best way to gather statistics from web widget

Question

I have a web widget, which is basically a JS file that people
can reference to in their website and it does something cool lets say.

currently I'm gathering statistics by doing an AJAX request to some
dummy image file on my server, its like this:

http://www.myserver.com/image.png?views=120&openings=80&close=65

I monitor these hits to my server, and extract the data I need.

Is this the best way to do this?