Subfields API — Overview - Hexagraph

Subfields represent specialized research disciplines within a field of study. They sit below fields in the Hexagraph research hierarchy and group together closely related research topics.

Filter and Sort Fields

The API supports filtering, sorting, and grouping operations on these fields:

Field	Sort	Filter
`id`	✓	✓
`name`	✓
`outputs_count`	✓	✓
`cited_by_count`	✓	✓
`field.id`	✓	✓
`domain.id`	✓	✓
`topics.id`	✓	✓

Available REST Endpoints

Get a single subfield: GET /subfields/{id} — Fetch details for a single subfield.
List subfields: GET /subfields — Retrieve all specialized research subfields.