IB知识库: Odd Lot FX Transactions 零单外汇交易 http://ibkb.interactivebrokers.com/node/1459
Orders below this size are considered odd lots and their limit prices are not disclosed through IdealPro even if inside the IdealPro bid-ask spread. As such, odd lot marketable limit orders are not guaranteed execution at the inter-bank spreads afforded to IdealPro orders, and will generally be executed at slightly inferior prices ranging from 1-3 ticks outside the IdealPro quote.