$SPX a similar set up today in the 2865/70 and 2870/75 SHORT PUT SPREADS, like on Fri with the 2855's. When I see  volume in put spreads stand out like this mid-day, I find it often points to where the close will be driven above EOD. 
IF get a dip to short these for $3+ credit. https://t.co/SyP8diDx65