UPDATE:
I tried Trady since early August and it is real and it pays. Just did an interest withdrawal and it was instant. It works just as is stated in their website terms and FAQ. It is in my top two recommendations to try currently because it works exactly as is stated and it has been around for longer than a month and a half, which means to me that it should be around for at least another two months. Other advantages are the high daily interest rate and ability to later withdraw most of the initial deposit.
https://trady.io/?ref=tradybitcoin2017
Please use my referral link above if you want to sign up. You will reach break-even from interest alone within 3 weeks, after that it's all profit. It pays simple interest on the deposit.
The other site I tried which also works as stated in their terms is Ambis. It is similar to Trady except that there is an option to compound the interest hourly by reinvesting it automatically. The conditions are slightly different than Trady, but the details are in their Terms and FAQ on their website. Always read the terms carefully and do the math. They allow the withdrawal of the principal as well. Ambis also pays and has been around for about as long as Trady or longer. I expect Ambis to also be around for at least another two months. If 100% reinvesting and compounding you will double your money in about 20 days or so.
https://ambis.biz/?ref=bitcoin2018
Please use my referral link above if you want to sign up.
I predicted about a week ago that Bitcoin will reach 5k this year. I personally think Bitcoin will reach 7k and higher into 2018 (potentially 8-10k next year). So far so good.
Disclaimer: These are my personal opinions only. All investing involves risk, including the loss of capital. These comments are not investment advice. I am merely sharing my subjective personal views and experiences in the world of Bitcoin. Always read the fine print, do the math, and don't invest more than you can afford to lose.