On October 24, Tether announced that 15 companies will build connectors for its Mining Development Kit, or MDK, an open-source layer meant to let one piece of software talk to many brands of mining machines and pools. Most coverage stopped at “15 backers.” The list itself is more telling than the number, so we sorted it.
What MDK actually does
Today, a mining farm that runs Antminers, Whatsminers and Avalons, and points them at two pools, needs a separate integration for each vendor’s interface. MDK’s answer is a “Worker”: a small adapter, built and maintained by each company, that translates its own interface into one shared language. According to Tether, companies “do not have to replace their technology or surrender control” and expose only the functions they choose.
The MDK documentation already lists Worker categories for ASIC miners (Antminer, Avalon), mining containers (Antspace, Bitdeer), pool APIs (OCEAN, F2Pool), power meters and temperature sensors. Tether says its own QVAC mining agent, an AI program, already runs on MDK. Version 0.11 shipped at the Plan ₿ Forum in Lugano on October 23 and 24, and a stable 1.0 is targeted by the end of 2026.
Who signed, sorted by what they do
Tether published the 15 names alphabetically. Here they are grouped by their main line of business. The grouping is ours, not Tether’s.
| Group | Companies | Count |
|---|---|---|
| Mining pools | EMCD, F2Pool, Foundry Digital, Luxor Technology, OCEAN, SpiderPool | 6 |
| Mining hardware makers | BITMAIN, Bitdeer, Canaan, MicroBT, Proto (Block, Inc.) | 5 |
| Home heater-miner | Heatbit | 1 |
| Open protocol project | Stratum V2 | 1 |
| Not verified by us | ACME Swisstech, Elektron Energy | 2 |
Two things stand out. First, the hardware row covers the makers of Antminer, Whatsminer and Avalon machines plus Block’s new Proto rigs, so an app built on MDK could, in principle, reach most of the machine brands a large farm buys. Second, the list is heavy on suppliers and light on the people who run the biggest farms. MARA, Riot and CleanSpark, three of the largest US-listed miners, are not on it. Bitdeer is the only big public operator named, and it also makes its own chips.
That doesn’t mean those miners reject MDK. Tether calls these “initial” commitments and says the kit is open to anyone. But for now, the companies selling picks and shovels have signed up faster than the biggest buyers.
The Heatbit name is a nice detail. It’s the firm behind the space-heater and water-heater miners we costed earlier this week, where our sum came to about ₹94 a day of heat-equivalent value. It sits on the same list as Bitmain.
The other road miners are taking
The same week shows a second path. On October 23, TeraWulf, a miner moving into AI computing, filed an 8-K with the SEC raising its Morgan Stanley-led revolving credit facility from $250 million to about $400 million, a 60% increase. It added an uncommitted option for roughly $150 million more and removed a $150 million cap on letters of credit.
So one group of miners is borrowing to turn power sites into AI data centres, while Tether is betting that AI agents will run the mining machines that remain. Both bets point the same way: software, not people, doing more of the daily work of a bitcoin farm.
BtcMedia verdict
MDK is a sensible standards play, and the hardware coverage is real. The test is adoption by operators, not suppliers. Watch for two things before 1.0: whether any of the big US-listed miners announce Workers, and whether apps other than Tether’s own QVAC show up on the kit. Until then, this is promising plumbing, not a shift in who controls mining.
What it means for Indian investors
Nothing here moves the price of USDT or bitcoin on Indian exchanges, and there is no Indian company on the list. If you hold USDT, this is Tether spending effort beyond its stablecoin, not a change to how USDT works. If you mine at home, any coins you later sell are still taxed in India at a flat 30% plus cess, with 1% TDS on transfers. Our free crypto tools can help with the rupee maths.
FAQ
What is Tether’s MDK? An open-source framework that gives mining machines, pools and sensors one shared interface, so software and AI agents can work across brands.
Which companies backed it? Fifteen, including BITMAIN, MicroBT, Canaan, Bitdeer, Foundry Digital, F2Pool, Luxor and OCEAN. MARA, Riot and CleanSpark are not on the list.
When is the stable version due? Tether targets MDK 1.0 by the end of 2026. Version 0.11 was released on October 23 and 24.
How we calculated this: we grouped Tether’s published list of 15 participants by each company’s main business, checked TeraWulf’s figures against its October 23 SEC filing, and wrote this at 11:05 AM IST on October 25, 2026.
This article is for information only and is not financial advice.