MCEconomy3
MCEconomy3 is an economy API for Minecraft version 1.10.2 that introduces the concept of money into the game world.
Main Features
The modification displays the amount of money directly on the game screen as a HUD element, and also shows item prices in tooltips when hovering the cursor.
It's important to note that this mod does not add new items or crafting recipes - it serves exclusively as a foundation for economic systems.
Visual Representation

The economy system displays the player's current balance in monetary units (mp) in the interface.

When hovering over items, their cost in the economic system is shown.

The mod provides developers with a simple shop system for integration into their projects.
For Developers
The project's source code is available for study and modification by developers who want to create their own economic systems based on this API.