Scalping trades for a few pips, dozens or hundreds of times a day, on one to fifteen minute charts. Scalping EAs are the most marketed category on the MQL5 Market, often with very high win rates.
The claim is that small, frequent profits compound faster than large, rare ones, and that short timeframes offer more opportunities.
We tested scalping strategies of every kind we could define, on currencies and gold, across 17 years of data with real trading costs. None survived. Before costs some showed small positive results; after spread and slippage every one of them lost, and lost with a statistical certainty that no other family in our testing matched.
The reason is on the pages about spread and commission: a strategy averaging three pips a trade pays a third of its edge in costs at the best broker and all of it at an ordinary one. The frequency that makes scalping attractive is the frequency that makes it pay costs hundreds of times a year.
If you trade it anyway, compare the average winning trade in the live record with the spread plus slippage at your broker at the hours it trades. If the second figure is more than a quarter of the first, the strategy has no room to survive.