Springer is part of the publishing group Springer Science+Business Media. Springer Metadata API provides metadata for more than 4.8 million documents. Springer Open Access API will provide access to the full-text content, metadata, and images for approximately 80,000 articles from open access journals in the Biomed Central and SpringerOpen publishing programs. In addition, we welcome you to join the Springer API Challenge and experiment with the Springer Metadata API and the Springer Open Access API.