Hi BeneBarros,
to test my
AppUpdating lib I did exactly that. Registered to a free hosting service (000webhost), then uploaded my apk and an html page containing a link (a href) to that apk. Using .htaccess you could even define free access folders and protected ones.
Note: as explained on Stackoverflow the result may depend on the server configuration; I recently found that 000webhost changed their config and now I can't directly link an apk anymore.
udg