7% fees? Wow, it may be still a hod fee for buying the crypto. However, they may give you some benefits for buying the crypto in that platform.
However, have you researched this platform? Is this safe and trusted? For, this sounds new and this is my first time to know Changelly.
Actually, there are several exchanges that may give you lowered fees by depositing your fiat first to the exchange and then buying some coins there. Try to seek the local exchange in your country that has been trusted, it will be easier and more effective to do.
Yes, it's true that this is my first time hearing about it, I'm not sure about Changelly, the 7% fee is too expensive for me.