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Rotary Agency CrossRef Lookup
x402
Rotary Agency CrossRef Lookup is a paid API for AI agents from rotaryagency.uk, paid per call via x402, $0.002/call, status down (last checked 2026-10-23).
Proxies the CrossRef API to retrieve scholarly metadata for publications, journals, and DOIs via a paid-per-call endpoint
Price / call$0.002
Success—
StatusDown
How this service works
Free-source data APIs (100% margin, no proxy, $0.002/call): ...
Output
Returns a structured JSON object from CrossRef containing bibliographic metadata such as DOI, title, authors, journal name, ISSN, publisher, publication date, abstract, citation count, and related identifiers, formatted as CrossRef's standard work record.
Example use cases
Resolving DOI to full citation
“I have this DOI — 10.1016/j.cell.2020.02.058 — can you pull the full bibliographic details from CrossRef, including title, authors, journal, and publication date?”
Finding papers by an author
“Search CrossRef for recent publications by the author 'Jane Smith' affiliated with MIT and give me a list of their papers with DOIs and publication years.”
Verifying journal metadata by ISSN
“Can you look up the journal with ISSN 1476-4687 on CrossRef and tell me its full name, publisher, and any other metadata available?”
Technical details
Endpoint
GEThttps://rotaryagency.uk/api/free/crossref?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need programmatic, per-call access to CrossRef bibliographic metadata — especially when the underlying CrossRef API is unavailable or you want a simple monetized proxy with x402 payment support. Prefer this over direct CrossRef access when operating in an agentic payment-enabled environment that already handles x402 micropayments.
Side effects
- DOI not found in CrossRef registry returns empty or error response
- Malformed DOI input causes query failure
- CrossRef rate limits or downtime propagate as errors
- Ambiguous title queries return multiple or irrelevant results
- Payment failure at $0.002/call blocks request before reaching CrossRef
Output
Schema · Response
{
"type": "json",
"example": {
"varies": "endpoint-specific structured JSON"
}
}Tags
x402
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