This document discusses platforms that enable innovation through open architecture patterns. It provides examples like TCP/IP, smartphones, Aadhaar digital identity platform, and UPI digital payments platform in India. These platforms follow principles of being minimal, standardized, unbundled, generalized, layerable and ecosystem-driven. This allows innovations to happen on both sides of the platform by applications/systems developers and device/network providers. The document outlines how Aadhaar identity platform with over 1 billion enrollments and UPI digital payments with over 250 million transactions per month have transformed financial inclusion in India through such open architecture approaches.