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DOI Lookup: Paper Metadata and Citation Counts

Scholarly metadata by DOI, or a best-match search by citation text: title, authors, journal, year, publisher, citation count, licence links and URL. Bibliographic facts only.

x402: $0.003 per callMCP tool: doi_lookup

Input

ParameterTypeDefaultDescription
doistringDOI, e.g. 10.1038/nature14539.
querystringCitation or title text to search when no DOI is known.
limitinteger5Maximum search results.

* required

Source and freshness

Source and licence
Crossref REST API; metadata is available without restriction (CC0 facts).
Last verified
2026-10-03 (hourly check against the live source)

Use it

HTTP (x402)

curl -i "https://api.ambolt.dev/v1/doi-lookup?doi=10.1038%2Fnature14539"

Returns 402 Payment Required with the price until an x402 payment is attached; @x402/fetch does this for you. See Get started.

MCP

{ "mcpServers": { "ambolt": { "url": "https://api.ambolt.dev/mcp" } } }
# then call the tool: doi_lookup

Apify

Not published as an Actor yet.

Example response

{
  "doi": "10.1038/nature14539",
  "count": 1,
  "works": [
    {
      "doi": "10.1038/nature14539",
      "title": "Deep learning",
      "type": "journal-article",
      "publisher": "Springer Science and Business Media LLC",
      "container": "Nature",
      "year": 2015,
      "authors": [
        "Yann LeCun",
        "Yoshua Bengio",
        "Geoffrey Hinton"
      ],
      "citedByCount": 77858,
      "referenceCount": 103,
      "licenses": [
        "https://www.springer.com/tdm",
        "https://www.springer.com/tdm"
      ],
      "url": "https://doi.org/10.1038/nature14539"
    }
  ],
  "fetchedAt": "2026-10-02T21:35:41.793Z",
  "source": "Source: Crossref REST API; metadata is available without restriction (CC0 facts)."
}

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