: Some instrument data traces back to the 1990s, allowing for long-term market cycle studies.
| Feature | Dukascopy | OANDA | Forex.com | DTE (DTN IQFeed) | | :--- | :--- | :--- | :--- | :--- | | | Free (Yes) | Paid (API) | No | Paid ($) | | Goes back to | 2003 | 2005 | 2010 | 2000 | | Cost | Free | $0.10 per 100k ticks | Free (Daily only) | $70+/month | | Spread Accuracy | True ECN | True ECN | Brokered Marks | True ECN | dukascopy historical data
: Evaluate trading strategies against actual historical market conditions. Technical Analysis : Some instrument data traces back to the
On Christmas or New Year’s Eve, spreads blow out to 50 pips. If your backtesting script doesn't account for spread widening, it will show false losses or false profits. If your backtesting script doesn't account for spread