SPDR S&P 500 (SPY)

[DowDeva]

Here's Squeezemetric's site. I check that every day too, and the dark pool index and the gamma stuff is free. Read the white paper - it's terrific - then check out 'The Dark Index' section.

Over 40% on DIX (dark pool activity) is bullish.

Over 0 billion on GEX is bullish; i.e., it keeps a floor under the bid on the market and suppresses volatility. Some sites have for free the '0' price flip point - where volatility gets intense - and remember, the flip point is not the holy grail. It's just a guideline.

http://stocks.tradingvolatility.net/gexDashboard

Since knowledge of gamma has become so widespread in recent years among retail traders the bots have begun to change tactics and and even with those above criteria on the bull side things can get pretty whippy.

But still, good to know.