Vendor prices and location data are static information, meaning it never changes, so these things can be hardcoded into different apps since there is no need to read from the game. It's very rare for any game to allow direct access from an external device. Most that offer an app do so through a web service anyone with an internet browser can access. Examples are Armory for WoW and Lodestone for FFXIV.
If you want to look for this kind of info, they're pretty much posted everywhere online, just search Google.
Last edited by SDPhantom : 08/06/18 at 11:01 AM.
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