Could you not use fun-captcha? Please let us know the result. I just don't like the idea of using googles captchas if they don't pay well. I didn't even know you got paid for resolved. do recaptchas pay as well?
I have seen somewhere the advertising is built into the background of the puzzle captcha you have to solve.
we actually tried it once but its a bit buggy or maybe doesn't go with the website well, but user would have to solve multiple times to get it to work :/ i wish it would work for us cuz it seems like the best option out there