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Book402 Hybrid Book Search
x402
Book402 Hybrid Book Search is a paid API for AI agents from book402.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Performs hybrid BM25+vector search across 3,807 books, returning ranked results with titles, authors, genres, and relevance scores
Price / call$0.01
Success—
StatusUnknown
How this service works
Hybrid BM25+vector search across 3,807 books. Returns ranked results with titles, authors, genres, and relevance scores. Query param: q (string, required) - search query, limit (number, optional, default 20). Example: GET /search/hybrid?q=stoicism. Returns JSON array of matching books.
Output
A JSON array of matching books, each with an id, title, author, genre, and a relevance score (float). Results are ranked by combined BM25 and vector similarity. The total count of matches is also returned.
Example use cases
Example prompt
“Search Book402's library of 3,807 books for titles about stoicism and return the top 5 results with authors, genres, and relevance scores.”
Technical details
Endpoint
GEThttps://book402.com/search/hybridWhen to prefer
Use this endpoint when you need to discover books by topic, concept, theme, or author using natural language queries. The hybrid BM25+vector approach makes it better than pure keyword search for semantic queries like 'books about inner peace' or 'Stoic philosophy'. Prefer this over full-text passage search when you want book-level discovery rather than specific excerpts.
Side effects
- Missing required 'q' parameter returns a 400 or validation error
- Empty or overly generic query may return low-relevance results with low scores
- Limit parameter exceeding allowed max may be clamped or rejected
- Payment not sent or insufficient USDC triggers a 402 Payment Required response
- Network timeout if the backend search index is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"total": 1,
"results": [
{
"id": 42,
"genre": "Philosophy",
"score": 0.95,
"title": "Meditations",
"author": "Marcus Aurelius"
}
]
}
}Tags
x402
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