Try any of 2778 endpoints — live.
Pick an endpoint, load a working example, tweak the params, and send — no signup to try. Results render the way the data deserves; raw JSON, headers & code are one tab away.
The shape of the catalogue in one request: World of Books' own three-level category tree with a record count on every node, plus the top authors, publishers, bindings, languages, product types, cosmetic conditions and price bands, and the live minimum, mean and maximum price. This is the resolver for `search` — it gives you the exact spellings the filters take ('Jk Rowling', 'Penguin Books Ltd', 'Non-Fiction Books > Lifestyle, Cooking and Leisure') so you never have to guess one. Narrow it with `query` or `category` to get the breakdown of a single search or a single branch. One honest caveat, measured and repeated in the response: these counts are index-wide while `search` runs behind the storefront's own hygiene rule, so a facet count is an upper bound on what a search will return (measured the same minute: in-stock facet 8,224,496, search total 7,173,373).
curl -X POST https://api.reefapi.com/worldofbooks/v1/categories \
-H "x-api-key: $REEF_KEY" \
-H "content-type: application/json" \
-d '{"market":"uk","top":"20"}'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
| ecommerce | 191 |
| classifieds | 99 |
| media | 25 |
| real-estate | 21 |
| utilities | 19 |
| developer-tools | 18 |
| jobs | 17 |
| reviews | 15 |
| social | 12 |
| travel | 9 |
| finance | 5 |
| other | 3 |
| search-seo | 2 |
| government | 2 |