I am not sure if this has been made yet, but I would like to make a request for a plugin. So I have designed a bank with minecarts, and I have a complete banking system in my server. I would love it if the items that are stored in the minecarts gained interest. Here is my idea: Select a region, much like world guard and world edit. Then use an appropriate command to identify that region. Everytime a minecart enters that region the items in the minecart begins to collect interest. Have a command that allows to edit how fast an item collects interest in the minecart.