CloudCosts uses the AWS Cost Explorer API to retrieve information about your AWS account costs. The Cost Explorer costs are as follows:
The AWS Cost Explorer API lets you directly access the interactive, ad-hoc query engine that powers AWS Cost Explorer. Each request will incur a cost of $.01. – Pricing.
CloudCosts only performs a sync of information once per day. Thereby resulting in a cost of around ~$.30 per month. As per the terms of service CloudCosts cannot guarantee that you will not have unexpected AWS costs however we take this matter very seriously and track systematically calls to services that may charge money strictly.
Google Cloud Charges
CloudCosts uses the Google Cloud billing report. There are no extra costs associated with using this service.