Is circleex.io legit?
if there's a better exchange, it should be the one you're familiar with. never take a risk. although sometimes new exchanges create some events for their new sign-ups. but never get hooked. only use exchanges that are already trusted. it also doesn't let you put your money and leave it. if you have finished trading, then save your assets in your wallet. never leave it on the exchange.
^That is why I always matter how long in service upon choosing an exchange and the next is if they are reputable enough. Most known exchange care about their reputation and they will not ruin it whatever happens even though there is a collapse. Another is if that is a centralized exchange, they are registered and they follow government law which is very common in having a KYC.
As people above said, avoid this exchange while making research, or why not choose Binance or Kraken exchnage since they are very strict on security and KYC verification as of now.