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There’s a quiet structural shift happening in the market that most retail traders completely miss. It has nothing to do with a hot sector, earnings beats or the latest Fed headline.
It’s the explosive rise of 0DTE options.
What started as a niche playground for day traders has transformed into the primary driver of intraday price action.
In the S&P 500 index (SPX), 0DTE contracts now consistently command between 50% and 60% of total daily options volume.
On many days, more options contracts exchange hands than actual shares of the underlying index.
The average daily volume of SPX options sits at a staggering 4.8 million contracts, representing trillions in daily notional value.
When that much liquidity flows through contracts expiring the very same day, it ceases to just participate in the market — it actively forces the market’s hand.
This is driven by dealer hedging risk. When traders flood the market with short-dated calls or puts, Wall Street market makers on the other side must instantly buy or sell S&P 500 futures to hedge their exposure.
This constant balancing act creates an aggressive intraday momentum engine — the structural tail wagging the dog.
The Morning Checklist: Reading the Flow
Because 0DTE options trade heavily around the clock in the global electronic session, analyzing how overnight order flow accumulates gives a clear look at the structural bias dealers face right before the opening bell rings in New York.
By tracking the open interest and early morning volume of these same-day contracts, we can map out exactly where the pressure cooker is building. Here is the process:
- Isolate the Day’s Expirations: Isolate the SPDR S&P 500 ETF Trust SPY / S&P 500 index SPX contracts expiring at the end of the current trading day.
- Tally the Dollar Flow: Aggregate the total premium value flowing into the calls versus the puts.
- Calculate the Net Balance: Subtract the put value from the call value to find the net structural position.
A heavily positive net reading indicates deep call buying or put selling, leading to a bullish posture where dealers are forced to buy underlying assets to stay neutral.
A sharply negative reading indicates heavy put buying or call selling, creating a structural drag where dealers are forced to sell.
Probability Over Prediction
Thanks to advanced data scraping and software automation, tracking this institutional flow — once the exclusive domain of market-making firms — is now accessible to retail accounts.
It requires no massive capital; many of these structural setups can be traded using defined-risk spreads for as little as $50.
Reality check: This is not a “black box” miracle system.
No strategy wins every time, and losses are simply the cost of doing business.
This approach is about mechanical probability — aligning intraday trades with the massive institutional hedging flows that dictate modern market microstructure.
To better trading,
Alex Reid
WealthPin
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*This is for informational and educational purposes only. There is inherent risk in trading, so trade at your own risk.
P.S. I’m Already in Pittsburgh – Make Sure You’re With Me Live Tonight
I arrived in Pittsburgh last night.
Today, I’m doing a little exploring before Nate and I sit down for what could be our most interesting event of the month.
Because tonight, we’re unveiling an overnight trading strategy built around a powerful market force most traders never even look at.
The goal?
Positioning the night before the opening bell rather than reacting after the move has already started.
And to make tonight even more exciting, one attendee is going home with $1,000 cash.
The winner will be chosen live during the event.
No trading guarantees, obviously.
But between the giveaway and the strategy reveal, tonight is shaping up to be something special.
Make sure you’ve reserved your seat right here.
