I can see ARK is the only coin in top 20 list (except USDT) of coinmarketcap which is positive. How can I buy this coin?
2
You can buy ARK for example on bittrex.com in exchange for bitcoins. That means that to buy it, you'll have to purchase Bitcoin first and deposit it there.
1
You can buy ARK from CoinSwitch.They provide better rates for your conversion. https://www.coinswitch.co/exchange/btc/ark/0.1