A broker execution model that means exactly that – no dealing desk intervention in trade execution. NDD brokers electronically route orders to liquidity providers or market venues without manual manipulation. Both STP and ECN brokers are types of NDD brokers. The key point is that an NDD broker is not actively taking the other side of your trade or requoting prices; orders are usually executed automatically at the available market prices. For traders and robots, NDD execution typically means faster fills and less chance of interference. Prices on NDD accounts are often variable spread (spreads may be very tight during liquid times and widen during volatility, reflecting true market conditions). When using an NDD broker, your EA should be prepared for market conditions – e.g., sudden spread spikes or slippage during news – but you generally won’t face artificial hurdles like frequent requotes. Overall, NDD is preferred for most algorithmic trading systems that thrive on efficient, transparent pricing.

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