Description

gex.live is a dealer-positioning terminal for SPX index options. It rebuilds the dealer's options book from the 0DTE tape as it prints, second by second, rather than reading the previous day's open-interest snapshot.

Three books, side by side:
- VOLUME: gamma weighted by cumulative session volume
- OI: the open-interest convention, the way the number is drawn almost everywhere else
- MEASURED: the dealer's net position, signed print by print against the prevailing quote, with multi-leg orders signed as whole packages rather than as loose legs

They are shown together on purpose. When the three disagree, the terminal names the disagreement instead of hiding it behind one number.

Levels and greeks: zero-gamma flip, call wall, put wall, upper and lower dealer hold band, gamma percentile against the prior 20 sessions, DEX (delta) in $M of index delta, VEX (vanna) in $M per vol point, vanna and charm overlays, a 25-delta skew overlay, expected move, and realised/implied at 15m, 30m and 60m. Scope switches between all expiries, 0DTE only, and the next expiry.

Free to check before you pay: every finished session since April 2022 replays with no account, more than a thousand of them, at one-second resolution with a playback scrubber. Only the live intraday stream is paid, so every level the terminal draws can be checked against history first.

LAB: turn a rule you can see on the tape into a backtest over the full archive and get an out-of-sample verdict, including "this does not clear the bar", which is most of them. A LAB feed keeps proposing and scoring new ideas from the archive.

No signals, on purpose: directional edges were backtested across the whole archive three separate ways and none survived out of sample, so none are sold. The terminal publishes measurements and states its method.

An MCP server over streamable HTTP exposes the same session data and the Lab to Claude, Cursor and any other MCP client.