Announcing the Launch of the Financial Source GEX Engine
Know the key levels that market makers are forced to buy and sell ahead of time.
~45%
of SPX options volume is now 0DTE
Market makers must buy and sell futures to offset their options risk.
Zero-day options—contracts that expire at the end of the same trading day—have exploded in popularity and now account for roughly 45% of SPX options volume. Because there is almost no time left to expiry, their gamma can change sharply as the index moves.
Dealers who take the other side of those trades do not want a directional bet. They continuously buy or sell ES and NQ futures to keep their exposure hedged. That creates a stream of mechanical market-maker flow around the strikes where options positioning is concentrated.
The opportunity is not to predict every move. It is to map where that forced buying and selling may appear, understand whether dealers are more likely to stabilise or amplify price, and use those levels as context for trading alongside the flow rather than blindly against it.
Follow the same sequence you will use before and during the session: identify the regime, map dealer positioning, watch price at those levels, and move to the execution view.
01
Start with the question that shapes the whole session: what kind of market are you trading? See where ES or NQ sits relative to the Zero Gamma Line, read the current gamma and volatility regime, and compare price with the expected-move budget before looking for a setup.
Watch the Market Regime walkthrough02
Turn a dense options chain into a visual map of dealer positioning by strike. The profile separates established open-interest gamma from today’s live volume gamma, highlights structural and intraday flip lines, and makes high-friction “skyscrapers” and low-friction air gaps easy to spot.
Watch the GEX Profile walkthrough03
Put the dealer map directly onto the active ES or NQ futures chart. Toggle the Zero Gamma Line, Call and Put Walls, Max Pain, expected move, charm, and live-flow levels to see how price is actually reacting—without manually converting cash-index levels into futures prices.
Watch the Price Chart walkthrough04
Find the Strategic Levels section and use the built-in learning links to jump straight to the relevant mini-course explanations. It gives you a faster route from seeing a level in the Engine to understanding what it means.
Watch the Strategic Levels walkthroughThree complementary data lenses turn raw positioning into a clearer map of where dealer flow may matter.
Listed index-options open interest and volume provide the transparent foundation across strikes and expirations.
Gamma calculations translate options positioning into estimated hedging pressure, regime changes, and flip levels.
Off-exchange positioning adds another view of levels that may matter beyond the visible options chain.
Included with the Engine
Learn why dealers hedge, how gamma changes market behavior, and how to read every screen and level in the Engine—then return to individual lessons whenever you need a clear refresher.
Watch the GEX Engine Mini-CourseLaunch access / limited price window
Get launch access for $29/month. This will go up to $99/month on September 7.
LAUNCH PRICE
$29/ month
REGULAR PRICE
$99/ month
THE $29 LAUNCH PRICE ENDS IN
Deadline: September 7, 2026 at 12:00 AM America/New_York.