Maybe try out in the lending board. You can lend it with an equal collateral. Get some good profit of that.
It is better if you are going to lend and you have the the favor in price for the collateral. Because that's how lenders are earning.
They have more favor in the price of the collateral rather than the price they are lending.
I like loans board,but we have to be serious: you wont make big profit fast having 100$ with loaning people.
The problem is that even if collateral is worth more than the amount of btc that you loan to somebody,you need to first sell the collateral,and in most cases
it will take some time to do it,it is not so easy always.
And having 100$ and loaning is slow,because you can do 2-3 loans at maximum,so if you will need to sell,let's say 2 collateral's,it may slow up your profit,am i right?