gex.live
SPX dealer gamma, rebuilt every second from the tape
What it does
Rebuilds the SPX dealer options book from the live tape: zero-gamma flip, call and put walls, hold band, and DEX/VEX/vanna/charm per strike. Positions are signed from trades, not the call/put convention. Volume, open interest and measured flow sit side by side, so you can see where they disagree. 1,000+ finished sessions are free forever, no account. A backtesting Lab and an MCP server come with it. No buy/sell signals.
LIVE SPX dealer gamma (GEX), vanna, charm and the zero-gamma flip every second. REPLAY 1,000+ sessions free. LAB backtests your rules with honest verdicts.
SPX is 77 points above the zero-gamma flip at 7,641, so dealer hedging is damping moves rather than chasing them. Net dealer gamma sits at the 95th percentile of the archive. These are measurements of dealer positioning, not buy or sell signals. This page is the live terminal and needs JavaScript. The same reading in plain HTML, updated through the session, is on /now . Every finished session is free at /sessions ; 2026-09-04 has its own page at /session/2026-09-04 . Every historical session is free, forever. A subscription adds today — the dealer’s book rebuilt every second as itfrom firmtape.com
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