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OnchainExpat x402 Books Search API
x402
OnchainExpat x402 Books Search API is a paid API for AI agents from x402.onchainexpat.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Search for books by title, author, or keyword using a pay-per-request x402-gated endpoint
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-request AI, crypto, proxy, and utility APIs using x402 protocol
Output
Returns a JSON array of book results matching the query, including metadata such as title, author, description, and potentially cover images or other book details.
Example use cases
Building a crypto reader's personal library
“Find me all the books about blockchain and cryptocurrency so I can build a reading list for understanding Web3 better.”
Research assistant for academic papers
“Search for books by author Satoshi Nakamoto and anything else about Bitcoin's origins and early cryptography work.”
Genre-based book discovery engine
“Look up science fiction novels and dystopian books so I can recommend them to my book club members.”
Technical details
Endpoint
POSThttps://x402.onchainexpat.com/api/x402-tools/books/searchWhen to prefer
Use this endpoint when you need to search a book catalog by title, author, or keyword in a pay-per-use model via x402 micropayment protocol, especially when building crypto-native or agent-driven reading or research workflows.
Side effects
- Payment not provided or insufficient — 402 Payment Required response
- Invalid or missing search query — 400 Bad Request
- No books found matching the query — empty results array
- Upstream book data source unavailable — 503 or 500 error
- Rate limiting or quota exceeded — 429 Too Many Requests
Input
{
"query": "artificial intelligence"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | integer | Max results (default 10, max 50) |
| queryrequired | string | Book search by title, author, or ISBN. Alias: 'q' |
Output
{
"books": [
{
"isbn": null,
"title": "Artificial intelligence",
"author": "Stuart J. Russell",
"authors": [
"Stuart J. Russell",
"Peter Norvig"
],
"subject": [],
"language": "ger",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/92018-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/92018-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/92018-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL2896994W",
"first_publish_year": 1994
},
{
"isbn": null,
"title": "Artificial intelligence",
"author": "Patrick Henry Winston",
"authors": [
"Patrick Henry Winston"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/135105-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/135105-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/135105-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL2024373W",
"first_publish_year": 1977
},
{
"isbn": null,
"title": "Artificial intelligence",
"author": "Elaine A. Rich",
"authors": [
"Elaine A. Rich"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/55159-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/55159-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/55159-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL4453349W",
"first_publish_year": 1983
},
{
"isbn": null,
"title": "Life 3.0",
"author": "Max Tegmark",
"authors": [
"Max Tegmark"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/10239283-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/10239283-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/10239283-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL19717530W",
"first_publish_year": 2017
},
{
"isbn": null,
"title": "Artificial Intelligence and Intelligent Systems",
"author": "N. P. Padhy",
"authors": [
"N. P. Padhy"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/128294-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/128294-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/128294-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL5878924W",
"first_publish_year": 2005
},
{
"isbn": null,
"title": "Artificial Intelligence",
"author": "Melanie Mitchell",
"authors": [
"Melanie Mitchell"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/9333846-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/9333846-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/9333846-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL20666330W",
"first_publish_year": 2019
},
{
"isbn": null,
"title": "Human Compatible",
"author": "Stuart J. Russell",
"authors": [
"Stuart J. Russell"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/11264186-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/11264186-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/11264186-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL20492448W",
"first_publish_year": 2019
},
{
"isbn": null,
"title": "Understanding Artificial Intelligence",
"author": "Henry C. Mishkoff",
"authors": [
"Henry C. Mishkoff"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/6572294-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/6572294-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/6572294-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL15155081W",
"first_publish_year": 1985
},
{
"isbn": null,
"title": "Artificial intelligence",
"author": "George F. Luger",
"authors": [
"George F. Luger",
"LUGER",
"Stubblefield",
"William A. Stubblefield"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/2384072-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/2384072-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/2384072-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL2710037W",
"first_publish_year": 1992
},
{
"isbn": null,
"title": "Artificial Intelligence and Soft Computing",
"author": "Leszek Rutkowski",
"authors": [
"Leszek Rutkowski"
],
"subject": [],
"language": "eng",
"publisher": null,
"cover_large": "https://covers.openlibrary.org/b/id/8619487-L.jpg",
"cover_small": "https://covers.openlibrary.org/b/id/8619487-S.jpg",
"cover_medium": "https://covers.openlibrary.org/b/id/8619487-M.jpg",
"number_of_pages": null,
"open_library_url": "https://openlibrary.org/works/OL19827983W",
"first_publish_year": 2012
}
],
"count": 10,
"query": "artificial intelligence",
"cached": false,
"total_results": 22356
}Schema · Response
| Field | Type | Description |
|---|---|---|
| books | array | |
| count | integer | |
| query | string | |
| cached | boolean | |
| total_results | integer |
Tags
x402
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