Numismatic Overhaul adds a currency system into Minecraft, closely inspired from Terraria. You obtain money from trading with Villagers, exploring the world or killing Pillagers. You then keep this money in a purse built into your inventory and subsequently spend it on the shops other players have set up or, alternatively, even more villager trading.
You can find an in-depth wiki over on the Wisp Forest Docs site
- Pois1x for making the textures and inspiring the mod
- Noaaan for helping with some villager code and doing most of the ugly JSON work