You most likely are going to get American customers so your best keeping all prices USD, I am not the best with banks or anything but you can always withdraw your money and translate it to UK currency.
If I were you, I'd have one column with the British pounds ( assuming that's what the currency is) and then in another column, right next to it, I would have the American translation. Then that way you can reach out to more than one kind of country. Of course, that is if you're planning on catering to both Americans and British or Ukranes alike. I've seen this done on some advanced hosting sites before, and I believe that that does help understand how much you really owe, depending on what country your in.
See the exchange rate is always changing so this means i would have to change the prices nearly every day. But as said i have added a column with Pound and Dollas 🙂
You could just post the price in one currency and then give a link to an online converter so customers can manually check it to see and it keeps it up to date.
Well ive had a play with the exchange rate and i want the main prices in pound so ive exchanged from US dollas into how much it would cost in pound if that makes sense? Ive also stated within the site that the exchange rate will be checked weekly to keep it all fair. And also having a link would be good to the exchange site 😀