As of 2025, Dukascopy is still the leader, but competition is rising from Crowd-sourced brokers like FTMO (prop firms) and data vendors like Polygon.io. However, given Dukascopy's banking license (Swiss FINMA regulation) and their business model (they want you to trade, not sell data), the historical data will likely remain free and open for the next decade.
for every single tick, allowing for accurate spread simulation. NYCServers Instruments dukascopy historical data
Accurate historical data is the foundation of any successful algorithmic trading strategy. Without precise data, backtesting leads to inaccurate simulations, poor optimization, and unexpected losses in live trading. As of 2025, Dukascopy is still the leader,