Frequently Asked Questions

Letsmines accepts Bitcoin (BTC), Ethereum (ETH), Tether (USDT) on ERC20 and TRC20 networks, USD Coin (USDC), and USD bank wire transfer. We do not currently accept credit cards. All crypto prices are locked at time of invoice.

Contact us via the Contact page or WhatsApp/Telegram with the product(s) you want to order and quantity. We’ll send you an invoice with payment details. Orders are confirmed after full payment is received.

Yes. Letsmines offers volume pricing for orders of 5 or more units. Contact our sales team with your requirements for a custom bulk quote. Discounts increase with order size.

Yes. Letsmines is a genuine ASIC miner supplier selling authentic Bitmain hardware. Every order includes a Certificate of Conformity confirming product authenticity. We ship SPOT inventory with 365-day warranty coverage.

SPOT orders ship within 7 working days after full payment confirmation. We ship worldwide via express courier (DHL, FedEx, or equivalent). Delivery time varies by destination but typically 3–7 additional days after dispatch.

Yes. We ship to most countries worldwide including the US, Canada, Russia, Kazakhstan, EU countries, and Africa. Some destinations may have customs restrictions — contact us to confirm availability for your country before ordering.

SPOT refers to products available in our current inventory — ready for immediate shipment. As opposed to pre-order items (which ship weeks later), SPOT orders ship within 7 working days because the hardware is already in stock and allocated to you after payment.

Prices listed at Letsmines are ex-works / FOB pricing. Customs duties and import taxes are the responsibility of the buyer and vary by country. We recommend checking your local import regulations before ordering. We can assist with shipping documentation.

The most efficient Bitcoin miners in 2025 are the Antminer S23 Hyd (580 TH/s at 9.5 J/TH, $17,400) for hydro cooling, and the Antminer S21 XP (270 TH/s at 13.5 J/TH, $4,590) for air cooling. For best value, the S21 Plus (216 TH/s, $2,199) offers excellent performance at a competitive price point.

Air-cooled miners use fans and require only standard 220V power — no special infrastructure. Hydro-cooled miners circulate liquid coolant for higher efficiency (lower J/TH), higher hashrates, and quieter operation. Hydro requires a coolant loop setup but offers better long-term economics for large farms. See our full cooling comparison guide.

We stock miners for Litecoin (Scrypt), Zcash (Equihash), Kaspa (KHeavyHash), Alephium (Blake3), Monero (RandomX), Ethereum Classic (Ethash), Kadena (Blake2s), Dash (X11), Nervos CKB (Eaglesong), Siacoin (Blake2b), and Handshake (Blake2b+SHA3). View the full list at our Altcoin Miners page.

Yes. We supply ANTSPACE mining containers (air, hydro, and immersion variants), ANTRACK rack systems, DCTANK, DCRACK, transformers, power cabinets, antifreeze coolant, and other accessories for professional mining farms. See our Infrastructure page.

All ASIC miners sold by Letsmines include a 365-day manufacturer warranty. A Certificate of Conformity (CoC) is provided with every order confirming product authenticity and compliance.

Contact our support team within 48 hours of receipt with photos of the damage and packaging. We work directly with the courier and manufacturer to resolve DOA (dead on arrival) claims under the warranty.

Yes. Our team can assist with setup questions, firmware configuration, pool connection, and troubleshooting via email, WhatsApp, and Telegram. For large orders, a dedicated account manager is assigned.

Profitability depends on your electricity cost, the miner’s efficiency (J/TH), BTC price, and network difficulty. With an efficient miner like the S21 XP (13.5 J/TH) and electricity below $0.07/kWh, mining can be profitable. Use a real-time mining calculator and factor your full electricity + hardware costs before purchasing.

It depends on the model. Entry miners like the S19j Pro use ~3,068W. The S21 XP uses 3,276W. Hydro miners like the S23 Hyd use 5,510W but produce much more BTC per watt. Calculate: watts × hours × electricity rate = daily cost.

Popular and reliable Bitcoin mining pools include Antpool, F2Pool, Foundry USA, and ViaBTC. For altcoin mining, each coin has preferred pools — our team can advise on the best options for your specific miner model.