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DOI Lookup: Citation Metadata, Authors, Journal, Citations, Abstract
x402
DOI Lookup: Citation Metadata, Authors, Journal, Citations, Abstract is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Resolves a DOI to its full citation metadata including authors, journal, abstract, and citation counts
Price / call$0.002
Success—
StatusUnknown
How this service works
DOI lookup: citation metadata, authors, journal, citations, abstract — Genesis402 / UnyKorn Operator Network
Output
Returns structured citation metadata for the resolved DOI, including the paper title, author list, journal/venue name, publication date, abstract text, and citation count.
Example use cases
Verify paper before citing
“I'm writing a literature review and want to double-check the details on this paper before I cite it — can you pull up the full metadata for DOI 10.1126/science.1157996, including the authors, journal, and abstract?”
Build reference list from DOIs
“I have a list of DOIs from my reading notes and need to turn them into proper citations — can you start by looking up 10.1016/j.cell.2020.02.052 and give me the title, authors, year, and journal?”
Check citation impact of a paper
“How many times has the paper with DOI 10.1038/s41586-020-2649-2 been cited? I want to know its citation count along with the abstract and journal it was published in.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/research/doi?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you have a specific DOI and need to retrieve scholarly citation metadata quickly without a full literature search. Ideal for enriching reference lists, verifying citations, or extracting paper abstracts programmatically. Prefer this over a general web search when you need structured bibliographic output rather than free-text results.
Side effects
- Invalid or malformed DOI returns an error or empty result
- DOI exists but the upstream resolver has incomplete metadata (missing abstract or citation count)
- Very new or preprint DOIs may not yet be indexed with full metadata
- Rate limiting or upstream resolver unavailability causing timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "crossref-doi",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.002,
"receipt_id": "g402-<16hex>"
},
"sources": [
{
"ok": true,
"name": "<source>"
}
],
"limitations": "<text>",
"generated_at": "<iso time>",
"evidence_hash": "sha256:<64hex>"
}
}Tags
x402
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