It is 10 usd per comment on answer but not on reply. It is lesser on reply. If you get selected or someone thanked your answer, then you get a point as well. Only answers that meet the 120 words receives 10usd and if you think your answer will be less than 120 words, then hit reply instead and earn 1 usd. On my forum sites, or the forum I am actively participating, 2 people already got paid. One from the member of the site and other is based on my observation about her points. I haven't seen a proof but all are based on the comments and observation. if where can we share our proof, I don't know too, I might search online for a payment proof but I have a trust on the site that they are paying. In the future I will make a question, and will insert a proof if i get paid so that everyone could see it.