InterestVault

Turn ordinary barrels into interest-bearing vaults: deposit an item and it compounds every Minecraft day. Three flavors teach the full arc from saving to investing to getting scammed - a hands-on money lesson for a family or community server.

Three vault types (the recipe trim picks the type)

Vault	Trim	Behavior
Savings	wood slabs	Fixed growth, compounds, never loses.
Stock	gold ingots	Volatile daily returns; red days remove items; rare market-wide crashes.
Hot Tip	gold blocks	"Guaranteed" absurd returns that periodically collapse to zero. The scam lesson.

Features

• Per-deposit lots (like tax lots) reward dollar-cost averaging.

• Floating holograms show each vault's live balance (no resource pack needed).

• Every player gets an in-game Vault Investor's Handbook.

• One-switch difficulty: realistic / fun / crazy / custom, changeable live with /ibvault mode.

• Fully configurable rates, growable items, and recipes.

Install

Drop the jar into your server's plugins/ folder, restart the server fully (not /reload), then craft a barrel with the item to grow in the center and the trim that picks the type.

Requires a Paper-based server (1.21+). Source and docs: https://github.com/SourceCodeMan/interestvault - MIT licensed.