# Understanding API State

There are 3 types of API State:

1. Deactivated
   When API in deactivated state, it means the API no longer in service. All transaction made through this API will be denied.

2. Device API
   When API in device API state, it means the API is only available for IoT devices transactions. You can’t use device API for app transactions.

3. App API
   When API in app API state, it means the API is only available for apps transactions. You can’t use app API for device transactions.