I don't think I saw one, but I'd find a bank to be very helpful in this game. You know a place where you could store crowns and they'd gain interest over a period of time (two to three days). And if necessary you could put a cap on the amount of crowns you can actually deposit, so people don't break the interest system. It could also be used in a guild hall, and have shared bank space where you could deposit minerals, recipes, crowns, and items. The guild hall does look kinda barren.
What do you guys think? c:
I don't expect an interest-paying bank for crowns to be added - we already have a major problem with inflation resulting from there being too few things taking crowns out of the economy, and don't really need anything putting more of them into it.
The idea of a guild bank has been suggested before. No response from the devs as yet, though it is a very good idea (along with many other good suggestions to turn guilds into something other than an extended friends list).