Access Your Reserved Instance (RI) Coverage Information via the AWS Cost Explorer API
RI coverage tracks the number of running instance hours that are covered by RIs, which allows you to understand your RI coverage at a high level (e.g., across all running hours) or dive into detailed information by filtering for a particular set of accounts, instance types, regions, tags, and more. From there, you can use the insights gleaned from this data to optimize your RI purchases for cost efficiency (e.g., by identifying instance hours that are consistently running at on-demand rates and purchase matching RIs).
The AWS Cost Explorer API is a low-latency ad-hoc query service that gives you programmatic access to the AWS Cost Explorer dataset, which comprises your cost and usage data (including your cost allocation tags) as well as advanced metrics (e.g., Reserved Instance coverage and utilization).
To get started using the AWS Cost Explorer API, please access the Using the Cost Explorer API user guide or refer to the AWS Cost Explorer webpage.