Is SuperRare free?

I'm curious about the costs associated with SuperRare. Could you clarify if SuperRare is a free platform? Are there any upfront fees or ongoing charges for users to participate in the marketplace? I've heard it's a hub for digital art collectors and creators, but I'm wondering if there's a financial barrier to entry. If not free, could you outline the typical costs one might encounter in using SuperRare? It would be helpful to understand the financial implications before diving into this exciting digital art space.