Discovery and service mapping of application programming interface proxies

A system includes a configuration management database (CMDB). Application programming interface (API) proxies associated with a managed network provide access to resources. The system also includes a discovery application configured to perform operations including determining a proxy uniform resource locator (URL) used to provide access to a particular resource of the resources through an API proxy of the API proxies and obtaining, from a computing device associated with the API proxy, an assignment of proxy URLs to corresponding target URLs by the API proxy. Each target URL of the corresponding target URLs address a respective resource of the resources. The proxy URLs are used to provide access to the resources through the API proxy. The operations also include selecting, from the assignment, a target URL assigned to the proxy URL, generating a mapping between the proxy URL and the target URL, and storing the mapping in the CMDB.