catalog.search answers from a shared cache of NHTSA vPIC models and fetches a make from vPIC at most once a month, falling back to the cache when vPIC is slow or down. vehicle.create adds a car from a Catalog Entry or flagged manual, with its first odometer reading in km and an optional cover photo from the direct upload flow; vehicle.update edits it or links it to the catalog. garage.list returns every car with its latest odometer and valuation, a short-lived signed cover URL, years owned and the count per state.
The Free plan holds one current vehicle (RN11); a save beyond it fails with the new PLAN_LIMIT error code. A deployment without billing enforces no limit.