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Re:Ask HN: Which API should I use to build an high frequency... by X4 on Saturday July 27, 2013 @08:56PM (#6115097)
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.lmax.com/trading-tech/access

http://www.hotspotfx.com/technology/apifix.jsp

http://www.easy-forex.com/int/developers/

http://www.iqfeed.net/index.cfm?displayaction=developer&sect...

https://developers.tradeking.com/

http://www.turbotrade.com/content/category/9/61/95/

http://www.activetick.com/activetick/contents/ActiveTickPlat...

Keep me updated, ok?

Re:Ask HN: Which API should I use to build an high frequency... by fosk on Saturday July 27, 2013 @10:02PM (#6115282)
What about E*TRADE?
Re:Ask HN: Which API should I use to build an high frequency... by X4 on Sunday July 28, 2013 @08:38AM (#6116508)
If you're willing to share more from your income with them, sure. This is the API link: https://us.etrade.com/active-trading/api

Advice: Please contact a specialized lawyer before you put any algos into the market.

PS: Marc, that's a cool site that you have built at http://mashape.com/ !

Re:Ask HN: Which API should I use to build an high frequency... by fosk on Sunday July 28, 2013 @09:24PM (#6118887)
Thanks, Mashape is what I'm passionately currently doing. HFT is more of a side project thing. If you are based in San Francisco, it would be cool to meet for a coffee (you can email me at: mark at mashape dot com)