I currently have contracts at eobot and genesis-mining, but i didnt invest that much, since you'll never know if they're going to be there tomorrow. Even though those two seem to be trustworthy, bitcoin world is fast moving.
If you are interestet in that:
Ref link:
https://www.eobot.com/new.aspx?referid=311968
Non-ref:
eobot.com
Non-ref:
genesis-mining.com
Use this code when ordern to get a discount of 2.5%
J6owHx
Note: This is a referral code and it will give me a bonus too, if you use it.
Before ordering anything you should check out how you like the sites, the fees, the pros and cons. Google their names + review and read multiple articles about them.
Thats another thing i strongly recommend when thinking about using a site for anything bitcoin related.
Google its name + review or "scam?". Dont rely on one review.
Also use this forum, it will provide you with a ton of info.
And for the last part: Invest only what you can afford to lose.
I was mining on eobot too for a while, but DONT buy a contract there, the fees are insane.
For ghs 2.0 the fee is like 60%+
and for ghs 3.0 the price is just too high and i think its already a 40% fee.
Its only good to mine altcoins with your asic miner. Im mining GRC there.
I dont have experience about the other sites.