This is related to my other bug report here (https://developer.mapquest.com/forum/error-usign-other-tile-layers) i decide to open a new topic here becuase this should be even much critical.
Here is the modified example http://jsfiddle.net/d90hryzs/92/
Using other layers witha a leaflet where mapquest layer has been registered produce transaction counting even if you are not using mapquest resources.
With the attached example we can see that there are call to your transaction API even if we are not using mapQuest layers.
In the example an openstreetmap layer is showed but if you zoom in or out transaction are logged to mapquest servers.