Usd to XEM on changelly

I can’t buy XEM on changelly by USD anymore what happened?

If in Nano, Changelly exchange widget started to show this issue:

Unhandled promise rejection TypeError: e is null
Trace de la pile :
[1066]/h</<.value/<@https://changelly.com/1.1.55e6069dd083df9dddb7.js:5:4179
J/</a@https://changelly.com/main.55e6069dd083df9dddb7.js:16:18979
J/<@https://changelly.com/main.55e6069dd083df9dddb7.js:16:19101
e.exports/r@https://changelly.com/main.55e6069dd083df9dddb7.js:16:10457 

It is on their side. Sometimes it works, sometimes it doesn’t…

I have contacted them a couple days ago but no reply yet.

Hello.

I have one question related to the Nano Wallet security and usage of 3rd party services within the wallet.
Could there be any chance that using 3rd party services could lead to a security issue within the wallet in case a 3rd party service gets hacked?