I know this post is very old but I would like to share my experience with changelly
yes, for me they do have hidden fees and it does not worth for sure
what I mean with hidden fees is the following
when you start a trade, you have to select the tokens and you will get an approximate estimate of the number of coins you will receive
the problem is that that estimate does not include fees
and to make things worst, they hide the fees behind a button, you need to click a dropdown to see it
I did not realize that "hidden" dropdown and I was only able to realize that it exists after I spoke with their support team
they couldn't care less, and after the session was escalated to another support member they both keep replying like a robot
"Please be sure to look into our FAQ section before proceeding to the exchanges
https://changelly.com/faq"
those bulshit pre made sentences
I lost 25% of the tokens I was buying in the dam trade, if it was transparent, and if I did not had to click an additional button, this wouldn't have happened, that is why I am saying, this for me it's hidden fees
I went ahead and did a similar trade with changenow, what an awesome experience, everything was there in the screen and what I got was what it was showing, very transparent and good customer experience
this was my experience...hope it helps other users, but for now I would suggest for you to keep away from changelly