This document discusses strategies for creating a sustainable ecosystem with open APIs to enable business agility. It defines open APIs and OpenAPI specifications for programmatic access to applications and services. The key aspects covered include building blocks that work symbiotically, standardizing digital interactions through data operations and packaging, and using API marketplaces for monetization with features like developer sandboxes, throttling tiers, and identity/access management. Intelligent API models are proposed with capabilities like streaming analytics, predictive scaling, and security to optimize API usage and performance.