As far as I know, the ethereum transaction fees so high. Is there any cryptocurrency for micropayment.
Which cryptocurrency is the most promising for micropayments?

I have read the tutorials for making ERC20 tokens. But there is no mention of how to make the coins mineable.
Is this possible and how do I got it?

Some mining ICO company said "Earn Passive Income with Up to 13% Monthly Payouts Investing in XXX Tokens".
Is that possible? To guarantee this condition, how much the bit coin must maintain the price?