The Open Access Plagiarism Search is a tool for detecting plagiarism. The Department of Information Technology at Physikalisch-Technische Bundesanstalt designed it to search multiple open access repositories of academic papers. Users can search against full text inventories, or register their own repositories. Their API exposes the projectâ€™s plagiarism search functionality. It is a SOAP-based API and returns XML-formatted data. Developers must request access to it.