At the moment everyone speaks about Crypterra beeing so good because of the prices and the insane ROI, but don't be too hasty when it cones to investing there.
They got plenty people concerning about missing hashrates, lack of transparency and other shady stuff. Inform yourself before investing. I for myself thought I would try them out with a really small amount about 50$, and if they can prove legit, I only would starting to invest more.
If you like to try the site, purchase only a small investment until they've proven legit... if you do so, I would appreciate if you register via my ref link : https://crypterra.net/?code=CR13274