You didn't specify, with which JAPANESE are familiar and would like to use, but, on the other hand, if there is a algorithmic base, it's a minor =)
Will tell you a good platform for Forex trading - cTrader
. On the same page there cAlgo
- addition to the first, allowing you to write your robots and indicators.
For writing using C#, but writing in the cAlgo is not very convenient: I advise you download the extension for Visual Studio and write in it using all of its features: debugger, and various ReSharper features .Net framework.
Now virtually all the major brokers can trade through this platform, so that problems should not arise