Hey there. I think you should look into banxshares. Coinmarketcap is indexing the price from an exchange operated by the creators of the coin and this has obviously given them the chance to showcase a false price and therefore a very inflated market cap.

Here's a post calling this out with much more detail:

https://bitcointalk.org/index.php?topic=1181883.0;all

In my opinion the coin should either be delisted or coinmarketcap should index the price from a real exchange. Currently the only one is this one: https://alcurex.org/index.php/crypto/BANX_BTC

No volume over the span of months