A few indicators I find useful are the
$NAAD - Nasdaq Advance/Decline Issues
$NAA50R - Nasdaq % of stocks above 50 day moving average
$NAA200R - Nasdaq % of stocks above 200 day moving average
$CPC - CBOE Total Options Put/Call Ratio
$CPCI - CBOE Index Put/Call Ratio
$CPCE - CBOE Equity Put/Call Ratio
$SKEW - CBOE SKEW Index
$NASI - Nasdaq McClellan Summation Index
here’s a few, Nasdaq is just an example, you can use any index of your preference obviously. I find value in relative-breadth indicators. Useful for any speculator.