Machine-implemented methods for validating a web site analytics configuration are provided. In one aspect, a method includes receiving, with a low latency web site traffic analytics and monitoring service, a registration for a web site, and sending an initial transmission to the registered web site, the transmission configured to generate a response transmission of web site traffic data to the analytics service. The method also includes outputting a notification indicating that the web site has been successfully registered with the analytics service when the traffic data is received by the analytics service, and outputting a notification indicating that the web site has not been successfully registered with the analytics service when the traffic data is not received by the analytics service. Systems, graphical user interfaces, and machine-readable media are also provided.