Face Value

Face Value
In some forex trading platforms, trades are executed in standard sizes of 10,000 base currency per one lot, but in other platforms, trades are executed in standard sizes of 100,000 base currency per one lot. Therefore, there is no universal definition of what a “standard-sized” lot is, even though a “standard lot” typically refers to a trade size of 100,000 base currency units in the realm of retail currency trading.
If you want to buy 100,000 EUR/USD, you are actually buying 100,000 Euros. But if your account is denominated in US dollars, then the amount that this position would take up in your account would be however much 100,000 Euros is equivalent to in US dollars at the time. At the same time that you have bought 100,000 Euros, you have sold an amount of US dollars to get this 100,000 Euros. There is usually no maximum trading size, but some some brokers require that you request for a quote over the telephone for trading sizes bigger than 10,000,000 base currency units.