Does Curve charge a fee?

I'm curious about the fee structure of Curve. I understand that it's a popular platform for combining multiple crypto assets and maximizing yields, but I'm wondering if there's a fee associated with using their services. Could you clarify if Curve charges a fee and, if so, how much it typically is? It would be helpful to know if there are any additional costs or fees that I should be aware of before deciding to use Curve.