Is NiceHash free?

Could you please clarify for me, is the NiceHash platform free to use? I'm interested in exploring its services but I'm uncertain about any potential costs involved. Could you elaborate on whether there are any fees associated with using NiceHash, or if it offers a basic service without any charges? Additionally, if there are fees, could you provide some examples or an overview of the pricing structure? Thank you for your assistance in clarifying this matter.