Systems and methods are disclosed for automatically generating and publishing API information for web services, and for informing a requestor for the web services of a correct format of the request. One embodiment comprises an API gateway that identifies a plurality of software code objects for deployment, where the code objects include executable code for performing functions. The API gateway receives a request for a web service from an application, queries a code object for usage information regarding a function to perform the web service, and determines that a format of the request for the web service is incorrect based on the query for the usage information. The API gateway transmits a response to the application that specifies a correct format of the web service request based on the query, and receives a subsequent request from the application that specifies the correct format for the web service request.