Depends on which Exchange you focus on, I guess NASDAQ. You also forgot the tell us in what language you want to develop. First things first: You know that ac

Depends on which Exchange you focus on, I guess NASDAQ. You also forgot the tell us in what language you want to develop. First things first: You know that access to real-time data costs some money right? I mean a friend pays 3k/monthly (real-time incl. support). Paying upfront before you even have started doesn't make much sense. Don't get schocked by that price, he's doing it professionally and what he pays for his servers is n times more than that. Some links to APIs: http://www.nasdaqdod.com/ http://www.nasdaqdod.com/ http://www.lmax.com/trading-tech/access http://www.lmax.com/trading-tech/access http://www.hotspotfx.com/technology/apifix.jsp http://www.hotspotfx.com/technology/apifix.jsp http://www.easy-forex.com/int/developers/ http://www.easy-forex.com/int/developers/ http://www.iqfeed.net/index.cfm?displayaction=developer&section=main http://www.iqfeed.net/index.cfm?displayaction=developer&sect... https://developers.tradeking.com/ https://developers.tradeking.com/ http://www.turbotrade.com/content/category/9/61/95/ http://www.turbotrade.com/content/category/9/61/95/ http://www.activetick.com/activetick/contents/ActiveTickPlatformPricing.aspx http://www.activetick.com/activetick/contents/ActiveTickPlat... Keep me updated, ok?