Trades on Coinall, Okex and Bitfinex, you can sell the coins right away after you get them.
USDK is a stablecoin created by the famous Chinese Okex exchange which is worth 1 USD and trades on a few places, getting more and more attention. It's an ERC20 token so build on ethereum.
There are two ways here and you can enter one or both since each needs different things to join.
Twitter Airdrop Contest, do whats said in the tweet: