WorldCat Basic API The WorldCat Basic API is available to any person for non-commercial use up to 1,000 queries a day. Search WorldCat with OpenSearch and get RSS or Atom responses. Find books, video, music and more in the WorldCat database Get Titles, Authors, ISBNs and OCLC numbers Get records in standard bibliographic citation formats (APA, Chicago, Harvard, MLA, and Turabian) Get links back t