API issue seem to affect NA account for the past 2 weeks. I am a user on rankedftw, and I did contact their support, but they want me to check with the API team at Blizzard for this problem. Just want the development team to be aware of the issue. This issue seem to affect NA regional account only. Thanks for your help.
The maintenance performed today seemed to fix the API problem for NA region. Thanks for the help from development team.