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Re:Ask HN: What's a good real-time stock trading platform? by idefine on Monday August 24, 2015 @03:21PM (#10112367)
Tradier.com is another one. They have an API for developers. It's not as mature as IB, but if you are looking to start/play with something with no/minimal initial investment check it out - https://developer.tradier.com

I know that instavest.com (YC company) is powered by them as well.

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