They dont give a dollar amount but they do go 50/50 on ink that you get because episodes are locked. So you'll get more ink then it would with a regular tip not to mention your comic will be promoted on the platform so it brings in new readers. I would imagine there would be more money that though involved like a monthly payment or per episode, but I cant confirm that. Im guessing both Tapas and Webtoons pay the creators differently based on popularity for their comics so they dont post how much they pay.