How to Read the Gamma Exposure Map
The Gamma Exposure Map is the single most useful screen on the platform, but only if you know what the lines mean. This guide walks through each element and the trading implication of every configuration.
Net GEX: the regime switch
Net GEX aggregates dealer gamma across all strikes. Positive net GEX means dealers hedge against price — they sell strength and buy weakness, compressing realized volatility. Negative net GEX means they hedge with price, amplifying every move. Regime first, trade idea second.
Zero Gamma: the flip level
Zero Gamma is the price where aggregate dealer gamma crosses from positive to negative. Above it, expect mean reversion and range. Below it, expect trend and expansion. Price accepting through the flip is the highest-information event on the intraday tape.
Call Wall and Put Wall
The Call Wall is the strike with the largest positive gamma concentration above spot — it behaves like a magnet and then a ceiling in long-gamma regimes. The Put Wall is its mirror below spot and often marks where hedging flows stabilize a selloff. Walls are strong until they are broken, and a broken wall frequently becomes the next acceleration point.
- Long gamma + price between walls = fade extremes toward the mid.
- Short gamma + price below the flip = trade continuation, not reversion.
- Walls shift as new flow prints. Refresh intraday; stale levels are worse than none.
Max Gamma vs Call Wall
Max Gamma is the single largest gamma strike anywhere on the chain; the Call Wall is specifically the largest above spot. They often coincide but not always, and confusing them leads to fading the wrong level. The map labels each separately for that reason.
Key takeaways
- Determine the regime from Net GEX before you look at any strike.
- Zero Gamma is the line that changes how the market behaves, not just where it sits.
- Walls are levels of dealer hedging density, not support/resistance drawn by hand.
Practice this in the terminal
FAQ
How often should I refresh the map?
Intraday: every 15–30 seconds for 0DTE work. For swing positioning, once at the open and once mid-session is enough.
Does GEX work on single names?
Yes, but only where options volume is meaningful. Index products and mega-cap names give the cleanest signal.
Test your knowledge
2 questions. Score 80% or higher to count this guide as mastered.
Keep going
Educational content only. Options involve substantial risk and are not suitable for every investor. Nothing here is financial advice.