The Vonage Reports API provides access to detailed data about activity on an account, including cost, delivery status, country, network provider, message body, and more. The API covers various products such as SMS, Voice, Verify, Number Insight, Messages, Conversations, and Automated Speech Recognition usage. It offers two types of requests: synchronous for frequent and periodic retrieval of smaller batches of data, and asynchronous for infrequent, large queries returning tens of millions of records. The API can be used to gather data for big data type applications such as data visualization, analysis, and testing outbound campaigns. With the reports, users can gain insights into traffic trends, issues, or fraudulent cost spikes on a large scale, and provide in-depth analytics to customers on their activity via sub-accounts.