How to use reflection to identify sections of code that are hitting REST services

I have a fairly robust REST API that is being consumed by a variety of intranet applications. The REST service and consuming applications are all written in .Net. Framework versions vary a bit, but the majority of the code is 4.5.2.

Is there any tools I can use to look through a solution and find the places where my applications are calling my service. The goal is to be able to know which applications need to be updated/tested given a change to a specific section of the API.

I feel like I can do this with reSharpers 'Find usages', but I need to do it in a way where it loops through say all the methods in a namespace rather than doing each individual method.