Api monitoring .net

I am novice in Web API. Apologize if any question is not making sense.

I have several Web APIs developed in .NET and hosted on the same sever. These APIs are consumed by different applications. Here I wanted to monitor APIs. Monitoring includes:

1. How many applications are consuming my API?
2. How many hit counts to the API by different applications?
3. Is there any why we can restrict an application to access the application(ex. An application is given only 5 hits to the api per day)?

And also it would be helpful, if there are any tools available to do the same.

Thanks in advance