Is there an alternative to national currency to digital money for International use over the Internet?

How can a person or a company in "country A" buy or sell from another person or company in "country B" without depending on either national currency? Those currencies go up and down. Is there a *stable* currency that is interchangable anywhere, especially on the Internet?|||Often for international transactions, services like PayPal are the way to go. because PayPal can instantly convert your money on the fly from the US dollar ($), to the British Pound (拢), Japanese Yen (楼), or Euro (鈧?|||ther is no alternative that I've ever heard of