Afaik there isn't such a thing that will offer you a deposit rate and even if you see one it will be probably a scam.
There is though one project from cyprus for a bitcoin bank that i don't think that it's active yet.
Im sure there is somewhere deposit rate service because at the moment the only thing that is missing is deposit rate service and if there would be one i think it would be very successful because people need one
No it wouldn't be successful at all because people in this community are burnt multiple times from services that hold their coins.