Free-text agency name.

1-based page number, 1 to 30000. start is (page - 1) x rows, so the deepest offset this reaches is (30000 - 1) x rows — beyond the entire measured inventory (556,435 listings, 244,746 agencies) at the default rows of 20. That inventory is not reachable at every rows value: past the ceiling with rows still on the table, matches remain behind the client, and the response then says so under next.page_ceiling_reached. A page beyond the ceiling is refused with a 422 rather than sent upstream.

Agencies per page, 1 to 50. Default 20.