AdvancedRegionMarket is a plugin for the Minecraft server API called Spigot. The plugin allows server admins to sell or rent in-game regions to players using in-game currency. To achieve this AdvancedRegionMarket integrates with WorldGuard which defines regions, WorldEdit which is used to restore regions and Vault which provides an API to communicate with in-game currency plugins.
Find more information about the plugin on its download page on SpigotMC.org