I'd like to suggest something I haven't seen anyone suggest yet: the possibility of downloading a warranty letter to ensure that, even if the user closes the website page (accidentally or not), they can prove they made an exchange on your website. This was available on eXch and it was very efficient. I'll include this it in my review later.

If the customer leaves the website after sending the coins and before completing the exchange process, they can probably return thanks to the browser cache. But for me, this alone isn't enough, the user needs an official means, like a letter to minimize any potential conflicts and disputes.

It's important to include your signed message with your pgpkey in the warranty letter (I also suggest you leave it on the website).

Furthermore, I was quite excited when I discovered this service. I'll be following its development and hope you become the next instant crypto exchange reference as prominent as eXch. <3