea: A 0DTE condor is a fairly priced credit spread with the gamma of the last day, no time to manage, stops that fill through moves, and a daily invitation to size up after a loss; the arithmetic is negative after friction even at an 83% win rate. The weekly review is ten numbers and lists that apply everything in this course before Monday, so that no rule has to be recalled at the worst moment.

Try it: Run the ten-question review on your current book, or on a paper book of five positions from this course, and write the answers on one page. Time it. Then put the page next to your platform and decide which of the ten questions you would have been unable to answer from memory during a fast sell-off.

Recap

• A 10-delta 0DTE condor collects about $1.50 against $18.50 of risk; at an 83% win rate and realistic losses the expectancy is negative before a bid-ask that takes a fifth of the credit.
• Same-day gamma removes every management rule: a 0.5% afternoon move turns +$1.20 into −$5.00 and stops fill through it.
• Daily repetition and sizing up after losses breach the sum-of-max-loss rule one day at a time.
• The weekly review: Greeks, stress grid, sizing rules, DTE ladder, tested strikes, events, margin, liquidity, concentration, plan compliance.
• The review is the course applied; run it every week so nothing has to be remembered under pressure.