Free-text catalogue search that also answers 'how much is X' for a single item. With city, near or location every hit carries fromPrice and normalizedUnitPrice and the list comes back cheapest per unit first; without one those fields are absent and the order is by relevance. For a whole shopping list use POST /v1/delivery/optimize instead: these prices sit at different storefronts and each carries its own delivery fee, so they must not be summed.

Requires something to search for: at least one of q, category, brand or gtin. The other parameters narrow a result set rather than choosing one, so a call carrying only those is answered 400 instead of with an arbitrary page of the catalogue.