0DTE Options Strategy Guide: Trading Gamma Exposure at Same-Day Expiry
Same-day expiry options are now the largest single bucket of SPX volume — and the most violent gamma environment on the board. Reading them structurally is a distinct skill, and most retail approaches to 0DTE skip it entirely.
0DTE contracts carry the highest gamma of any expiry, which means the dealer hedging flows that shape intraday price are at their most concentrated — and their most punishing — in this contract set. A market that looks orderly on the daily chart can behave completely differently inside the same-day expiry, for reasons that are structural, not random.
This is why generic options education fails on 0DTE. The levels that matter migrate during the session. The afternoon behaves differently from the morning for a specific, mechanical reason most traders have never heard named. And the sizing math that feels survivable on weekly options is quietly ruinous at same-day expiry. Every one of these has a precise explanation — and each one is the kind of thing traders usually discover by paying for it.
The full 0DTE material walks through the structure of the same-day expiry session end to end: what makes it different, how to read it, what to avoid, and how it connects to the rest of the gamma-exposure framework.
What the Full Lesson Covers
- Why 0DTE gamma is different
- Who actually trades 0DTE
- Intraday positioning shifts
- Reading the 0DTE range
- The post-2pm effect
- Common 0DTE retail mistakes
- A structural read framework
- Position sizing for same-day expiry
- Why backtests mislead on 0DTE
The 0DTE Specialization
This article is a preview. The complete lesson — and the curriculum it builds on — lives inside the GEX Levels Education Library: 19 modules and 749,543 words of structured, professional-grade material covering options flow, gamma exposure, dealer positioning, and session workflow. One-time purchase, no subscription.
Explore the Library — $249.99 one-time