Web traffic analytics - urls

Is there any tool/add-on in Cloudflare which would enable us in tracking down specific URL hits? We would like to set up billing for our customers based on successful API requests (HTTP/200 OK) .

For instance:

/service-a/params/param1/param2

param1&param2 are defined by the customers and they are going to be dynamic, so we would like to have some very reliable insight to number of successful requests for /service-a/*.