A method and apparatus for routing Application Programming Interface (API) calls from a partner entity to a telephony service provider (TSP) network are provided herein. In some embodiments, a method for routing API calls may include receiving a first message including an API call and a partner API key used to authenticate the partner entity on the TSP network to access a partner API layer disposed on the TSP network, extracting the partner API key from the first message, performing an authentication process to authenticate an identity of the partner entity using at least the extracted partner API key, and routing the first message based on results of the authentication process. In some embodiments, the first message is routed to the partner API layer disposed on the TSP network when the identity of the partner entity is authenticated.