A technology is provided for generating a customized application program interface (API) in a service provider environment. A model is created of computing resources and data hosted by a service provider environment. An API is generated based on the model for the computing resources and the data, wherein the API is configured to enable the client to access the computing resources and data. Calls are received from the client at an API gateway hosting the API to access the data and the computing resources hosted by the service provider environment. A response to the calls is sent wherein the response is generated by the computing resources using the data accessible to the API in the service provider environment.