moneys galore - Coin Rain for Your World
This mod introduces a complete monetary system into Minecraft that can be used in both single-player and multiplayer servers. Money is represented as physical items that players can hold in their hands and use for various transactions.
The mod works particularly well with the Simply Shops plugin, creating a full-fledged economic ecosystem. You'll be able to organize shops, set prices, and conduct trade between players.
Additional feature: currency can be integrated into adventure maps through commands, for example, by setting up villager trading for in-game money instead of standard emeralds.