Universal Coins Mod provides tools for you to trade any items using coins., which come in four values: the Coin (value 1), the Coin Stack (value 9), the Large Coin Stack (value 81) and the Coin Pile (value 729). Obviously, 9 of a lower tier will get you 1 of the higher tier; also 1 of a higher tier will get you 9 of the lower tier.

Detail and Download here : Universal Coins Mod 1.8.9/1.7.10

See also : Minecraft mods 1.8