A buyer’s checklist for ASIC miners: verify the seller, pay safely, understand DDP and customs, check warranty and DOA terms, and test on arrival.

Fixed vs metered ASIC hosting: why metered billing means downtime costs nothing, when fixed pricing makes sense, and S21 Pro and S21 XP math at 7.75¢/kWh.

Avalon Q and Nano 3S at home vs an Antminer S21 Pro hosted at 7.75¢/kWh: daily revenue, power cost, noise and wiring, with the math shown.