On Janurary 8th this year coinmarketap.com temporarily removed Korean exchanges, causing XRP to drop almost 20bn in market cap(about 30%), since XRP had a lot of it's marketcap in South Korea.
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They took out data, instead of letting you choose what you want to see!
But not, there is a working alternative! coinpuffs.com
As you can see, they support 2206 cryptocurrencies! Compared to coinmarketcap's about 1500. Plus, they support more exchanges, getting a more accurate price. Of course, the site is still in beta, for example total volume is wayyyyy off. About 16.000.000.000 USD. But on coinmarketcap.com the market cap is always much smaller, because they have less crypto there.
But the creators admitted it isn't supposed to be like this, and the development is very active! Prices also change live, so you don't need to refresh!
In conclusion: I think this site is definitely worth checking out! It might not be as polished as coinmarketcap, but it is still in beta and in active development. The same creators also made a forum thebitcoin.pub and it is quite active. Community is also friendly, and has some cool info about crypto(not as much as steemit, but wayyy more than reddit!). The creator is active there. So I recommend everyone to check out ! I personally use both sites, to get the most accurate data as possible.