In theory one could autotrade by setting up a simulated system at C2 and autotrading from it. You would also get published independently verified results visible to the internet world (if that is your thing).
Expensive though - approx. $200 per year for C2 system + $50 per month for TradeBullet.
From the description on the website I think this satisifies most of the auto trade requirements and it is a one time fee versus a monthly fee. Has anyone tried it?