The document discusses how APIs are fueling a financial technology (fintech) revolution. It outlines key economic, social, and technological factors driving this revolution, including the maturation of app development, adoption of cloud infrastructure, and availability of APIs. APIs are lowering costs and allowing newcomers to challenge traditional financial services incumbents. The future fintech ecosystem will be made up of API leaders in different categories that work together, lowering costs and improving customer experience. This interlocking API ecosystem will increasingly power new financial applications.