WEBPAGE LINK:

Gringotts

What does this plugin do:
Gringotts is an item-based economy (currency) plugin for the Bukkit Minecraft server platform.
Unlike earlier economy plugins, all currency value and money transactions are based on actual items in Minecraft, per default emeralds.
The goals are to add a greater level of immersion, a generally more Minecraft-like feeling, and in the case of a PvP environment, making the currency itself vulnerable to raiding.
If you put down a chest and place a sign on it with the words : [vault] (case sensitive) you'll be able to store your money to use on the server, without the need to have the physical money in your inventory.

Youtube Videos:
the commands:

User commands
/money
/money pay <amount> <player>
/money withdraw <amount>
/money deposit <amount>

Admin commands

/moneyadmin b <account>
/moneyadmin add <amount> <account>
/moneyadmin rm <amount>
/gringotts reload

the permissions:

No permissions needed.

are there any Plugins/mods required to use it:
can work on its own. However it has integration support for VAULT, Factions, Towny and world Guard plugins.

OTHER INFORMATION:
Player vaults
Place a sign above a container block, with [vault] written on the first line. If it was created correctly, the sign will display your name on the third line and you will receive a message that the vault has been created.

Faction vaults
Place a sign above a container block, with [faction vault] written on the first line. If it was created correctly, the sign will display your faction's tag on the third line and you will receive a message that the vault has been created.

Towny vaults
•To make a vault for your town: place a sign above a container block, with [town vault] written on the first line.
•To make a vault for your nation: place a sign above a container block, with [nation vault] written on the first line.
If it was created correctly, the sign will display your town's or nation's tag on the third line and you will receive a message that the vault has been created.