Only thing I can think of that is something that comes close to this is a website or forum that has a trading game in which its members (if they want) participate in the game. Without the game format...it would be extremely difficult for someone to monitor the performance records of its members with accuracy especially if some members only report numbers when they are profitable while ignoring to report info on losing days. Also, I know a private chat room that tracks the realtime trade posts of its members and maintains a performance record of such trade posts... Not sure how the moderators have the time to do such...seems like a tremendous amount of work. NihabaAshi