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Playground demo key · api.reefapi.com
post/books/v1/ebook1 credit

public-domain full-text (Gutenberg via Gutendex): query OR id=Gutenberg-id OR ids=batch; filters languages/topic/sort; returns formats{epub/txt/html/kindle/cover}+download_url+read_url; gutenberg.org OPDS fallback when gutendex is down

Working example
Parameters
⌘↵
request preview
curl -X POST https://api.reefapi.com/books/v1/ebook \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"id":"1342"}'

Hit Send (or ⌘↵) to run this endpoint live.