Crossref

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Publisher-deposited metadata for 170M+ DOIs: titles, authors, journals, dates, citation counts, corrections and retractions.

Data: Crossref (crossref.org) · Metadata facts; mostly CC0 (abstracts remain the publisher's)

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• CrossrefCrossref SearchLive/searchMatch a reference (title, authors, journal, year) to DOIs in Crossref's registry.$0.0010per call
• CrossrefCrossref DOI LookupLive/workThe registered record for one DOI: title, authors, journal, date, type, citations, retraction notices.$0.0010per call