Hello, I am looking for a platform independent API with which to trade stocks. ETrade and Tradeking both offer suitable API's, but ETrade is $10 a trade (and being sketchy), and I hear that Tradeking has trade execution issues (plus no sandbox). I am used to what I consider very fast execution with Scottrade, any slower and I would be unhappy. TDAmeritrade has a $25k minimum to use their API after talking with customer service. I DO NOT want monthly fees for using the API, or a high minimum such as $25k, and I do not want a Java based API such as with interactive brokers. I would much prefer a message over HTTP based system such as what ETrade, TK, and TDA use, but without their downsides. I have years of experience with C and UNIX socket programming, so I want to stick with what I know quite well. Am I asking for something that doesn't exist, or is what I want out there somewhere?