Web Services

WorldCat Registry

Authoritative single source for institutional metadata
OCLC's WorldCat Registry is a free Web tool that provides a single location from which any library can manage and distribute data that describes its institutional identity and services.

WorldCat Search API

WorldCat access through library Web sites
The WorldCat Search API provides machine-to-machine access to WorldCat bibliographic records and holdings organized to group similar editions of the same item together.  The holdings information provided includes links directly to cataloging libraries’ OPACs, resulting in the seamless delivery of WorldCat information through library Web sites.

xISBN

OCLC Web service
OCLC's xISBN service is a machine-to-machine service that supplies ISBNs and other information associated with an individual work in WorldCat—the world's richest database for discovery of items held in libraries. Submit an ISBN to the service and it returns a list of related ISBNs and selected metadata.

xISSN

OCLC Web service

xISSN is a Web service that supports management of  serials information. Users  can supply an ISSN to find out about any predecessor, successor, and alternate ISSNs and titles, and find the electronic ISSN for a print title or vice versa.