Simcraft - Economy

I’ve built a server-authoritative currency system for multiplayer Minecraft servers.


Coins are numeric, stored per player server-side (can’t be spoofed client-side).

Admins define exchange rates

• It works with weird denomination sets where greedy would fail
• It uses what the player actually has
• Players can exchange items into coins using a smart bounded knapsack solver
• It gets as close as possible to the requested value without going over
• Players can pay each other, and admins can mint coins.
• Rates are world-persistent, viewable by players, removable by admins, and now hardened to avoid legacy ID issues.

Commands

Admin / OP Commands (Requires Permission Level 2)

Command	Syntax	Expected Result
Quick Set (Hand)	/coinhand [value]	If value is empty: identifying the item ID in your hand. If value is set: Sets the exchange rate for the item currently in your main hand. Useful for mod items with complex IDs.
Set Rate	/coinrate <id> <val>	Sets the value of a specific item ID manually. Fix Applied: Case-insensitive. simcraft:Silver now automatically becomes simcraft:silver.
Unset Rate	/coinrateunset <id>	Removes the exchange rate for a specific item. Example: /coinrateunset minecraft:dirt
Mint Coins	/mintcoins <player> <val>	Creates new coins out of thin air and adds them to the target player's balance.

Command	Syntax	Expected Result
Check Balance	/coins	Displays your current coin balance (e.g., Coins: 150
View Rates	/coinrates	Lists all active exchange rates configured on the server. Sorted by value (highest first).
Search Items	/coinsearch <text>	Searches the internal item registry for matches. Cross-Mod Example: /coinsearch silver will now list simcraft:silver_ingot, simcraft:silver_nugget, etc.
Pay Player	/pay <player> <amount>	Transfers coins from your balance to theirs. Fails if you don't have enough coins.
Exchange	/exchange <amount>	Calculates the best combination of items in your inventory to equal <amount> coins, removes them, and credits you. Returns change if exact change isn't possible.

Simcraft Economy is a flexible, server-authoritative economy mod built for real multiplayer servers — not singleplayer toys.


Define any item (vanilla or modded) as a denomination, set its value, and let players exchange inventory items into coins using an optimal “closest-without-overpaying” exchange algorithm. No fixed “one item = one trade” nonsense. No client spoofing. Just clean, configurable money for modpacks and survival servers.


Perfect for:

• SMP economies
• modpacks with custom materials
• trading hubs and towns
• quest / shop / salary systems
• automation + economy servers

Highlights



✅ Cross-mod support


✅ Server-authoritative balances


✅ Smart exchange picks the best combo from your inventory


✅ Player payments + admin minting


✅ Rates are persistent + viewable in-game