history(entity) — the CHEAP INDEX of one entity's dates (the place across time). entity_type deposit|infrastructure|company| project + id. Returns: frames — the imagery index over its coordinates (scene dates, cloud cover, scene ids, counts by year; NO images — fetch stills with look_at or a stack with look_through, the paid calls); snapshots — our record of the row since record time began (2026-10-03 19:29Z: versions with the fields that changed; before that "not recorded online"); what_changed — a short newest-first list (relationship began / ended with its basis, first stated by a source, capacity periods, events naming the company, our actions on the row, dataset releases matched), every item time_is "world" (a date a source states) or "ours" (when we acted). Nothing inferred. place = the entity's place block: has_site, height_class (its last measurement's, else unknown), last_measured, and the measurement routes filled in for it (entity.change, entity.state, look.through, site.reconstruction, place.index). WHEN NOT TO CALL: what changed physically between two dates is entity_change; ownership is relationships. AUTH: an agent key; browser sessions follow the graph-read rule. SIDE EFFECTS: none beyond the charge — read-only. ⚠ CHARGING: one price at the basic class (look_from's price); an entity that does not exist is a 404 and costs nothing; quote with billing_quote("/api/v1/entity.history"). NOT the account's own query history (that is a different route).