2Captcha claims that you can earn up to $1 for solving 1000 Captcha & receive bonus for solving complicated Captchas.
You can also earn by referring more people to 2Captcha.
You can immediately start earning once you signup & login to the site. You can get paid by PayPal, Payza & WebMoney.
Minimum Payout for WebMoney is $0.5, for PayPal is $5 & min. pay for Payza is $1.