SqueezeMetrics
squeezemetrics.com
Free daily charts of the Dark Index (DIX) and gamma exposure (GEX) for the S&P 500 from the firm that published both measures.
What it is
SqueezeMetrics is a small research shop known mainly for two market-wide indicators. The Dark Index (DIX) is a dollar-weighted measure of short volume in dark pools across S&P 500 components, used as a gauge of off-exchange buying. Gamma exposure (GEX) estimates, in dollars, how much option market makers must hedge; high GEX tends to go with quieter markets and low GEX with larger swings. The firm's free white papers (Short is Long, Gamma Exposure and The Implied Order Book) explain the methods.
For most traders the useful part is free: a public chart of DIX, GEX and the S&P 500 with 6-month, 2-year and full-history views, updated after each trading day. The same daily series can be downloaded as a CSV file, which makes it easy to pull into a spreadsheet or backtest.
The paid Data subscription is a different product aimed at professionals. It costs $720 a month and covers single-stock dark pool and gamma ratios for more than 4,500 NYSE and Nasdaq securities back to 2011, with spreadsheet downloads, API access, a research page and the Yacht Club datasets (NPD, VGR, GEX+ and a Sunday note). At the time of review the plan was marked closed and signup was by invitation only.
Key features
- Dark Index (DIX)
- Daily dollar-weighted dark pool short-volume ratio for S&P 500 components, charted against the index. Free.
- Gamma exposure (GEX)
- Daily dollar estimate of market maker hedging obligations for the S&P 500, shown on the same free chart.
- CSV history
- The daily DIX, GEX and S&P 500 close series is available as a downloadable CSV file.
- White papers
- Free papers explaining the short-volume, gamma exposure and implied order book methods behind the indicators.
- Data subscription
- Single-stock gamma and dark pool ratios for 4,500+ securities from 2011, with spreadsheets, API, PDF reports and a research page. Currently closed to new signups.
Pricing
| Plan | Price | What you get |
|---|---|---|
| Free chart | $0 | DIX, GEX and S&P 500 chart with daily updates and CSV history |
| Data | $720/mo | Single-stock data for 4,500+ securities since 2011, downloads, API, Yacht Club; marked closed |
Billing is month to month; paying annually by ACH or wire costs $8,640 with no discount. The Data plan was marked closed and signup was by invitation only when checked.
Free option: The public DIX and GEX chart for the S&P 500 with full history, updated daily after the close, plus the underlying daily data as a CSV download. No account needed.
Checked September 25, 2026 on squeezemetrics.com. Prices change; confirm on the provider's site before you subscribe.
Strengths
- The DIX and GEX series come from the firm that introduced them, with published methods
- Free chart and CSV history need no account
- Full daily history makes the series easy to test against your own data
- Plain, fast pages with no upsell on the free chart
Limitations
- The free data is a single market-wide series for the S&P 500, updated once a day, not intraday
- Single-stock data needs the $720-a-month Data plan, which was closed to new signups when checked
- No alerts, options flow feed, screener or mobile app
- The indicators describe positioning and hedging pressure; the site itself calls them forecasting inputs with no fixed meaning
Good fit for
- Traders who follow market-wide gamma and dark pool positioning as context for index trades
- Quants and hobbyists who want a free daily DIX and GEX history to test
- Readers who want to understand GEX from its original write-up
Look elsewhere if
- Traders who want intraday or single-stock gamma exposure; a paid GEX tool fits better
- Anyone looking for a real-time options flow feed
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SqueezeMetrics questions
Is SqueezeMetrics DIX free?
Yes. The DIX and GEX chart for the S&P 500 is public, needs no account and is updated daily; the daily series can also be downloaded as a CSV.
What is DIX?
The Dark Index is a dollar-weighted measure of short volume in dark pools across S&P 500 stocks. SqueezeMetrics describes higher readings as more bullish dark pool sentiment and lower readings as bearish or uncertain.
What does GEX mean on SqueezeMetrics?
Gamma exposure is a dollar estimate of how much option market makers must hedge as prices move. High GEX tends to dampen volatility; low or negative GEX tends to amplify it.
How much is the SqueezeMetrics subscription?
The Data plan is $720 a month, or $8,640 a year if paid by ACH or wire. When checked it was marked closed, with signup by invitation only.
Written from SqueezeMetrics's own website and documentation. All Trading Tools lists and compares tools; it does not recommend trades or give financial advice. Sources: squeezemetrics.com, squeezemetrics.com/monitor/dix, squeezemetrics.com/monitor/plans, squeezemetrics.com/monitor/benefits, squeezemetrics.com/monitor/signup, squeezemetrics.com/monitor/static/DIX.csv.