How can you even guarantee a return? The best you could really do is less than a percent in dollars for a CD, and it's still not instant access to your money.  You could purchase some type of bond, but that's even less access.  10% return, instant fund access and low risk don't go together at all.

And @OP, you will have to provide a lot of transparency and show proof of your past (recent past as well). Not just short-term but long-term. Anyone can make a lot in a day or a week. Keeping that consistency for months or years is more difficult.