SPX dealer positioning rebuilt from the 0DTE tape every second: net gamma, DEX, vanna, charm and skew by strike, the zero-gamma flip, call and put walls, hold band. Three books compared. Backtesting Lab and MCP server. Every past session free.
This page is designed to help you find out whether FirmTape is good and if it is the right choice for you.
FirmTape is a dealer-positioning terminal for SPX. It rebuilds the dealer's options book from the 0DTE tape as it prints, second by second, rather than reading yesterday's open-interest snapshot.
Three books, side by side
Shown together on purpose: when they disagree the terminal names it instead of hiding it behind one number.
Levels and greeks
Free to verify before you pay
Every finished session replays with no account: more than a thousand of them, back to April 2022, at one-second resolution with a playback scrubber. Only the live intraday stream is paid, so every level 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 honest out-of-sample verdict — including "this does not clear the bar", which is most of them. The 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.
From an AI assistant
An MCP server over streamable HTTP exposes the same session data and the Lab to Claude, Cursor and any other MCP client.
Listed in
Free session archive
Every finished session since April 2022 is free to replay with no account — 1,000+ days
Live dealer positioning
SPX net gamma by strike, rebuilt from the 0DTE options tape as it prints
Key levels
Zero-gamma flip, call wall, put wall, upper and lower dealer hold band, gamma percentile
LAB backtesting
Turn a rule you see on the tape into a backtest over the full archive, with an out-of-sample verdict
MCP server
Streamable-HTTP endpoint at mcp.gex.live — sessions and the Lab from Claude, Cursor or any MCP client
Full greek set
DEX (delta), vanna and charm exposure by strike, alongside gamma
Three books compared
Cumulative volume, open interest and measured signed flow, shown side by side
LAB feed
Research ideas generated from the session archive and scored against it
It started as a disagreement with how dealer gamma is usually computed. The standard picture comes from the previous day's open-interest snapshot plus a convention about which side the dealer holds. That is a guess about yesterday, used to explain today. The question was what the book looks like if you rebuild it from the tape as it actually prints.
So the pipeline was built to do that on SPX 0DTE and the near expiries, and the finished sessions were archived rather than thrown away — which is why the whole history back to April 2022 is now free to replay.
The archive then answered a question nobody wants answered: it was used to backtest directional edges three separate ways, and none of them survived out of sample. That result shaped the product. Instead of dressing a weak edge up as a signal service, gex.live sells the measurement and states the method, and the Lab exists so people can run the same honest test on their own rules and get a real out-of-sample verdict back.
Most dealer-gamma tools read yesterday's open-interest snapshot and apply a convention: calls count as dealer-long, puts as dealer-short. gex.live rebuilds the book from the 0DTE options tape as it prints, second by second, and shows three books side by side - cumulative volume, open interest, and measured signed flow - so you can see where they agree and where they do not.
The second unusual thing is that the whole history is free. Every finished session since April 2022 replays with no account, so every level the terminal draws can be checked against more than a thousand days of history before anyone pays anything. Only the live intraday stream is behind the subscription.
Because you can check it before you buy it, and because it does not sell you a signal.
Every finished session is free and needs no account, so the flip, the walls and the hold band can be replayed against more than a thousand archived days first. Most tools in this category show you today's picture and ask you to take the method on trust.
And deliberately, there are no buy/sell calls. Directional edges were backtested across the whole archive three separate ways and none survived out of sample, so none are sold. What you get is a measurement of where dealer hedging pressure sits, with the method stated, plus a Lab that lets you backtest your own rule against the archive rather than trusting ours.
Traders and researchers who work the SPX index options market intraday, mostly 0DTE and near-dated: independent options traders, systematic and discretionary desks of one to a few people, and quant-minded retail who care where dealer hedging pressure sits rather than what someone thinks the market will do.
A second, growing group is people who reach it from an AI assistant. The MCP server exposes the same session data and the Lab to Claude, Cursor and other MCP clients, so an analyst can ask for a session's flip and walls, or run a backtest, without opening the terminal at all.
It is not built for buy-and-hold investors, and not for anyone looking for trade alerts — there are none.
We have collected here some useful links to help you find out if FirmTape is good.
Check the traffic stats of FirmTape on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of FirmTape on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of FirmTape's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of FirmTape on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about FirmTape on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is FirmTape good? This is an informative page that will help you find out. Moreover, you can review and discuss FirmTape here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
