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If you are backtesting a strategy, either exclude January 2015 or treat it as a "force majeure" test. If your strategy survives that day, it can survive anything.
Warning: Always scan downloaded CSV files for malware, though the community versions are generally safe. If you are a programmer, you can use the unofficial jforexapi or scrape the Dukascopy JSON endpoint. However, the easiest coding method is using the dukascopy Python library: dukascopy historical data
This is where enters the conversation. Dukascopy Bank (Switzerland) has established itself not just as a reputable ECN broker, but as the industry gold standard for granular, free, reliable tick-by-tick and minute-by-minute historical forex data. If you are backtesting a strategy, either exclude
In the world of algorithmic trading, backtesting, and quantitative analysis, the quality of your output is directly proportional to the quality of your input. If you are a serious retail trader, a hedge fund quant, or a financial researcher, you have likely heard the golden rule: Garbage in, garbage out. If you are a programmer, you can use