Gutendex
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Searchable metadata for 79,000+ Project Gutenberg ebooks: titles, authors, subjects and download links.
Example request
curl -s -A 'WildAPIsResearch/0.1 (+https://wildapis.com)' 'https://gutendex.com/books/?ids=1342'
Free tier, in plain English
No key and no published rate limit on the public demo instance; docs suggest self-hosting the open-source server for heavy or long-term use.
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