In applications utilizing microservices, optimizing resource usage is crucial, and API gateway caching is a key strategy for achieving this. By caching identical responses to repeated requests, systems can save significant resources, as demonstrated by a scenario where an Orders API caches responses for requests made within a day. Kong Gateway, a robust API gateway designed for microservices and distributed architectures, offers functionalities like authentication, load balancing, and traffic control through its plugins, including the Proxy Cache plugin for response caching. This plugin enables Kong Gateway to act as a reverse proxy, caching responses based on configurable settings such as time-to-live (TTL). A practical demonstration involves setting up a Node.js Express API server that serves random programming quotes, with Kong Gateway managing both cached and uncached routes to showcase the efficiency of caching. The Proxy Cache plugin is configured to cache responses for a minute, significantly reducing the load on the API server by limiting the number of requests that hit the server despite multiple client requests. This approach, which involves setting up Kong Gateway with a DB-less declarative configuration, highlights the ease and effectiveness of implementing response caching to optimize microservices performance.