I quite like yawpay but the moment you get into radio advertising or having to tell people your domain they're going to struggle with the spelling.
What is the purpose of the domain? Branding has to take into consideration the product/service and brand identity.
I'd have to go with YawPay out of the two.. But, I think you could probably find something better personally..
One can see thousand of strange looking brands and names around the web. So, if you came up with any idea, you'd better speak to any consultant, rather that asking for advise within the forums. I would disagree with anyone who say anything is "awesome" or "terrible". Those would be the first to change their mind based on the brand's success or failure. So, follow your instincts and speak to anyone who does business consultancy.
Domain name should be easily remember by the people. For branding it should be smart one but the name you are trying to ask are both terrible so please try something new.