My rule of thumb: If the API contains a version number it its URL, then the developers have considered how people will use their service after they add new fea

My rule of thumb: If the API contains a version number it its URL, then the developers have considered how people will use their service after they add new features, and it's probably good to use. e.g. http://myservice.com/v1/doathing http://myservice.com/v1/doathing Unfortunately, there's hardly anyone doing this. As API's get older and we figure these things out, we should see this getting better. As a side note, if you're interfacing with any API though anything other than a wrapper, then you're asking for trouble.