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Synapse Book Search API
x402
Synapse Book Search API is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Search for books by title, author, or other criteria and retrieve metadata including ISBN, year, title, and author
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
Returns a JSON object containing an array of book records, each with fields: isbn (array of ISBN strings), year (publication year as integer), title (book title string), and author (author name string).
Example use cases
ISBN lookup for book purchase
“I need to find the ISBN for 'The Hitchhiker's Guide to the Galaxy' by Douglas Adams so I can order it.”
Publication year verification
“Can you look up when 'Ender's Game' by Orson Scott Card was originally published?”
Author bibliography search
“Search for books by Ursula K. Le Guin and give me a list with their titles, ISBNs, and publication years.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/book-search?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need quick, pay-per-call book metadata lookups without account registration or API keys. Ideal for agents that need bibliographic data (ISBN, author, year) on demand, paid in USDC on Base via x402 protocol, at $0.002 per query.
Side effects
- No books found matching the search query — empty results array returned
- Missing required query parameter causes 400 Bad Request
- Payment not included or insufficient causes 402 Payment Required response
- Rate limiting or server errors return 5xx status
- Ambiguous title or author name may return unrelated books
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"books": [
{
"isbn": [
"0439023521"
],
"year": 1965,
"title": "Dune",
"author": "Frank Herbert"
}
]
}
}Tags
x402
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