Best Way to Verify LinkedIn OAuth2/Publishing API is up?

I'm making an app that hits LinkedIn on behalf of my app's users to do things like go through the OAuth2 process and post updates to their LinkedIn profile. These are some of the URLs I'm using:

http://ift.tt/1eIxF9m http://ift.tt/1leOFps http://ift.tt/1INooK5

I'm trying to design something that will verify that these URLs have not changed and/or become not supported anymore, but also something that will verify that LinkedIn is not simply having a service outage (ex. 500 response code returned or something of that nature) with one of these URLs. Is there a good way to do this? I'm concerned about simply hitting the URLs on a regular basis (a couple times per hour, for example) and analysing the responses because of throttling limits. I also don't want to have my Developer account flagged for suspicious activity.

Any suggestions as to the best way to do this would be greatly appreciated.

Thank you