Four indices. Their 0DTE walls. One screen.

GEX Stack puts the same-day call wall, put wall and gamma flip of SPX, NDX, QQQ and SPY side by side, rebuilt every minute from the day's option trades from the open. Because the four share one clock, you can see when they agree and when they don't.

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Screenshots: GWT V2 1.0.3 on simulated market data.

GEX Stack with SPX, NDX, QQQ and SPY panels showing price, call walls in cyan, put walls in red, flips in amber and flow bubbles, a cross-asset confluence verdict at the top and the confluence ribbon at the bottom

How to read it

Walls, flip and the touch zone.

Above the flip, dealers are net long gamma and their hedging damps moves. Below it they are short gamma and hedging amplifies them. A wall counts as being tested when price comes within a fraction of that asset's typical move.

Call wall. The strike with the most positive volume-weighted gamma today. Add a second or third wall in fainter tones.
Put wall. The strike with the most negative gamma.
Flip. Where the gamma profile crosses zero nearest to spot.
Flow bubbles. Big 0DTE trades at their strike and minute, sized by premium, ringed when they were sweeps.

Stack and Levels views

Built to compare across assets.

Confluence ribbon

Counts, minute by minute, how many assets are testing a call wall or a put wall. The brighter, the more agree. Drag it to replay the session.

Corridor cards

Each card spans three typical 15-minute moves around spot, so wall distances compare fairly across SPX, NDX, QQQ and SPY.

Big flow gauges

Which way the big trades' premium has leaned since the open, with a marker for the last 30 minutes so you see when it turns.

Biggest trades

The session's largest trades, ranked by stock-equivalent size rather than premium, so deep in-the-money prints don't crowd out the rest.

Intel

Dealer positioning from the day's trades painted as terrain, the opening expected move, and the prior close's reference levels as hairlines.

Replay and history

Step frame by frame with the arrow keys, open any past session from the date picker, or jump back to live with L.

Also on the Desk

The stoplights on your home screen.

The Desk's four gamma stoplights read the same confluence state, and its ES and NQ charts carry the 0DTE call wall, flip and put wall in futures points. GEX Stack works in index or futures points too.

See the Desk

GEX Stack in a light mint theme — GEX Stack in a day theme.

Keep exploring

Ready when the open is

Put gamma, flow and liquidity on one screen.

Get your access token, download the app for your Mac or PC and paste the token at sign-in. It takes about two minutes.

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