Yes there is an official convention [1]. EUR/USD = X means you pay X USD (the quote currency, listed second) for one unit of EUR (the base currency, listed firs

Yes there is an official convention [1]. EUR/USD = X means you pay X USD (the quote currency, listed second) for one unit of EUR (the base currency, listed first). These are usually always the same way for the same pair of currencies (EURUSD is almost always USD as the quote currency, USDCHF is almost always Swiss franc as the quote currency) [1] https://www.cmegroup.com/education/courses/introduction-to-fx/understanding-fx-quote-conventions.html https://www.cmegroup.com/education/courses/introduction-to-f...