PPC for link forwarding service

I have a link forwarding service that shares any URL to Facebook. And I'm wondering if there are any ways to monetize on the transaction. I'm sending a boatload of traffic through the service and it basically connects any URl to Facebook and there is no user interface. It's all backend.

Are there any PPC services that work on the backend. I don't want to display anything to the end user on the front-end. It should all be managed in the re-direct.