The API Science platform provides capability for monitoring APIs that utilize SOAP (Simple Object Access Protocol) interfaces. The photo sharing site Flickr offers a substantive API that can be accessed using multiple protocols, including SOAP. In this article series I’ll use the Flickr API to illustrate techniques that can be applied for monitoring the status and performance of SOAP-based APIs. Flickr invented a metric they call interestingness, which ranks posted photos based on statistics including clickthroughs, comments, favorites, tags…