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Open Library Subject Book Search
x402
Open Library Subject Book Search is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns books (works) from Open Library tagged with a given subject, along with work counts and metadata, without requiring an API key.
Price / call$0.05
Success—
StatusUnknown
How this service works
Books for a subject from Open Library, no key. Returns works tagged with the subject plus counts. For AI agents discovering books by topic.
Output
Returns a list of works from Open Library tagged with the requested subject, including book titles, author information, and total work counts for that subject.
Example use cases
Research reading list by topic
“I'm putting together a reading list on climate change — can you pull up books tagged with that subject from Open Library and tell me how many works come up?”
Curriculum book discovery for educators
“I need to find books on the subject of linear algebra for a course I'm designing — can you search Open Library for works tagged with that topic?”
Personal interest book browsing
“I've been getting into stoic philosophy lately — can you find me books on that subject from Open Library and show me the results?”
Technical details
Endpoint
POSThttps://proxy.suverse.io/v1/data/suverse-openlibrary-subjectWhen to prefer
Choose this endpoint when you need keyless, no-authentication book discovery by topic from Open Library's large public catalog. Ideal for agents that need bibliographic data without managing API credentials, and when subject-level browsing (rather than title or author search) is the primary intent.
Side effects
- Subject not found or no works tagged — returns empty results or zero count
- Misspelled or ambiguous subject term yields irrelevant or no results
- Open Library upstream outage causes timeout or error response
- POST body missing required fields returns validation error
- Rate limiting or payment failure via x402 protocol blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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