The root service group exposes endpoints for handling trade level and data levels, also called (user or session) capabilities, which are important to understand when trading on instruments and/or when subscribing to data (e.g. prices or positions) using OpenAPI.
The root service group exposes a single endpoint for removing subscriptions across different subscription services.
The root service exposes endpoints for querying about which features are available, as well as subscribing to changes in feature availablity.
See the reference documentation for more details.