We have no "dark pools" or internal liquidity creating a price for you that someone else can benefit from. Our pricing is exclusively sourced from a global network of premier banks and that's all. Other dealers may skew your individual pricing or reject individual orders depending on whether or not they make money on your trades. We do not selectively pick orders. We honour all quotes without re-quotes or rejections*. No one at OANDA has the ability to target your positions, hunt your stops or change your pricing.
*OANDA does not requote orders that are executed at the valid market price when the request is received at our server. No automated rejections, market orders only fail to be executed if they fall outside the upper/lower bounds that you choose to place to protect against price fluctuations, or if you have insufficient funds to execute your trade.