Be very careful about scams, there are sites that let you invest in them or other things, but I suggest you avoid that because you are either likely to be scammed or make so little on your investment it wont be worth your time. Plus, holding your own money in something like a cold wallet you own is the best way to avoid loosing your money to anything like scammers and hackers. Also, if something sounds too good to be true, it is too good to be true and either someone else is getting screwed (pyramid schemes) and/or you will get screwed.