$63804.25
$1755.73
$580.22
$43.89
$69.97
$63804.25
47
10
1.17 GWei
Antminer S21 XP

Used Antminer S21 XP falls to $10.50/TH as public miners swap hashrate for AI

Second-hand ASICs have rarely been this cheap relative to their generation. According to Blockware Intelligence, a used Antminer S21 XP (270 TH/s) was offered on its marketplace in early October 2026 at $2,835 per unit, or $10.50 per TH/s. The same model fetched about $25/TH in September 2025 and around $15/TH through the spring and summer of 2026.

Used S21 XP price per TH/s: $25, about $15, $10.50

Where the cheap machines come from

Blockware links the slide directly to public mining companies converting their sites to AI and HPC hosting. It counts more than $70 billion in AI hosting contracts signed by listed miners, and that capacity comes out of Bitcoin mining. The machines that used to fill those halls are now being sold.

BlocksBridge Consulting puts a size on the outflow. In Miner Weekly it estimates that public miners lost about 75 EH/s of realized hashrate in the first half of 2026, while their reported HPC and AI revenue rose 52% quarter over quarter. At an assumed $20 per TH/s, that hashrate equals roughly $1.5 billion of mining hardware, not counting buildings, power gear and cooling.

Flow: public miners move to AI, used ASICs reach the market, smaller operators buy them

The paradox: hashrate is growing anyway

You might expect the network to shrink. Instead, Miner Weekly reported on October 22 that Bitcoin's seven-day average hashrate had climbed back above 1 ZH/s, its highest level since March 3, and difficulty rose 5.92% on October 16. The replacement capacity is coming from operators that keep expanding, such as Bitdeer, and, very likely, from buyers of the discounted machines.

What this means if you are buying

  • Prices vary by listing. $10.50/TH is the figure Blockware quoted for its offer; individual listings differ by location, condition and terms.
  • Check the history. Ex-fleet units usually ran 24/7. Ask for hashboard condition, warranty status and the firmware installed.
  • Rising difficulty eats into revenue. With the network back above 1 ZH/s, run your own numbers at your power price before you buy.
  • Hosting matters. Many units are sold already hosted; the hosting fee and site location affect the result as much as the hardware price.

Bottom line: the AI pivot of large miners has turned recent-generation ASICs into a buyer's market, but the same competition that keeps hashrate high also limits how long the bargain stays a bargain.

#Antminer S21 XP#used ASIC#ASIC prices#AI pivot#Bitcoin mining#Blockware
Oct 24, 2026, 7:56 AM