The xID API will be retired 15 March 2016. For further information on the retirement of the service please see the full new announcement.


Submit an identifer such as an ISBN, ISSN, or OCLC Number to this service, and it returns a list of related identifiers and selected metadata.

  • Status: Production
  • Sandbox access: No

What you get

  • Basic metadata about the object
  • A list of other editions
  • Fixes Checksum with ISBN and ISSN
  • For monographs,
    • a list of other editions
    • Information about availability of fulltext from Open Content Alliance and/or Hathi Trust
  • For Serials
    • all the forms related to a given ISSN
    • all the related ISSNs including other editions as well as preceding and succeeding ISSNs
    • raw coverage
    • the linking ISSN (ISSNL)
    • whether or not the item is peer reviewed
    • table of Contents RSS feed
  • Converts between 10 and 13 digit ISBNs
  • Adds hyphens to ISBN

Who can use it

Sandbox access of 1000 queries/day is available to anyone. Production access is available for libraries that subscribe to Cataloging.

Commercial partnerships are also available.

Authentication & Authorization

xID uses IP authentication and token based authentication for production level access.


API access to

Service categories


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