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Scholarly Paper Search via Crossref (150M+ Records)
x402
Scholarly Paper Search via Crossref (150M+ Records) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Searches over 150 million scholarly papers indexed in Crossref by keyword query, with optional result limit and year filter.
Price / call$0.003
Success—
StatusUnknown
How this service works
Scholarly paper search across 150M+ Crossref records — Genesis402 / UnyKorn Operator Network
Output
Returns a list of matching scholarly paper records from Crossref, each typically including title, authors, journal or venue, DOI, publication year, and available abstract or citation metadata, up to the specified limit (default 10, max 40).
Example use cases
Literature review for a research proposal
“Find me up to 30 peer-reviewed papers about CRISPR gene editing published since 2018 — I need titles, authors, and DOIs to build out my literature review.”
Tracking recent AI safety publications
“Search for the latest academic papers on AI alignment and safety — give me up to 15 results from 2022 onward so I can see what researchers have been publishing.”
Quick background check on a technical topic
“Pull up some scholarly papers on quantum error correction for me — maybe 10 results — so I can get a sense of the academic landscape before my meeting.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/research/paper-search?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need broad keyword-based discovery across 150M+ scholarly records indexed by Crossref, especially when you don't already have a DOI and want to explore a topic. Prefer it over DOI lookup (which requires an exact DOI) or Google Scholar scraping (which may lack structured metadata). Ideal for literature reviews, research scoping, and academic background research where structured citation metadata is needed.
Side effects
- Empty results if the query is too specific or uses non-standard terminology
- Rate limiting or payment failure if the x402 micropayment is not processed correctly
- Partial results if fewer than the requested limit exist in Crossref for the query
- Malformed request if required 'q' parameter is missing
- from_year filter may exclude relevant older foundational papers
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "crossref-search",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.003,
"receipt_id": "g402-<16hex>"
},
"sources": [
{
"ok": true,
"name": "<source>"
}
],
"limitations": "<text>",
"generated_at": "<iso time>",
"evidence_hash": "sha256:<64hex>"
}
}Tags
x402
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