The world of the Aluriza is an extremely advanced civilization where everyone's needs are met, so there is no longer a need for "money". Prestige however, can be earned by those who go above and beyond to contribute positively to the society. For the Xeros that value being known or remembered, or for those who just want to contribute: if you do good things you gain Prestige, recognition and rewards for your efforts; you get your name known. There is still a drive to succeed, but for accomplishments, not cash.
Prestige is the main currency of Project Xero, and is used for most normal purposes on the website, such as purchasing general items. It would be obtained by completing prompts, submitting art, playing mini games, and more.