DISCLAIMER: I didnt make this mod. I just found this Mod on this Github Page and saw that noone has posted it yet, so i posted it.  

(IF THE ORIGINAL CREATOR WANTS THIS MOD REMOVED, I WILL REMOVE IT)

This Mod allows you to trade items using coins, These Coins come in 5 Variations, Standard Coin: 1, Golden Coin: 10 Emerald Coin: 100, Diamond Coin: 1000, 

and finally the most valueable Coin of them all: the Obsidian Coin. with a value of 10000. These Coins can be obtained by either slaying Monsters or Trading items for Money in an Trading Station, what's an Trading Station? The Trading Station provides a place to sell and buy items for Coins, you could pay in raw coins, OR get a "Universal Card" from an ATM. The ATM is a safe place to deposit and withdraw the currency youve earned on your Journey. And finally there's also the Vending Block, a way to safely sell your items to other Players. And if you do lose your "Universal Card", you can just go to a ATM and Scan yourself and get a new Card. For Credit to the Original Owner: Here's The  Original Mod