Guild Permission
Yes, the key just needs the “guilds” permission. All of the APIs tied to it are read-only, so it should be safe.
http://gw2shinies.com/ – A Guild Wars 2 Trading Post Service
http://gw2tno.com/ – The Nameless Ones [TNO]
http://gw2tno.com/ – The Nameless Ones [TNO]
Web Programmer
Yes, the key just needs the “guilds” permission. All of the APIs tied to it are read-only, so it should be safe.
To add more to this — the “guilds” permission will never allow access to anything that isn’t already shown in the in-game guild panel, but it does allow you to access the info for all guilds that they’re a leader of (e.g., bank guild inventories).
(also, the “account” permission is always required, but it only really allows you to see account name, created date, etc, which shouldn’t be a big deal).