oanda可以下任意大小的交易单位，小到1美金，建议去oanda网站浏览一下，网站说的已经很清楚了
OANDA FXTrade allows you to trade the specific amount you want without having to round to a “lot.” You can trade $1, $250, $87,342, $1million, $10 million or anything in between. Risk as little as you like or trade precisely the amount you require. Consider the greater utility such flexibility provides:
* Overlays: A German client uses FXTrade to hedge the exchange-rate exposure of buying U.S. equity. Say she buys 100 shares of IBM @ $84.26 (USD) each; over the possible fluctuation in the price of the stock she has no control, but she can precisely limit her exposure to the fluctuation of exchange rates: when she buys 100 IBM shares for $8,426.00, she also buys 7,022 EUR/USD (at the current rate $8,426 =
