
As you scale the number of API products, consumers need an easy way to discover your APIs and build integrations. For a few APIs that do not change often, a static web page may be a good enough solution. When you have many public facing APIs, the developer portal becomes a critical feature to reduce adoption barriers. It would allow users to sign up, generate API keys, try out APIs, generate SDKs, and even pay for subscriptions.
Amazon API Gateway provides a fully managed portal feature, Amazon API Gateway Portal, that integrates with the API Gateway service and offers features like API products, interactive “Try it” functionality, and documentation for your API portfolio. See Developer Guide to get started.

You may also consider Backstage - an open sourced CNCF project for building developer portals. It can be self-hosted on ECS or EKS, provides a rich ecosystem of plugins, and is more than just a developer portal.

AWS partners also offer developer portal solutions, both self-hosted and managed. They often offer more than just a developer portal - such as documentation, monetization, and a knowledge base. Here is a non-exhaustive list of the partners: