How good is IB for fulltime intraday scalpers like me ? I only do index option (banknifty/finnifty/nifty) buying (with large quantity) and barely hold the trade more than few minutes, IB must be hell lot robust n rock solid when compared to any of the Indian broker. What are their charges for intraday, I could only find the following calculator https://www.adigitalblogger.com/interactive-brokers-brokerage-calculator/ to see the IB charges, are they accurate ? Do IB provide access to API ? if yes then at what cost ? can I manually trail SL beyond avg/buy price with a click of a mouse/keyboard in IB web platform itself ?