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Playground demo key · api.reefapi.com
post/mascus/v1/facets2 credits

The source's own live filter counts for a query: which makes, countries, regions, categories, conditions, advert types, accessories and emission levels have stock and how much of it. This is how you learn the exact spelling a filter wants (the source wants 'CAT', not 'Caterpillar', and region NAMES rather than codes) and how to split a query that is deeper than the 10,000-row retrievable ceiling. Every group says in `value_kind` whether its values are names, ISO codes or the source's own numeric property ids — the ids are what the filter takes, so they are published as they are rather than guessed at.

Working example
Parameters
request preview
curl -X POST https://api.reefapi.com/mascus/v1/facets \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"catalog":"construction","category":"excavators","market":"com"}'

Hit Send to run this endpoint live.

What you can run here, without an account

ReefAPI is one HTTP gateway to 438 live web-data APIs covering 2778 endpoints across 14 categories. Every endpoint answers with the same JSON envelope, so one integration reaches all of them. Each response reports what it cost and when the source was read.

No signup, no API key and no card are required to try an endpoint on this page. Anonymous calls run on a shared demo key, capped at 15 calls per hour per visitor. Pick an API, fill the parameters and the real response comes back from the live source, not from a canned sample. A free account lifts the cap and gives you 1,000 credits and your own key.

Browse every API in the catalog, read an endpoint's fields and example response in the docs, or see per-call credit costs on the pricing page.

Coverage by category

ecommerce191
classifieds99
media25
real-estate21
utilities19
developer-tools18
jobs17
reviews15
social12
travel9
finance5
other3
search-seo2
government2