How can I calculate min amount of payment in crypto currency?
Minimum amount of payment in crypto (10$) is calculated according to https://coinmarketcap.com rate.
Isn't it simpler to write min amounts of payment for the most popular crypto on your site or here?
There is no sense in doing so because exchange rates are changing very often and this information can become outdated very quickly.
You accept a few cryptos and the price for alts isn't very volatile recently. It wouldn't be very difficult to update approximate rate list every day.
Yes, it is possible. And it can be done in future but now it's actually not the 1st priority thing.