Current price is ~$4.  Current supply is 709,000 coins.  So current market cap is “now” is $2.8 million.  Which puts it into the 500s rank on CMC.  

Of course it is inflating rapidly with 72,000 coins issued per day.  So if it can hold its current price of $4, by the end of 12 months it would have a market cap of ~$124 million.  Which would put it slightly ahead of Bitcoin Diamond in rank 40...

My preferred metric is to look at the 3 year supply which values it between Maker and ETC.  Which is a top 20 slot.  But that 3 year time line also puts us deep into the next bullmarket so who knows.

So I don’t know where $4B valuation comes from, unless you intend to wait 30 years at the current price.