"Can I buy euro?"
Translation:Я можу купити євро?
This is worded a little awkwardly in english. Is it asking if its possible to buy euros, as in to exchange currency?
Yes, the context you provided is correct.
Typically you'd ask a cashier whether you can buy, say, 200 euro, or whether you can buy euros in general, because even though they display the rate for a few currencies, they might run out of it.
How would you word that better (aside from adding "s" to euro)?