Is FRAX free?

Excuse me, I have a question regarding the FRAX protocol. Could you please clarify whether FRAX is free to use or does it involve any costs? I'm interested in understanding the economics behind it and whether there are any associated fees that I should be aware of. I've been reading about its stablecoin design and it seems quite intriguing, but I want to make sure there aren't any hidden costs before I decide to engage with it. Could you enlighten me on this matter? Thank you for your time.