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Re:Ask HN: What's a good real-time stock trading platform? by philippnagel on Monday August 24, 2015 @03:54PM (#10112567)
What would be the best option if one only cares about an API?
Re:Ask HN: What's a good real-time stock trading platform? by dbettin on Monday August 24, 2015 @05:47PM (#10113105)
If you only care about EOD market data, you can take a look at TagniFi's free markets API - https://www.tagnifi.com.

Disclaimer: I am a TagniFi co-founder.

Re:Ask HN: What's a good real-time stock trading platform? by mbreedlove on Monday August 24, 2015 @04:12PM (#10112667)
Interactive Brokers.