Quote from stock777:
Steve, what about the cancel issue? If I display a bid or offer on the penny system, and and pull it before its taken, is there any fee for that?
From your description , if I execute against a displayed penny bid/offer it should trade, so the cancel fee is not much of an issue there.
Cancel fees are still applied as standard.
If you execute against a displayed penny bid/offer then it "should trade" - but not guaranteed as it will still need to go to the exchange to execute.