Looking at the tape across $SPY, $SPX, and $QQQ — flows are mixed but leaning defensive into the close. If you're running premium, watch gamma flip zones around 580 on $SPX. Dealers are short gamma above that level, which means volatility expands fast if we punch through. Below 575, they're long gamma, so chop gets tighter.
For directional plays, I'm watching $SPY 578 as the line. Above that, I'm looking at short-dated calls into next OPEX. Below it, I'm out or hedging with puts. $QQQ is laggin...