You can use the search endpoint https://chapi.cloudhealthtech.com/api/search to pull internal asset IDs. These IDs are returned in the response by default.

For example, you can see in the below screenshot we can return a list of instances with their instance id, and name using https://chapi.cloudhealthtech.com/api/search?api_version=2&page=1&per_page=100&name=AwsInstance&fields=instance_id,name ...with the internal ID included by default: