Can you sell things for free on Gumroad?

Excuse me, I'm a bit confused about the workings of Gumroad. Is it actually possible to sell items for absolutely no cost on this platform? I mean, isn't the entire premise of online marketplaces to facilitate transactions where money changes hands? Or does Gumroad offer some unique feature that allows creators to give away their work for free, while still leveraging the platform's reach and tools? I'd appreciate it if you could clarify this for me.