USD/MXN is the exchange rate between the US dollar and the Mexican peso, showing how many pesos one US dollar will buy. It is an exotic pair, making up about 1.5% of the roughly $9.6 trillion that changes hands in the global forex market each day (BIS Triennial Survey, 2025), and it carries wider spreads and much larger swings than the majors.
The US dollar is the base currency and the peso the quote currency, so a quote of 18.5000 means one US dollar is worth 18.5000 pesos. A rising price means the dollar is strengthening against the peso, a falling price the reverse. You trade USD/MXN as a forex CFD, taking a position on the price rather than holding pesos outright: go long if you expect the dollar to rise, short if you expect it to fall. Pips are at the fourth decimal place, and your result is the pips gained or lost multiplied by your position size, settled in pesos.
The peso's high interest rates make it a favourite carry trade, where traders borrow a low-yielding currency to hold pesos for the yield, so the pair can stay calm for long stretches and then lurch when those trades unwind. Banco de Mexico's rate decisions, the price of oil and the state of US relations, including trade and tariff news, all move it, and as an emerging-market currency the peso sells off quickly whenever global risk appetite turns.
Say USD/MXN is trading at 18.5000 and you expect the dollar to strengthen, so you buy one standard lot (100,000 US dollars). Each pip is worth 10 pesos. Given how far this pair can travel, a 1,000-pip rise to 18.6000 gives:
1,000 √ó MXN 10 = MXN 10,000 (about $540)
A 1,000-pip fall to 18.4000 would instead cost MXN 10,000. The contract is worth $100,000, and at 30:1 leverage your margin is about $3,333, which magnifies both gain and loss.