$TIKI tells you where (bid or offer) the DJIA is trading at any time during RTH
$VOLD (up volume/down volume difference) tells you about aggregated order flow
You can watch (ES + 10*SPY) - (2*SPX) which is a basis spread (PREM).
For Nasdaq it's (NQ + 40*QQQ) - (2*NDX).
You can also price a front month synthetic index, e.g. (100*ES - 20*NQ) (synthetic ES).
This is a hedged index trade (overweight SPX with an NDX hedge), which is being monitored by countless volume/price algorithms. Heavy flows coming out of this trade.
Ultimately, if you want to get on top of, or understand flows, it's the US treasury market you need to learn.
$VOLD (up volume/down volume difference) tells you about aggregated order flow
You can watch (ES + 10*SPY) - (2*SPX) which is a basis spread (PREM).
For Nasdaq it's (NQ + 40*QQQ) - (2*NDX).
You can also price a front month synthetic index, e.g. (100*ES - 20*NQ) (synthetic ES).
This is a hedged index trade (overweight SPX with an NDX hedge), which is being monitored by countless volume/price algorithms. Heavy flows coming out of this trade.
Ultimately, if you want to get on top of, or understand flows, it's the US treasury market you need to learn.