What is exactly you want to do which 'x'?
Vcash, Burstcoin, Monetha, IXledger - thats risk investments
I am not looking for very high gains, just want 10 percent roi monthly but do not want to invest more than $70.
So you can say I am lookin to grt my ROI in 10 moths(Assuming coin price remain same)
If I understand you correctly you want a Proof Of Stake (POS) coin that pays nigh on 100% interest? Or do you mean something different by "staking"?
If you do mean POS, you could look at Version (V) - it stakes at 60%, but you need to have your wallet running 24x7 and there are bound to be a few orphans that will reduce your return.
Its trading around 30-40 sats at the moment, so $70 of bitcoin would get you about 13,000 V