Does any other broker offer a best ECN feature like IB? I realize that some Real Tick brokers have an ARCA option that allows you to trade with ECNs only. This is all I'm looking for: Type in a stock in your level 2 box. Click on the price you're willing to pay, and indicate the number of shares you want. Have the software get your shares, whether it's from ISLD, INCA, REDI or whatever. Instantaneously, of course. I don't know why I can't find a broker that offers this. I just assumed that Graybox would offer this, but their order routing options don't quite cut it.