If you are accessing Cost Explorer via API, then you will be billed for those API requests (Using cost explorer through the console is free). See -management/latest/userguide/ce-what-is.html and -cost-management/pricing/
If you are accessing Cost Explorer via API, then you will be billed for those API requests (Using cost explorer through the console is free). See -management/latest/userguide/ce-what-is.html and -cost-management/pricing/