As a backer: anybody, of any age or nationality, living anywhere in the world, can join and participate to Ulule.
To contribute to a project: it’s open to everyone!
As a project creator: to post a project and run a fundraising campaign, you have to be 18 years of age and you must live in a country using one of these currencies: €, $ (US, CAD etc.), ou £.
How much does it cost to join? Nothing. Nada. Zip. It's completely free to register, use the site and create projects.