DOI Lookup & Academic Paper Search

x402

DOI Lookup & Academic Paper Search is a paid API for AI agents from agent.maddegen.art, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Resolves a DOI or searches by title/author to return full citation metadata including title, authors, journal, year, citation count, publisher, license, and formatted APA/BibTeX citations.

Price / call$0.001

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StatusUnknown

How this service works

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Output

Returns structured citation metadata for the matched paper including title, authors list, journal, publication year, citation count, publisher, license type, and pre-formatted APA and BibTeX citation strings. Response also includes a brief summary and billing info.

Example use cases

Citing a paper in a research draft

“I have this DOI — 10.1016/j.cell.2021.05.004 — can you pull up the full citation details and format it as APA for me?”

Finding a paper by title or author

“I'm trying to find metadata for a paper about CRISPR gene editing by Jennifer Doudna — can you search for it and tell me the journal, year, and citation count?”

Batch citation prep for a literature review

“I need BibTeX entries for these two papers: DOI 10.1038/s41586-020-2649-2 and one called 'Attention Is All You Need' by Vaswara et al. — can you look both up and return the BibTeX for each?”

Technical details

Endpoint

POSThttps://agent.maddegen.art/hub/api/v1/tools/doi_lookup?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to resolve a specific DOI or search academic papers by title/author and retrieve structured citation metadata including formatted APA and BibTeX output. Prefer this over general web search when you need machine-readable citation data, citation counts, or license information in a single call.

Side effects

DOI not found in registry — returns error or empty data
Ambiguous title/author query returns wrong paper — may need more specific query
Rate limiting or payment failure via x402 protocol
Malformed DOI string rejected with validation error
Paper exists but metadata is incomplete (missing license or citation count)

Input

Schema · Request body

Field	Type	Description
doi	string	e.g. 10.1038/nature14539
limit	integer
query	string	title/author search instead of a DOI

Output

Schema · Response

{
  "ms": 120,
  "ok": true,
  "data": {
    "summary": "Resolve a DOI — or search a paper title — to full citation metadata: title, authors, journal, year, citations count, publisher, license, and a ready-made APA/BibTeX citation."
  },
  "tool": "doi_lookup",
  "billing": {
    "usd": 0.001,
    "mode": "x402"
  }
}

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