Does it work like cryptocurrnecy tumblers? If yes, wouldn't it be hard for you to establish your project because you can almost do the same with those tumblers, and what makes yours unique from the other.
How do you plan to get an income from this because it looks like it is only a bridge for anonymous payments, do you get commisions or are you putting ads, cause that helps a lot.
One last thing I can think of is how can the receiver get the payment when there are no sign up, this might be a problem in the long run because there can be mix-ups, I hope you can put a unique identifier for receiving payments like two way encryption where the sender and the receiver carries one key and the payment will never be valid when there is no activation from the both parties.