I am trying to get familiar with MapProxy. I was able to install and start the demo page as well as the OpenStreetMap configuration from here: http://wiki.openstreetmap.org/wiki/MapProxy
I am curious now about other sources, such as Bing Maps. Unfortunately I am not able to find the source URL of this service (like http://c.tile.openstreetmap.org/%(tms_path)s.%(format)s for OpenStreetMap).
I can figure out the domain name by evaluating the get calls in the browser when using Bing Maps. But all the parameters after the domain name are a riddle to me.
Is there a page that shows such sources of different web map services or are they maybe not even communicated?