GET /countries

Your OpenAlex API key (required). Get a free key at https://openalex.org/settings/api

Cursor for deep pagination. Use `cursor=*` to start, then use the `next_cursor` from the response.

Filter countries. Examples: `id:US`, `works_count:>1000000` See [all Country fields](/api-reference/countries#available-filter-sort-and-group_by-fields).

Group results by a field and return counts. Available fields vary by entity type. See [all Country fields](/api-reference/countries#available-filter-sort-and-group_by-fields).

Page number for pagination. Use cursor for deep pagination beyond 10,000 results.

Constraints: {'minimum': 1}

Number of results per page (1-100, default 25)

Constraints: {'minimum': 1, 'maximum': 100}

Return a random sample of N results (max 10,000). Cannot be used with sort or page.

Constraints: {'maximum': 10000}

Full-text search across titles, abstracts, and other text fields. Example: `search=machine learning`

Comma-separated list of fields to return. Reduces response size. Example: `select=id,display_name,cited_by_count`

Sort by: `works_count`, `cited_by_count`. Prefix with `-` for descending. See [all Country fields](/api-reference/countries#available-filter-sort-and-group_by-fields).