Any legit site for Captcha work

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I am regular member of PTC sites. I always want to earn some extra money at my free time. So in Internet I always look for some online paying sites. Now I want to try something new, can anyone know any of the captcha creating websites which are legit and paying. Is it similar to clicking ads in PTC sites,I mean in terms of amount/money. Is it less than what we get from a PTC site? Please help me in this Thanks in advance!!