Is GMX free?

Could you please clarify for me, is GMX available without any cost? I'm interested in exploring its features and functionalities, but I'm also mindful of potential financial obligations. Is there any sign-up fee, monthly charge, or transaction cost associated with using GMX? It would be helpful to know if I can access and utilize it freely or if there are certain aspects that require payment. Thank you for your assistance in clarifying this matter.