Abstract: A system and method for routing requests to an API to two or more API endpoints are disclosed. The system comprises at least a gateway router and a configuration server. When software is executed, the system transmits, from the configuration server to the gateway router, information setting a desired proportion of API requests to be allocated to each of the two or more API endpoints. When API requests are received, the gateway router forwards the API requests to the API endpoints in the desired proportion. The system receives metrics data from one or more backend entities upon which at least one of the API endpoints relies for data or other services, and determines that an adverse event is underway or imminent based at least in part on the received metrics data. In response to the event, it forwards the API requests in a second proportion different from the desired proportion.