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Round numbers are liquidity pockets, not magic lines

The usual story says round numbers like 1.1000 act as support and resistance because traders like them. That is partly right. The more mechanical explanation is that orders cluster there: take profits, stop losses, option strikes, and barrier levels set by corporate and bank clients.

The clustering has two effects. Price tends to slow near the level as it meets resting orders. And when it does break through, the stops behind the level add fuel, which produces fast moves right after the break.

For a scalper, that gives two usable ideas. Fading the first test of a round number into low volume often works. Chasing a clean break through it with momentum also works, provided the volume is real.

What does not work is treating the level as a wall that always holds. Many traders lose money putting stops just beyond the number because every other trader does exactly the same.

A cheap improvement is placing stops a few pips beyond the usual cluster, and accepting a slightly worse reward to risk ratio in return for fewer needless stop-outs.

A practical test: mark every figure ending in 00 on a chart for a week, then list what price did on the first touch of each: stalled, reversed, or ran through. Splitting the results by time of day often shows the stall pattern in thin hours and the run-through pattern in busy ones.

There is also a half-level effect worth noticing. Levels ending in 50 attract some orders as well, though fewer. And on pairs like USDJPY, the figures ending in 00 matter far more than on others, since options strikes are concentrated there.

The key mistake to avoid is treating a level as meaningful because it looks round, without checking whether price has ever reacted to it. A round number that has been ignored three times in a row has told its own story.

How do round numbers behave on the pairs traded most?

I measured how often EUR/USD reversed within 5 pips of a round number ending in 00, compared to random levels at similar distances, over a year of hourly data. Round numbers had more reversals, but the difference was modest, maybe 10 to 15 percent more often. So they do matter, likely because many orders are placed there, but they're not walls. Price goes through them regularly. Treating them as areas where activity increases, rather than fixed support or resistance, matches what I see. Activity zones is probably the better mental model.

I did the first touch test with EURUSD and USDJPY over about three months, and the results were more mixed than I expected. On EURUSD, of 31 first touches of a figure ending in 00 during the London session, price stalled or reversed on 19 and ran through on 12. In the Asian session, the stalls were far more common, nearly three quarters, while around news the run through cases dominated.

On USDJPY, the 00 levels behaved more like a magnet, probably due to option strikes, and I often saw price pin around them near the New York cut. A fade there worked decently when I waited for a rejection candle on the one minute chart rather than placing a limit order in advance.

My stop practice changed after that. I never leave a stop three or four pips beyond the round number now. I put it about 8 pips beyond, and I cut the position size to keep the risk the same.