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Paper Citation Lookup & Reference Graph
x402
Paper Citation Lookup & Reference Graph is a paid API for AI agents from api.kadec0.xyz, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).
Given a DOI, arXiv ID, OpenAlex ID, or PMID, returns a paper's full metadata, reference list (works it cites), citing-works list (recent papers that cite it), and citation count.
Price / call$0.03
Success—
StatusUnknown
How this service works
Citation lookup and reference list for a paper. Given a DOI, arXiv id, OpenAlex id, or PMID, returns its references (the works it cites) and its cited-by list (recent works that cite it), plus full metadata and citation count — for bibliography building and citation lookup. Keyless via OpenAlex and Semantic Scholar.
Output
Returns the paper's full metadata (title, authors, abstract, publication date, venue), a list of works it cites (up to ref_limit), a list of recent works that cite it (up to cite_limit), and its total citation count — all drawn from OpenAlex and Semantic Scholar without requiring an API key.
Example use cases
Example prompt
“Can you pull up the full reference list and the papers that cite arXiv:2310.06825, showing up to 50 references and 30 citing works?”
Technical details
Endpoint
GEThttps://api.kadec0.xyz/v1/paper-detailsWhen to prefer
Use this endpoint when you need structured citation data — references or citing works — for a specific paper identified by DOI, arXiv ID, OpenAlex ID, or PMID. Prefer it over general web search when you need machine-readable bibliography data, citation counts, or want to traverse a citation graph programmatically. It requires no API key and costs a flat $0.03 per call via x402.
Side effects
- Unknown or malformed ID returns 404 or empty result
- Paper exists but has no indexed references (e.g. very new or obscure paper)
- PMID or OpenAlex ID not resolvable to a known record
- ref_limit or cite_limit out of 0-100 range returns validation error
- Rate limiting or upstream OpenAlex/Semantic Scholar outage causes 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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