Collected API
Book metadata API
for your app.
Match books by ISBN or title and author. Add descriptions, reading profiles and series details to your existing catalog.
Free preview. No API key needed.
What you can add.
ISBN matching
Connect your ISBNs and title-author records to the right book and edition.
Book descriptions
Add published descriptions to the book pages in your app or catalog.
Reading profiles
Let readers browse by genre, tone, pace, themes and reading demand.
Series details
Show recorded series memberships and a book’s position where known.
Try your own books.
Look up one title or ISBN, or check up to five CSV rows.
Integration and usage
Resolve a book with POST /v2/resolve, then fetch its record with GET /v2/works/{work_id}. Keep API keys on your server.
curl --request POST https://api.collectedreads.com/v2/resolve \
-H "Authorization: Bearer $COLLECTED_API_KEY" \
-H "Content-Type: application/json" \
-d '{"query":{"isbn":"9780142000656"}}'Coverage varies by title. Descriptions and profiles are AI-assisted and reviewed. Missing fields and uncertain matches are returned explicitly.
Commercial access, storage and reuse follow your approved terms. Cover images, stock levels and ebook files are outside the API.
Read the API documentation ↗API status ↗Use it in your product.
Access is by approval. Tell us what you’re building and how many books you need. No payment is collected at signup.