Which service helps in monitoring the history of AWS API calls for an AWS account?

AWS CloudTrail is the service that monitors the history of AWS API calls for an AWS account. It provides detailed logs of all API calls made within the account, including information about the identity of the caller, time of the call, the source IP address, and the resources involved. This is crucial for various purposes such as security analysis, compliance verification, and troubleshooting operational issues.

By enabling CloudTrail, organizations can gain visibility into their AWS resource usage and manage their security posture effectively. It allows users to track changes and maintains a history of actions taken through AWS services, thereby facilitating audits and governance.

In contrast, other options serve different purposes. AWS Config is designed to assess, audit, and evaluate the configurations of AWS resources, while AWS Health provides information about the performance and availability of AWS services that may impact an account. AWS OpsWorks is a configuration management service for deploying applications, which does not focus on monitoring API calls but rather on application stack management. Thus, CloudTrail stands out as the dedicated tool for capturing and monitoring API call history in AWS accounts.