AviEconomy is an economy plugin from avi.pw. Adds a currency on your server; either use XP or database for keeping track of player balances. Also hands out salaries, permission-based. Supports sending balance to a UI as well. For casual users: 1632829296 - UI mod. You may also be using a plugin that is dependent on Uconomy, in these cases you can enable UconomyToAviEconomy.
CommandPermissionDescription
/balance, /bal, /moneybalanceSee your current balance (amount of in-server money).
/paypay/pay <player> <amount>
/apay, /adminpayapayPays a player with new money (which might also be called inflation).