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CrossRef DOI Scholarly Metadata Lookup
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CrossRef DOI Scholarly Metadata Lookup is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-15).
Retrieves scholarly metadata for a given DOI via CrossRef, including title, authors, journal, publication date, abstract, citation count, references, license, and URL.
Price / call$0.008
Success—
StatusUnknown
How this service works
Look up scholarly metadata for any DOI via CrossRef. Returns title, authors, journal, publication date, abstract, citation count, references, license, URL. Use ?doi=10.1038/nature12373. Built for AI research agents doing literature review and citation graph traversal. Accepts payment on Base or Solana — either network works.
Output
Returns structured scholarly metadata including paper title, author list, journal name, publication date, abstract text, citation count, reference list, license information, and canonical URL for the resolved DOI.
Example use cases
Example prompt
“Can you pull up the full metadata for the paper with DOI 10.1038/nature12373 — I need the title, authors, journal, abstract, citation count, and any references listed?”
Technical details
Endpoint
GEThttps://api.x402node.dev/citation/doiWhen to prefer
Use this endpoint when you need authoritative bibliographic metadata for a specific DOI, especially for literature review, citation graph traversal, or academic research workflows. Prefer over generic web search when you have a known DOI and need structured citation data from CrossRef's curated index.
Side effects
- DOI not found in CrossRef index — returns 404 or empty result
- Malformed DOI string — returns validation error
- CrossRef upstream timeout — returns 5xx or timeout error
- Paper exists but has incomplete metadata — some fields may be null or absent
- Rate limit or payment failure — returns 402 or 429
Input
{
"doi": "10.1038/nature12373"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"doi": "10.1038/nature12373",
"url": "https://doi.org/10.1038/nature12373",
"isbn": [],
"issn": [
"0028-0836",
"1476-4687"
],
"page": "54-58",
"type": "journal-article",
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"issue": "7460",
"title": "Nanometre-scale thermometry in a living cell",
"volume": "500",
"authors": [
{
"name": "G. Kucsko",
"given": "G.",
"family": "Kucsko",
"affiliation": []
},
{
"name": "P. C. Maurer",
"given": "P. C.",
"family": "Maurer",
"affiliation": []
},
{
"name": "N. Y. Yao",
"given": "N. Y.",
"family": "Yao",
"affiliation": []
},
{
"name": "M. Kubo",
"given": "M.",
"family": "Kubo",
"affiliation": []
},
{
"name": "H. J. Noh",
"given": "H. J.",
"family": "Noh",
"affiliation": []
},
{
"name": "P. K. Lo",
"given": "P. K.",
"family": "Lo",
"affiliation": []
},
{
"name": "H. Park",
"given": "H.",
"family": "Park",
"affiliation": []
},
{
"name": "M. D. Lukin",
"given": "M. D.",
"family": "Lukin",
"affiliation": []
}
],
"journal": "Nature",
"license": [
{
"url": "http://www.springer.com/tdm",
"start": "2013-07-31T00:00:00Z"
}
],
"subject": [],
"abstract": null,
"language": "en",
"subtitle": null,
"publisher": "Springer Science and Business Media LLC",
"online_date": "2013-7-31",
"published_date": "2013-7-31",
"references_count": 30,
"is_referenced_by_count": 1778
}Tags
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