Genuine PTC websites don't ask its users to submit any money, registration is free and getting started is also free. But to upgrade your account to get more clicks to earn more money you have to pay small amount. Clixsense, Neobux and other websites which are paying its users from last few years. There are some scam websites also present there, ptcbank.net which is free to join and give high amount on per click, but when you search for user reviews, lots of users complained that they have not get their payment even if they reached payout. So it is good to read other users reviews before joining such companies.