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Lower size on a pair you have never traded before

When you add a new pair to your watchlist, your strategy might look fine on it in backtests or on the chart. But you don't know the pair yet. How it moves during your session, how wide the spread gets at certain times, how it reacts to news, how often it fakes out levels.

Trading it at full size from the first day assumes all your experience on other pairs carries over. Sometimes it does. Often it doesn't, at least not right away.

So any new pair gets reduced size for a while. I use a quarter of normal risk for the first twenty trades or so. Then half for the next twenty. Then full size if the trades have looked like what I expected, meaning the setups behaved the way they do on my usual pairs and the costs were in line with what I'd calculated.

This isn't about results. Twenty trades is far too few to judge a pair by profit or loss. It's about whether the trades played out as planned, whether my stops were in sensible places for that pair's volatility, and whether I made execution mistakes because of unfamiliarity.

A side benefit is that it makes adding new pairs less tempting. If every new pair means weeks at reduced size, you only add one when you have a real reason to.

Same here. We also keep a short notebook per new pair for the first few weeks: typical spread by hour, the average size of the first move after Tokyo or London opens, and how often round numbers hold. After 30 or 40 trades the notes usually explain whether the losses came from the strategy or from not knowing the pair.

For Asian pairs like AUDJPY or NZDJPY, the big surprise for people coming from EURUSD is how different the behaviour is around the Tokyo fix at 9:55 local time. A quarter size period covers exactly those surprises.

Pip values differ between pairs, which matters when you're cutting size. A quarter of normal risk means a quarter of the money at risk, not a quarter of the lot size you use on EURUSD. On a pair with a larger pip value or wider stops, the lot size needs to be calculated properly. Using a position size calculator for each trade avoids getting this wrong. Most platforms have built in calculators, or you can use a simple spreadsheet. Entering the pair, stop distance and the money you want to risk gives the correct lot size every time, and removes guessing from the process.

Volatility is the big difference between pairs. A strategy with a 5 pip stop on EURUSD might need a 10 pip stop on GBPJPY to give trades the same room. If you keep the same stop distance on a more volatile pair, you'll get stopped out far more often. Looking at the average range per bar on your timeframe for the new pair tells you roughly how to scale stops. ATR on your trading timeframe gives a quick comparison. If the new pair's ATR is twice that of your usual pair, stops probably need to be about twice as wide, with lot size halved to keep the money at risk the same. Gold and the yen crosses are the usual cases where the jump in volatility surprises people coming from EURUSD.

Spread behaviour is another thing to learn. Some pairs have tight spreads during their main session and very wide spreads otherwise. Others have consistent spreads but larger jumps at news. Spending the reduced size period noting the spread at each entry gives you a realistic picture of costs, which may change whether the pair is suitable for scalping at all. Some pairs turn out to be unsuitable once you see the real costs. That's a useful finding, and a reduced size period is a cheap way to discover it. Keeping notes on spreads by hour during the trial period gives you a cost profile for that pair at your broker.

The same idea applies when you move a known pair to a new session. EURUSD during Asia behaves very differently from EURUSD during London. If you've only traded it in London and start trading it in Asia, treat that as a new market too. The pair's name being familiar doesn't mean its behaviour at that time of day will be. It applies to new instruments as well. Moving from FX to gold or indices brings different volatility, costs and behaviour around news. Reduced size for an introductory period makes just as much sense there.