The base currency – USD. The counter currency – MXN. The USD/MXN chart is the American dollar/Mexican peso currency pair. It shows how much the USD is worth when measured against the MXN. The USD/MXN is regarded as an exotic pair. However, among the currency pairs, including the US dollar and the emerging market’s currency, the Mexican peso, is one of the most heavily traded. As neighbours, the USA and Mexico have historically close ties as trade partners. The other widely-traded pairings including the MXN are with euro (EUR/MXN) and with the British pound (GBP/MXN).