Segments are the saved condition sets used to target contacts, either from an automation (seriesid) or from a list. This endpoint returns the segment records themselves, not the contacts that match them.

The collection is read-only and currently supports pagination only: filters[...] and orders[...] are accepted but have no effect, the segment conditions are not included, and the lists a segment is associated with cannot be requested or sideloaded with include. Segment conditions are managed in the application only.