According to ChainCatcher, according to The Block, F2Pool data showed that after BTC fell below $55,000, only 5 Bitcoin mining machines remained profitable, namely Antminer S21 Hydro, Antminer S21, Avalon A1466I, Antminer S19 XP Hydro and Antminer S19 XP, with break-even Bitcoin prices of $39,581, $43,292, $48,240, $51,456 and $53,187 respectively.