This is a rather complicated question, althought you might not realise it ;) The obvious answwer would be - like it says on the website, Pro, Elite and VIP accs. But in practice special accounts for partners I bet can be counted as "pro accs" as well, right? Then there are +3 right there, if you want to recieve higher rebates, or want to have trades visible for clients etc.

And even from the pro accs, only one of them, VIP, is truly pro-level - in that it requires AT LEAST $100k in deposit to work. Other 2 types are just from $500. Nothing much pro about them, exept for max leverage (1:2k).