Most probably yes, but certainly it is nothing you would be officially advised to do since it is internal exchange format that can change or disappear at any time.
The live map is picking up caches in JSON format from (as you can see from the network tool in your browser)
http://project-gc.com/ajax/livemap.php
using POST request, for example
cmd=GetGeocachesWithinBoundingBox&boundingBox[]=16.6&boundingBox[]=49.2&boundingBox[]=16.7&boundingBox[]=49.3&page=0&filters={"excludeFound":"yes","excludeOwned":"yes","cacheTypes":["Earthcache","GPS Adventures Exhibit","Giga-Event Cache","Groundspeak Block Party","Groundspeak HQ","Groundspeak Lost and Found Celebration","Letterbox Hybrid","Locationless (Reverse) Cache","Lost and Found Event Cache","Mega-Event Cache","Multi-cache","Project APE Cache","Traditional Cache","Unknown Cache","Virtual Cache","Webcam Cache","Wherigo Cache"],"terrain":"1;4.5"}