API and developer portals have become a common wholesale outlet for enterprises to make API resources and capabilities available to an internal, partner, or public consumer audience. Most leading technology companies have a dedicated developer.example.com portal setup to publish APIs, documentation, plans, SDKs, and other resources, while also centralizing the managing of API consumers, their applications and usage of API resources.
API portal provide a single place for API producers to publish their APIs, and API consumers to find what they need when consuming APIs. API portals are often associated with API gateways and management platforms, but there are also many services and open tooling available to help API producers manage their API portal presence. API portals can be centralized publicly and privately, or they can be distributed supporting different domains, regions, or other bounded context that matters to the enterprise.
As API sprawl continues to be a problem for the average enterprise, many API platforms and centers of excellence are taking a GitOps approach to augment internal and external portals, using repositories in new ways, as well as buying into platforms like Postman, SwaggerHub, and ReDocly. There are plenty of excellent examples available online when it comes to developer portals–just pick the top of tech companies or APIs you depend on and spend some time looking through their API developer portal to find what you like and do not like.