Creating an API limit and 'tollgating' it with RM Server
I have two questions. The first is trying to understand the feasibility of exposing a REST API that's limited to the # of calls (much like the free Server) using RM Server. For example, I can easily expose a Twitter keyword research tool with Server's API capabilities but how do I limit the calls? Is there a parameter I need to pass when creating the API in Server?
Second question. If I can limit these calls, I'd like to be able to integrate a tool that will allow external users to create accounts and pay a fee to get more API calls. Much like what Aylien does. Any suggestions on 3rd party tools or ideas on how to do this?