How do I choose the optimal broker for automated EA trading?

Three properties matter for an automated system, and none of them is the advertised minimum spread.

1. Latency and its dispersion

Average ping matters less than the spread between your median fill and your worst fill. A broker averaging 12 ms with a 1.5 pip 95th-percentile deviation is safer for a grid than one averaging 8 ms with a 9 pip tail. Grid logic assumes the adverse tail is bounded.

2. Spread behaviour under stress

Test the advertised spread during a tier-1 US data release, not during Asian session calm. The difference between those two numbers determines whether your system survives a news event. Brokers vary enormously here and the published figure tells you nothing about it.

3. Requote and execution policy

A zero-requote policy on an ECN account is a hard requirement for automated execution. On a market-maker model, requotes are normal and an EA cannot model for them reliably.

Pre-flight checklist

• Confirm the broker holds an active licence with a recognised regulator in your region.
• Confirm EA deployment and third-party EAs are permitted by the platform in question.
• Log at least 500 live orders to measure deviation before committing meaningful size.
• Confirm VPS placement near the broker servers is available at your account tier.

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