According to Odaily Planet Daily, according to F2Pool data, as BTC fell below $55,000, only five mining machines are still profitable. These five mining machines are Antminer S21 Hydro, Antminer S21, Avalon A1466I, Antminer S19 XP Hydro and Antminer S19 XP, and their shutdown prices are $39,581, $43,292, $48,240, $51,456 and $53,187 respectively.