please suggest a trading platform with API access

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I thought of posting an update as my transition to new platform is completed after I started this thread. I searched around a bit more for different platforms with API access and decided to go with Rithmic API platform and Optimus Futures for IB. On-boarding has been very smooth, @mattz from Optimus Futures has been extremely helpful in getting API access to Rithmic Test and Paper Trading platforms very quickly. After testing for a few days, I got API access to live trading platform and completed the transition. As for my original question about finding a suitable trading platform to integrate my java based application, I ended up adding simple listener port to the sample programs provided with Rithmic API, converted it into a bridge program with few minor changes here and there. Response time on Rithmic live platform is simply amazing. I am seeing 1.5 to 2 milliseconds for ES futures, on Rithmic server timestamps from order received to completed/processed with the CME exchange. Another 25 milliseconds to send the order from east coast to Rithmic server in Chicago, but that delay is because of my desktop and ISP, not related to Rithmic. One interesting thing with Rithmic market data is that the depth of order book is not 10 or 20 levels on each side, it is the entire order book, I have never seen this kind of data before Thank you very much @mattz for your help.

It was a pleasure helping you through the process. However, you are the one who did the heavy lifting, showed patience, and gave valuable information about Rithmic. In short...thank you as well!
In the upcoming weeks, we will be releasing something new with Rithmic, we should gain contact to get your feedback.

Matt Z
Optimus Futures

There is a substantial risk of loss in futures trading. Past performance is not indicative of future results.