Kucoin is an Exchange where you can Buy/Sell Bitcoin and Altcoins, like Ethereum or Monero.
I've made very good profits using the pair NEO/GAS. 20% per day sometimes. ETH/XMR is very good, also.
Scan this QR CODE to visit the exchange registration page.
I would definitely can recommend you to give it a try. Any question do not hesitate to ask! 😎