A long time ago, I made an unpublished indicator that I thought could be used to gauge the current altcoin sentiment. It worked, but it was hard to read.
This indicator is the derivative of that indicator. When it's in the red, alt sentiment is about to turn bearish or is bearish. When it's green, it's about to turn bullish or is bullish. You can see how it predicted the end of the alt bull run in january, 2 days ahead of time. For KTS users, the alt sentiment overlay is driven by this study.
Only works on 1D timeframe.