Agreed the major pairs have good liquidity plus volatility to make profits and they also comes up with low spreads.
Scalping trading for active trader maybe on days trading they can open so many trades daily, there is scalping trader make a hundred times transaction with scalping.
I would suggest EURUSD, GBPUSD and USDJPY, though they have high volume and high liquidity, but they have extremely low spreads making it possible to scalp on small pips move. I just appreciate the fact that my broker forechief offers flaoting spread from 0 pips, which I feel is god for such conditions.
I trade EUR/USD and GBP/USD because they offer tight spreads. Some traders also prefer trading minor currency pairs which also include AUD/GBP.
I prefer scalping GBP/USD. As in scalping I need to make frequent trades, to make good overall profit tight spreads are required. And this pair being a major currency pair offers tight spreads.
when time to scalp just make sure perfect risk management. otherwise trading life could be dangerous.
I'm a scalper, and for me, the best pairs are EURUSD and GBPUSD because they have good liquidity and volatility, which help in making successful trades with some of the lowest spreads.