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Research Paper Checks – DOI Bibliographic Metadata
x402
Research Paper Checks – DOI Bibliographic Metadata is a paid API for AI agents from research-papers.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Fetches clean bibliographic metadata for a research paper by DOI from Crossref, including authors, journal, pages, publisher, license, and a formatted citation string.
Price / call$0.02
Success—
StatusUnknown
How this service works
Clean bibliographic metadata for a DOI from Crossref: authors, journal, pages, publisher, license, plus a ready citation string.
Output
Returns a structured object containing the DOI, title, authors (list), journal name, ISSN(s), volume, issue, pages, year, publisher, license, source URL, reference count, a formatted citation string, and metadata freshness timestamp. Fields may be null if not available from Crossref.
Example use cases
Citation formatting for a manuscript
“I'm writing a paper and need a properly formatted citation for DOI 10.1016/j.cell.2021.05.020 — can you get me the authors, journal, volume, pages, and a citation string I can paste in?”
Verifying paper publisher and license
“Before I reuse figures from this article, can you check DOI 10.1371/journal.pbio.3001333 and tell me who the publisher is and what the license is?”
Building a reference database entry
“I need to add a paper to my reference database — the DOI is 10.1126/science.abc1234. Can you fetch me all the bibliographic details including ISSN, volume, issue, pages, and year?”
Technical details
Endpoint
GEThttps://research-papers.x402tookit.com/doi-metadata?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need clean, structured bibliographic metadata for a specific paper and have its DOI. It is ideal for citation generation, reference database population, license checking, and author lookup. Prefer it over full paper profile endpoints when you only need core bibliographic fields rather than citation counts or impact metrics.
Side effects
- DOI not found in Crossref — returns null fields or error
- Malformed DOI string — request fails validation
- Crossref API unavailable — degraded flag set or timeout
- Partial metadata — some fields null if Crossref record is incomplete
- DOI exists but has no associated metadata (e.g. very new or obscure record)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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