Is there a kind of domain site that lets you pay once (alot) and keep it for as long as you want? or is it just like on a monthly basis you have to pay?

most tld are paid by the year, you can pay 10 years up front if you wish, but that will set you back a few hundred dollars

yes, I know that, but I'm just wondering if there was a site that allows you to pay lifetime, (endless)