Microsoft Azure Service Bus - WCF Relay - fee - 1000 relay hours

Depend on Azure Service Bus when you need highly reliable cloud messaging service between applications and services, even when one or more is offline. This fully-managed service eliminates the burdens of server management and licensing. Asynchronous operations give you flexible, brokered messaging between client and server, along with structured first-in, first-out (FIFO) messaging, and publish/subscribe capabilities - excellent for tasks like order processing.