You'll find GexHorizon hanging around a specific pocket of finance Twitter — the spot where phrases like "gamma flip" get tossed around like normal breakfast talk 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
In plain terms, here's the idea. Whenever an option gets bought or sold, a market maker ends up on the opposite side of the trade. To keep their book neutral, the market maker hedges — adjusting their stock position to cancel out the risk. GEX puts a number on how much buying or selling pressure that hedging generates for every 1% price move.
That number matters more than it sounds. A positive gamma reading usually means calmer price action. Buying the dips and selling the rallies — that's the dealer playbook here, and it smooths things out. Negative gamma turns that whole dynamic on its head — the same dealers now buy as prices climb and sell as prices drop, and that can turn a ripple into a wave. 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 turns all that calculation into three figures most traders genuinely watch: the Call Wall, the Put Wall, and the Zero Gamma Flip level. The Call Wall sits where dealer selling pressure tends to cap upside. Buying pressure tends to build a floor near the Put Wall. That flip level is basically the hinge the market swings on, between calm and chaos.
Watching spot price bounce between a call wall and a put wall on the dashboard feels a little like watching a pinball stuck between two bumpers. No crystal ball here — just a map of where pressure tends to build.
The Alerts Feature Deserves a Mention
Staring at a chart all day, waiting for a level to hit, gets old fast. 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. Not a flashy feature, but one that quietly earns its keep.
Pricing, In Plain Terms
At no cost, the free tier offers a daily snapshot of levels across major indexes — which covers a swing trader glancing at the market a couple of times a day. Step up to the paid Pro tier and you get streaming, sub-second updates, built for intraday traders or anyone dabbling in 0DTE contracts where levels move 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. Long-term investors probably won't check this more than once a week, if that. And one honest caveat worth repeating: these are estimates built from public exchange data, not guarantees. Markets couldn't care less about dashboards. Markets do their own thing, and every so often, a wall just breaks.