Purchases on Storybird are in US dollars.
If you make a purchase with a card that was not issued for US purchases (for instance, Euros or Pounds), your card company will convert the US price into your country currency at the current currency rate. (If you need to be refunded for whatever reason, they'll use the currency rate on the day they process the refund. This may differ from when your card was initially charged.)
Your bank may add a fee for conversion. Contact them for details.
We do plan to add other currencies as we grow. Particularly the British Pound since we like the BBC and David Bowie.