For each user, there is a user id associated. you can call HTTP POST: https://lihkg/api_v2/user/<userid>/thread
server will return:

that give you a json response included like/dislike counts of his/her most recent threads in the body. Add them together and display it as an indicator. $0.05 usually have a lot of thread with huge amount of dislike.
There may be better apis but I didn't dig too deep into it...