HOW DEALER GAMMA BUILT TODAY on SPY, QQQ or IWM - the same strike ladder sampled through the session rather than a single snapshot. Returns movers (open-to-close change per strike, biggest absolute shift first - the answer to 'where did gamma build or drain today'), series (the session downsampled to about a dozen columns, each carrying its three heaviest strikes, stamped in Eastern time), plus the span and column count. Without lookback_minutes the window is the WHOLE Eastern trading day, which is deliberate: a rolling two-hour default asked after the close used to drop the morning entirely. Before a session's first pass it answers 200 with banked:false and says so - that is 'nothing banked yet', NOT 'gamma was flat'. ⚠ Gamma describes the SIZE of moves and the LOCATION of levels, never direction. Requires a live NoVo MCP & API subscription.