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Vextorium DOI Metadata Lookup
x402
Vextorium DOI Metadata Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-16).
Returns publication metadata (title, authors, journal, year, type, citation count, references, license, link, and APA citation) for a given DOI via Crossref.
Price / call$0.002
Success—
StatusUnknown
How this service works
Metadata of a publication by DOI (Crossref): title, authors, journal or publisher, year, type, citation count, references, license, link and an APA-formatted citation.
Output
A JSON object with the paper's DOI, title, list of authors, journal or publisher name, volume, issue, pages, publication year, document type, citation count, reference count, license URLs, link to the article, and a pre-formatted APA citation string. Fields may be null if Crossref does not have that data for the given DOI.
Example use cases
Auto-cite paper in research report
“I have a DOI for a paper I'm citing — 10.1016/j.cell.2022.03.040 — can you get the full APA citation and journal details so I can add it to my reference list?”
Check impact of a published article
“How many times has the paper with DOI 10.1126/science.abc1234 been cited, and what journal and year was it published in?”
Verify license and access info for a paper
“Can you look up DOI 10.1371/journal.pone.0123456 and tell me whether it's open access, who the authors are, and where I can find the full text?”
Technical details
Endpoint
POSThttps://api.vextorium.com/doi-info-pago?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need structured bibliographic metadata for a known DOI, especially when an APA-formatted citation, citation count, or license information is needed. It is ideal for academic writing assistance, research enrichment pipelines, or any workflow that needs to resolve a DOI to its full Crossref record. Prefer this over a generic web search when structured, machine-readable metadata is required.
Side effects
- DOI not found in Crossref — returns null fields or empty response
- Malformed or invalid DOI string — may return an error or null result
- Crossref rate limiting causing slow or failed response
- Some fields (e.g. license, references) may be null if the publisher has not deposited that metadata
- Non-journal content (datasets, preprints) may have incomplete metadata
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| doi | string |
Tags
x402
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