TipU offers two kinds of services:

1. An investment service that works kind of like delegation, except that you can ask for your funds back at any time.
2. An upvoting service, where you can send a specific amount in SBDs and easily double that amount on the strength of TipU's upvote.

I am not aware of any fund transfer interface service. But what I have experienced with TipU has all been quite profitable.