This thesis aims to explore the significance of API Gateways in the context of microservice applications. We start with a theoretical background necessary to understand what is the right way of designing microservices and APIs. We follow by looking into the available API gateways solutions, determine what functionalities are required from them based on analysis of literature, case studies and interview. Finally, we choose a set of API gateways that best represent the current state-of-the-art, deploy them on the Kubernetes cluster in front of the demo application service and assess their functionalities and performance.