http://dev.bukkit.org/server-mods/gringotts/

I use Gringotts for econ and would love to see it supported. I like the idea of a "tangible" currency in Minecraft. The currency from mob kills could be placed directly into the player's inventory, be dropped by the kill, or go straight to their vault or really anything that would work would be great.

Thanks!

There is a Gringotts connector in Vault. As long as you have Gringotts registered as the currency provider via Vault, the support will be there.

If you've configured it properly, you should see this line in the sever.log:

14:40:26 [INFO] [ecoCreature] Found economy provider Gringotts