Numismatic Overhaul Wiki & Guide
wiki.9minecraft.net/numismatic-overhaul-9minecraft-mod/
How the three-coin currency works, what the purse does, and how to earn, store and spend money — including running your own shop and reading the rewritten villager prices.
Overview
Vanilla trading runs on a single green gem. One emerald buys a loaf of bread and one emerald buys a diamond pickaxe, so prices never really mean anything and a villager hall turns into a pile of identical stacks.
This mod swaps that for real money. Three coins of different worth circulate, villagers quote their prices in them, mobs and loot chests hand them out, and you carry a running balance instead of stacks of change. On top of that you can set up a shop of your own and let other players buy from it while you are away.