In this paper written, by Dan Woods, Chief Analyst CITO Research, enterprise architecture requirements are outlined for designing, managing, and protecting APIs and how the emerging API Gateway “proxy” deployment model is speeding deployment across industries. In this model, authentication using OAuth and other lightweight protocols such as REST and JSON are all the rage but Enterprise-class security is still lacking. To present actionable solutions, Dan presents 5 core API patterns for mobile, partner, data control, and PaaS infrastructure with actionable diagrams and a monetization model for APIs. In his forward for the paper, Programmable Web founder John Musser, summarizes the trends that have driven the explosion in API usage and why the API has become the “glue for SaaS.”