Let's talk about something that's taken the trading world by storm.
Zero-days-to-expiration options (or 0DTE for short) have completely changed how people trade. These expire at the end of the trading day. Today.
Think of it this way. You buy an option in the morning, and by 4 PM Eastern, it's either worth something or it's worthless. Game over.
The numbers are wild. Back in 2016, these options made up just 5% of all S&P 500 options trading. By mid-2023? That jumped to 43%, according to Cboe data. Charles Schwab repor ts about 1.5 million 0DTE options trade daily, accounting for nearly half of all S&P 500 options trades.
In 2022, the Cboe introduced daily expiration contracts for SPX options. Before that, you could only trade expirations on Mondays, Wednesdays, and Fridays. Now you can trade them every single day.
What Makes 0DTE Options So Different?
Time Decay Happens Incredibly Fast
Options lose value as time passes. We call this "theta" or time decay. With 0DTE options, this happens at lightning speed.
A regular option is like an ice cube on your counter melting slowly. A 0DTE option? That's an ice cube on a hot stove. Gone in minutes. If you're selling options, you can make money incredibly fast. But if you're buying? Watch your position shrink before your eyes.
Gamma Risk in the Final Hour
Gamma measures how fast your option's sensitivity changes with price. With 0DTE options, especially in the last 30-60 minutes, gamma goes absolutely crazy.
Real example: It's 3 PM and you sold put options. The SPX is comfortably above your strike price. Then 3:45 PM hits and the market drops 20 points. Suddenly those "safe" options are in-the-money and you're losing money fast.
The Data Most Guides Won't Tell You
Historical price action analysis provides crucial insights for 0DTE trading. At 2:00 PM Eastern, the SPX closes within 0.2% of its current price about 65.6% of the time based on 180 tra ding days of data. The market has this tendency to "peg" itself to certain prices as the day goes on.
Why does this matter? Because if you're selling options (which is what most 0DTE traders do), you need to know actual probabilities. Not theoretical ones from some pricing model. Historical price action tells you more about what's likely to happen than any fancy mathematical model.
The Four Main 0DTE SPX Strategies
1. Short Vertical Spreads (Credit Spreads)
This is the most common 0DTE strategy for a reason. You sell one SPX option and buy another at a further strike to cap your maximum loss. The net credit collected is your maximum profit. The difference between the strikes minus the credit is your maximum risk.
Example: SPX is trading at 5,950. You sell the 5,900 put for $8 and buy the 5,850 put for $3. Net credit is $500. Maximum loss is $4,500. If SPX closes above 5,900, the entire credit is yours.
The practical edge here is theta decay. On a 0DTE contract, time value evaporates throughout the day. Option Alpha's research shows that the most significant decay actually occurs later in the day rather than at the open, which means entering positions in the 10 AM to noon window can capture a meaningful portion of that decay without taking on the chaotic early-session volatility.
What to watch: keep position sizing small. Risking $4,500 to make $500 is only sensible if that $4,500 represents a small fraction of your total account.
2. Iron Condors
An iron condor combines a bull put spread below the market with a bear call spread above it. You collect credit on both sides, and as long as SPX closes within the range defined by your short strikes, both spreads expire worthless and you keep the full credit.
Schwartz's approach at CBOE involves looking for 10-point SPX spreads that collect approximately $1 in premium each side. The logic is that SPX cannot close both above your call strikes and below your put strikes at the same time, so you are effectively running two separate trades with only one being able to lose.
Timing matters here. Schwartz noted that iron condors work best after volatility has already occurred and is beginning to settle. Entering after a volatile open, once a range starts to establish itself, tends to work better than entering into an uncertain open.
For a deeper breakdown of running iron condors on SPX specifically, see our SPX iron condor strategy guide.
3. Buying Directional Options
Buying calls or puts on SPX 0DTE gives you leveraged exposure to a move in a specific direction, with your maximum loss limited to the premium paid.
This strategy requires you to be right about both direction and magnitude within a very short window, which makes it harder than it looks. Out-of-the-money options bought at the open need the market to move fast and in the right direction. MarketXLS notes that the mid-morning window between 10 AM and noon is typically the most active and liquid period, where directional trends from the open are starting to establish themselves.
The honest reality: buying 0DTE options directionally is high-risk speculation. Many expire worthless. It is not the right starting point for most beginners.
4. The "Set and Forget" Spread
For traders who cannot monitor positions throughout the day, a variation worth considering is entering a defined-risk spread earlier in the session at strikes well out of the money, then leaving it alone. CBOE's Schwartz specifically mentioned that a "set and forget" approach with proper sizing can be more appealing than trying to actively manage gamma-intensive positions in real time.
The key is going far enough out of the money that normal intraday SPX movement is unlikely to threaten your short strikes, while still collecting enough premium to make the trade worthwhile.
Timing Your Entry During the Day
Not all hours of the 0DTE trading day are equal. Here is a general breakdown of how professional traders approach each window:
9:30 to 10:00 AM: High volatility, wide bid-ask spreads, unpredictable price action. Most experienced traders avoid entering new positions during the first 15 to 30 minutes and let the market settle.
10:00 AM to noon: The most active and liquid window. Directional trends from the open start to establish themselves. Credit spread sellers often enter here.
Noon to 2:00 PM: Lower volatility, accelerating theta decay. Good window for premium selling if you believe the day's range is established.
2:00 to 3:00 PM: Theta decay becomes extreme. Gamma risk increases sharply. Positions that looked safe earlier in the day can turn quickly on small moves.
Final 30 minutes: Gamma is at its highest. Unless you are an experienced trader comfortable with rapid P&L swings, most guides recommend closing positions before the final 30 minutes to avoid the whipsaw risk that can occur near the close.
What Account Size Do You Actually Need?
This is the question most guides avoid answering directly. The honest answer depends on strategy.
Buying individual 0DTE calls or puts can cost as little as $20 to $100 per contract for out-of-the-money options. Credit spreads typically require capital equal to the spread width minus the credit received. On a $5-wide SPX spread collecting $1, that is $400 of capital at risk per contract.
MarketXLS suggests that a minimum account of $5,000 to $10,000 allows for adequate diversification and position sizing discipline. Below that, it becomes difficult to size positions appropriately without putting too large a percentage of capital at risk on a single trade.
The standard risk management guideline is never risk more than 2 to 5% of your account on any single 0DTE trade. On a $5,000 account, that means maximum risk of $100 to $250 per position. On a $10,000 account, $200 to $500.
The Risks You Must Understand
Gamma Explosions: Johns Hopkins researchers warn: "If you are not he dged properly, these swings could have an enormous negative impact.
Real example: December 18, 2024, when Fed Chair Powell announced fewer rate cuts. The SPX plunged and traders holding unco vered short positions faced catastrophic losses.
The Win Rate Trap: Many 0DTE strategies boast 80% win rates. But it's like "picking up pennies in front of a steamroller." You might win 20 trades in a row, then one trade wipes out everything. Proper position sizing and stop-loss discipline are essential, as backtests of SPX iron condor strategies have shown.
Day Trading Rules: If you open and close a 0DTE option on the same day, that counts as a day trade under FINRA rules. H owever, if the option expires worthless, it doesn't count as a day trade. Accounts under $25,000 are limited to three day trades in a rolling five-day period.
How to Start Without Blowing Up Your Account
Paper Trade First: Charles Schwab warns that 0DTE options aren't suitable for beginners. Paper trade for at least 30 days. Track your maximum drawdown and emotional reactions to losses.
Never Trade Naked Options: 95% of 0DTE traders use defined-risk strategies like spreads . Naked options have unlimited risk. Always use spreads.
Keep Positions Tiny: Risk 1-2% of your account per trade maximum. Professional traders often risk just 0.5% per trade. Because of rapid time decay, you can generate meaningful returns with small positions.
Avoid Trading Around Big News: FOMC announcements, CPI releases, jobs reports. Research shows 0DTE volume decreases during sharp market moves.
Have Exit Rules: Set profit targets and stop losses before entering. Many successful traders close spreads at 50-60% of maximum profit and use a stop loss at 2-2.5x their credit received.
Is 0DTE Trading Right for You?
0DTE options trading is not gambling, but it's not for everyone either. These instruments demand deep understanding of options Greeks (especially gamma and theta), active position monitoring throughout the trading day, strong emotional discipline, sufficient capital to handle losing streaks, and commitment to continuous learning.
0DTE trading grew from 5% to over 50% of SPX options volume in less than a decade because these tools serve real purposes: hedging event risks, expressing short-term views, and generating income. But beginners w ho jump in without preparation face high probability of substantial losses. Small mistakes become account-destroying disasters.
If you move forward, start small, focus on risk management, and remember: protecting capital always trumps chasing profits. In same-day options expiration, survival comes first.
Frequently Asked Questions
Can I trade 0DTE SPX options in a cash account?
Yes, defined-risk strategies like vertical spreads are available in cash accounts. Naked options require margin approval. Our SPX trading strategies for cash accounts guide covers the full range of strategies available without a margin account.
What is the best time of day to trade 0DTE SPX options?
The 10 AM to noon window is generally the most stable entry period for credit spread sellers. Avoid the first 15 to 30 minutes after open and the final 30 minutes before close where gamma risk is highest.
How much money do I need to start trading 0DTE SPX options?
A minimum of $5,000 to $10,000 is recommended. This allows you to size positions at 2 to 5% of account value per trade, which is the standard risk management guideline for this strategy.
Why do so many 0DTE options expire worthless?
Most 0DTE strategies involve selling out-of-the-money options. The majority of trading days see SPX move within a contained range, so out-of-the-money options frequently expire with no value. This is why selling premium is attractive but also why a single large move can cause significant losses.
What happens if I cannot monitor my 0DTE position during the day?
Consider a set and forget approach -- enter a defined-risk spread with strikes far enough out of the money that normal intraday SPX movement is unlikely to threaten your position, then leave it alone. This works better than actively managed positions for traders with limited time during the trading day.
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