Unanswered threads widget

Hello,

I was wondering if anyone has managed to create an 'unanswered threads' widget. Basically we just want some way of listing all the unanswered threads in a specific board. I have seen the suggestion already :)

I was hoping to do this using REST Api... but I can't find anything in the Messages class that would do this. Has anyone managed to do this? 

Thanks,

Lorna