I was trading Hangseng futures. volume was very good ie rather high. Too bad I was unable to switch to another broker fast enough. well ... I know what to do next time.
%% That logical to moniter the underlying stock/ETFs, SPY. BUT the old floor traders say ''no such thing as a cheap option'' NOW it sounds like a trader error, on SPY; and writing errors , as original question concerns options. IBKR has,as a matter of public record ,sold thier option market making business . BUT good fill on near SPY lows yesterday. Easy to make mistakes i checked the chart+ SPY has not even traded that low today,OOPs; but did yesterday as Frontyard noted