Hi, I have been using NinjaTrader and TradeLink for some time to trade with TD Ameritrade. They don't work any more after I upgraded my account to portfolio margin account, which does not allow direct API access. As far as I know, their TOS does not support 3rd party connections, such as IB's TWS does. Anyone else have any experience with this? One of my friend suggests to have some software to mimic their web page in application. We need to monitor the network traffic to figure out the commands their web site sends out for each functionality. It's time consuming and costly, and the most not reliable once TD Ameritrade changes their web command. But as TOS does not support AT, it might the only way now. Forget about their pordigio, which does not fit my purpose. Also, is there any AT platform for Charles Shwab, eTrade and Scott Trade? Will the 'mimic' application work with them too? Appreciate your help.