The uRPS server has a currency, nominally named the 'Nipple' (affectionately known as 'Jennipples' after Jennifer Aniston and her constantly pokey friends).
Currency is gained from selling items at shops, and is used to buy items from shops, or to pay Admins and Mods for portals. Players can see how much they have at any time by using the command /money. Players begin the game with no Nipples. They will need to sell items at shops to gain them.