Monitis will be making API calls on your behalf when polling your AWS account for retrieving CloudWatch metrics. These API calls are charged for by Amazon (https://aws.amazon.com/cloudwatch/pricing/).
Amazon charges a fee (currently $0.01 per 1,000 GetMetricStatistics, ListMetrics, or PutMetricData requests) for CloudWatch API access above 1 million requests/month. These charges are billed to the account associated with the credentials you provide to us when integrating CloudWatch with Monitis. Currently we poll the AWS services every 5 minutes and make one API call for each metric instance that we retrieve from CloudWatch into your Monitis account.