You'll find GexHorizon hanging around a specific pocket of finance Twitter — where terms like "gamma flip" come up over coffee as if that's just Tuesday GexHorizon. Think of it as a dashboard for watching options Gamma Exposure, or GEX, across SPX, SPY, QQQ, and a few major names.
What GEX Actually Measures
Let's keep this simple. A market maker takes the other side every time an option changes hands. To keep their book neutral, the market maker hedges — buying or selling shares of the underlying stock to offset the risk. GEX puts a number on how much buying or selling pressure that hedging generates for every 1% price move.
Don't let the dry name fool you — this number matters. Positive gamma tends to calm a market down. Dealers buy dips and sell rallies, which acts like a shock absorber. Negative gamma turns that whole dynamic on its head — dealers wind up buying into strength and selling into weakness, which can snowball a minor move into something much larger. Picture the gap between a smooth highway and a patch of black ice — that's the shift we're talking about.
Call Walls, Put Walls, and the Flip Point
GexHorizon translates all that math into three numbers most traders actually care about: the Call Wall, the Put Wall, and the Zero Gamma Flip. Dealer selling pressure tends to cap the upside right around the Call Wall. The Put Wall is roughly where dealer buying tends to hold the line underneath. At the flip point, the whole mood of the market — calm or chaotic — tends to change sides.
There's something almost comical about watching price bounce between a call wall and a put wall — like a pinball that can't escape two bumpers. Nobody's calling the future with this. It's simply a map of pressure points.
The Alerts Feature Deserves a Mention
Few people have the patience to babysit a chart just to catch one level getting tagged. GexHorizon sends level alerts directly to Discord or Telegram, putting a flip crossing or wall test right where traders already spend their time, rather than lost in a browser tab. Small feature, genuinely useful habit change.
Pricing, In Plain Terms
The free plan hands over a daily snapshot of levels for the major indexes — which covers a swing trader glancing at the market a couple of times a day. The paid Pro tier unlocks streaming, sub-second updates for people trading intraday or dabbling in 0DTE contracts, where levels can shift by the hour. Above that sits a custom enterprise option built for funds and quant desks that want raw data feeds instead of a dashboard.
Who This Actually Fits
Day traders working options, along with 0DTE traders, get the most out of this. Someone holding for the long haul might glance at it once a week, if that often. Worth repeating honestly: these numbers are estimates pulled from public exchange data, not promises. Markets couldn't care less about dashboards. Markets do their own thing, and every so often, a wall just breaks.