Not sure what's up with that - Olark's been online all day (I know, it's been busy with the divshot news) and our API has had no issues (again, we've been seeing lots of activity).
The API call you list there is only available with an authorization token, so it's supposed to give a 401 unless you're logged in...
Feel free to ping me directly if you're still having trouble: [email protected]
GET https://api.netlify.com/api/v1/sites?page=1&per_page=50 401 (Unauthorized)
Olark is returning 403, too.