Mint
From Feed The Beast Wiki
A mint is for making coins which can be used to trade with some villagers like how it's done with emeralds.
Coins can be made from right clicking on the mint with either a Bronze Ingot, which yields 1 coin, a Silver Ingot, which yields 3 coins, a Gold Ingot, which yields 9 coins, an Electrum Ingot, which yields thirteen coins, and a Platinum Ingot, which yields twenty-seven coins.
To do a press, you must give the mint a redstone pulse for each press.
A Mint Storage can be used to store ingots in and they will be directly put into the mint if it's placed by the mint.