A strategy on paper is not a trade. It is a practice: you measure your broker, test at the minimum lot, and only then risk real money. The Westernpips study recorded gold at three retail brokers and found windows that differ by broker — a median of 34 ms at one, 56 ms at another — and results that turn negative at different delays. That is why the first rule is to test. For traders who want to trade the strategy, not just read about it, latency arbitrage trading starts with measurement.
Three Brokers, Three Different Windows
The study recorded XAUUSD at three retail brokers — A, B, and C, names withheld — one session each, at a 30-point gap. Broker A, with a 10-point spread, updated its quote 2.7 times a second, had a median window of 50 ms, and returned +22 points at a 30 ms delay. Broker B, with a 12-point spread, updated 9.2 times a second, had a median window of 34 ms, and returned +12 points at 30 ms. Broker C, with a 46-point spread, updated 6.2 times a second, had a median window of 56 ms, and returned only +2 points at 30 ms. The same strategy, three different brokers, three different results — that is latency arbitrage trading in practice. That is the first lesson of latency arbitrage trading: the broker is part of the strategy.
Measure Your Own Broker
Windows differ by broker, so test yours before you start latency arbitrage trading. The study opened a window when the gap passed 30 points — for gold, 1 point is 0.01 USD, so 30 points is 3 pips — and closed it when the gap fell back. With a 30 ms delay, 54–67% of the 30-point windows were still open when the order arrived. The average result turned negative at delays from about 40 ms to over 150 ms, depending on the broker. Your broker's numbers will be different, and the only way to know them is to record its quotes and measure. Good latency arbitrage trading starts with your own data, not someone else's.
Costs That Eat the Edge
The study's numbers are displayed quotes, not executed trades: commission, slippage, rejections, and last look are not included. Treat the numbers as a ceiling. A 7-point commission turns a +44-point gross result into +37 net, and a slow order turns a profit into a loss — the same gold signal made +37 points at 150 ms and lost 4 at 250 ms. Spread matters too: Broker C's 46-point spread left almost no room, returning only +2 points at 30 ms against Broker A's +22. In latency arbitrage trading, costs are not a detail — they decide whether the edge exists at all.
Test at the Minimum Lot
Check your broker's terms first — some brokers welcome this type of trading, others limit it — and test at the minimum lot before risking more. Record the broker's quotes, test your settings in the Back Tester on recorded ticks, and tune the presets to your broker's spread and commission. The team at Westernpips installs the software on your VPS and helps with tuning, and updates are free for all licensed users. A lifetime licence starts from $777. For traders ready to measure first and trade second, latency arbitrage trading is the guide to start with.
