One of the challenges we've faced is knowing when the 3rd party services we support breaks or changes in such a way that it would break our product, or a client's application. We also wanted to know what latency levels the different social networks operate at. As we didn't find what we were looking for, we went off and built it.
Currently, we're showing you the averages for the last week. But if you're interested in having more access and the ability to look at the performance of other APIs, then drop us a line at firstname.lastname@example.org to register your interest.
The current version is monitoring a number of common web APIs, Social Networks and some carrier APIs. Over the next few weeks we'll be adding more, and will be shortly launching a premium version.
Take a look at http://viatests.appspot.com.