Are you referring to Device Status? If so @CBurkhead is correct and that call should be sufficient. If you are looking for availability statistics like if a device is up for 99% of a time period, then they don't have a specific call for that.
You can use the GET /networks/{networkId}/devices/{serial}/lossAndLatencyHistory endpoint to get the packet loss info for a time period. The inverse of that is close to availability (depending on the availability calc you are going for ).