Cex.io I know is legit site, before they turn into exchange site, formerly they is cloudmining site, time goes by they turn into exchange site. They do pay member formerly, I also joined.
You can see their schedule fees here
https://cex.io/fee-scheduleBut they ask only passport or driving license as identification document to approve my verification process but I am not ready to submit either of them (I submitted my national card) hence my verification process got rejected. I was not successful to buy bitcoins with them yet.
I just checked there there is no mention about only for passport or driving license. Did you contact their support regarding this ? I believe an ID proof could be anything but Government issued.
If you visit the site, you can find verification page direct you to guide how to verify your account, so I think it's like other centralization exchange site.
I haven't longer to use their site again.