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Some endpoints don’t query the source when you call. They answer from a complete copy of it that Croma keeps up to date and organized for querying: these are dataset endpoints. The rest are live lookups. A dataset endpoint:
  • answers in milliseconds and never becomes an async job,
  • keeps answering when the source is down or in maintenance,
  • searches everything the source has published, not one record per call,
  • spends 1 credit per request instead of the live 10 (see Rate limits).

as_of

Every dataset-served response carries as_of: the data is current up to that moment.
Each dataset refreshes on its own schedule. If you need the source’s answer as of this second, use a live endpoint where one exists.

Which endpoints are dataset-served?

The Dataset pill in each guide and served_from in the /catalog are always current.

Live lookups

The other answer mode: the source itself, queried at request time.