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I've had experience with IB in a quant fund setting. I was impressed with it. Significantly further ahead of the curve in regards to their API offering compared to other brokerages.

At my last check it was mostly geared towards C++/Java with less than ideal documentation. However there are some good open source wrappers available (Python): https://github.com/blampe/IbPy

As stated in the parent comment, the minimum account balance is $10k.

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Not to mention PDT requirement is $25K and more like $30K if you want to get a good buffer zone. You can also trade it via FIX. They open sourced their API here: https://github.com/InteractiveBrokers/tws-api

Thanks for the Github link. I hadn't realised they had become open source!

Although (I had a 404), I think it's actually: https://github.com/InteractiveBrokers/tws-api-public

Indeed the PDT requirement is a pain...

Pattern Day Trader is a Finra/NASD rule.

There's a ruby client for IB, believe it or not. It's not bad, either.

https://github.com/ib-ruby/ib-ruby

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