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Open Search – Crossref Scholarly Paper Search
x402
Open Search – Crossref Scholarly Paper Search is a paid API for AI agents from open-search.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Searches Crossref's scholarly database and returns title, DOI, publication year, venue, document type, and citation count for the best matching academic works.
Price / call$0.02
Success—
StatusUnknown
How this service works
Search scholarly works via Crossref: title, DOI link, year, venue, type and citation count for the best matches.
Output
Returns a list of up to 10 scholarly works from Crossref, each containing: title, DOI, canonical URL, publication year, venue (journal/conference), document type, citation count, and a source label. Also includes the original query string, total results count, source identifier, and optional summary or disclaimer fields.
Example use cases
Literature review for a research proposal
“Find me the top 10 most-cited academic papers on CRISPR gene editing — I need the title, DOI, publication year, journal name, and citation count for each so I can build a literature review.”
Fact-checking a citation
“Look up scholarly papers on Crossref matching 'attention is all you need' and return the DOI, year, and citation count — I want to verify the original transformer paper details.”
Discovering recent work in a niche field
“Search for academic papers about federated learning and differential privacy, return up to 8 results with title, venue, year, and how many times each has been cited.”
Technical details
Endpoint
GEThttps://open-search.x402tookit.com/search-papers?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need bibliographic metadata for academic and scholarly works — especially when DOIs, citation counts, publication venues, or document types are required. Prefer it over general web search when the user explicitly wants peer-reviewed literature, journal articles, conference papers, or Crossref-indexed content. Use the multi-source sibling endpoint instead if the user also wants Wikipedia, Hacker News, or Wikidata results in the same call.
Side effects
- Query string exceeds 200 characters — truncate or shorten the query
- Limit parameter outside 1–10 range — use a value between 1 and 10
- No results found for highly specific or obscure queries — broaden search terms
- Crossref upstream unavailability — degraded flag set to true with partial or empty results
- Payment not processed (x402 protocol failure) — request rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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