Free tools / DOI lookup

Free DOI lookup: paper title, authors and citation count

Look up a DOI and get the paper's title, authors, journal, year, publisher, citation count and licence links. Bibliographic facts only.

The result appears here as JSON.

One free check per tool and IP address per day. Nothing is stored.

What you get

• Title, authors, journal, year and publisher
• Citation count, licence links and the URL

Not returned: The full text of the paper.

Use it from code or an agent

curl "https://api.ambolt.dev/v1/doi-lookup?doi=10.1038%2Fnature14539&free=1"

Same tool as an MCP tool (doi_lookup, free at 30 requests a minute), as a pay-per-call endpoint ($0.003 a call in USDC) and as an Apify Actor. Reference · Docs

Questions

Can I search by citation text?

Yes, with the API: pass query instead of doi.

Is the full text included?

No. Only metadata and links.

How current are citation counts?

They come from a public index at the time of the call.