It's built on NEO. You can learn more about where to buy NRVE here. You don't need it to join. You'll need it to buy a niche, if you decide to do so. You can pay in USD, but there's a 15% surcharge. Otherwise, I'd recommend joining first and playing around on the platform for a month or two so you can learn the lay of the land. It's not like other social blogging platforms at all. You'll need to learn its unique way of organizing content. Once you do, I'm banking on the rewards being respectable.