API marketplaces and API gateways are two distinct yet complementary tools in the API ecosystem. An API marketplace functions like online marketplaces such as Amazon, enabling developers to discover and connect to APIs while allowing providers to list, monetize, and manage their APIs. It typically includes components such as developer and provider portals, search capabilities, standardized documentation, and more. On the other hand, an API gateway serves as an architectural component that sits in front of APIs to provide essential functionalities like rate limiting, traffic management, authentication, and logging, thus facilitating the efficient processing of API requests in a microservice architecture. While an API marketplace is designed to cater to both API consumers and providers, an API gateway primarily supports API creators. Companies can use both tools together, employing an API gateway to streamline their microservices and an API marketplace to market and monetize their public API offerings.