Viper Economy

Players hold a numeric virtual balance per account, and physical items such as diamonds can be set as a currency that converts into that balance. The shop is a server-side GUI with categories, pagination and per-item buy and sell prices. Clicks buy or sell one item or a full stack, and a purchase tax can be configured. Entries can also run console commands, so a purchase can grant a LuckPerms rank, claim blocks or a kit without handing over an item.

A chest can be placed as a single or double unit, and a wall sign then defines its stock and price; the owner's claim keeps other players from opening it. Standing signs work as well. Players can pay each other, check a leaderboard of balances and check the price of the item they hold. New accounts receive a configured starting balance, and a daily cap limits how much a player can earn by selling, which slows inflation. The mod is server-side only: vanilla clients join and use everything it offers, and it works in singleplayer. Balances are saved to disk and on server shutdown. Storage can use several database drivers, and Redis can sync data across servers.