Finance12 August, 20262 min read
Miden Plans To Launch Privacy-Focused Stablecoin USDCx With Mainnet Debut Later This Month
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Miden will launch privacy-focused stablecoin USDCx alongside its mainnet rollout later this month. USDCx is issued natively on Miden and backed 1:1 by USDC via Circle's xReserve.
USDCx privacy stablecoin
Miden, a zero-knowledge proof blockchain network, plans to launch its privacy-enabled stablecoin "USDCx" alongside its mainnet debut later this month, according to a press release announced on the 12th (local time). USDCx is issued natively on the Miden network using Circle's xReserve infrastructure and is backed 1:1 by USDC deposited in xReserve smart contracts.
The design keeps balances, counterparties, and transaction history hidden from external parties by default, while still allowing selective disclosure of necessary information to auditors, regulators, or counterparties. Miden says it uses a client-side proving approach where transactions are executed and proven on user devices rather than being exposed to the network, and it frames USDCx as the foundational asset of a broader category it calls "PriFi" (Private Finance).
Selective disclosure and compliance
Crypto Briefing describes USDCx as a stablecoin that relies on Miden’s zero-knowledge architecture so the network can verify a transaction is valid and that balances add up without revealing who sent what to whom. It says balances, counterparties, and transaction histories remain encrypted unless a user or institution opts to disclose them, and that the opt-in disclosure mechanism is designed to satisfy regulatory requirements including sanctions screening and the Financial Action Task Force’s Travel Rule.
CoinDesk similarly says USDCx will allow users to make transactions without publicly exposing balances, counterparties, or transaction histories, while enabling selective disclosure for regulatory compliance. CoinDesk also reports that Miden is a California-based zero-knowledge blockchain built around client-side proof generation, where transactions are executed and proven on users’ devices rather than exposed to the network.
Launch timing and backing
CoinDesk reports that USDCx is expected to debut by the end of this month on Miden’s mainnet, and it says the stablecoin is backed 1:1 by USDC held via Circle’s xReserve infrastructure. BigGo Finance adds that Miden spun out from Polygon as an independent project in April 2025 and has received investment from a16z crypto, 1kx, Hack VC, and others.
CoinDesk also says Miden views USDCx as the foundation for a broader category it calls "PriFi," spanning private institutional trading, B2B payments, payroll, cross-border payments, and corporate treasury management. Across the coverage, the common thread is that USDCx is designed to provide privacy by default while still enabling selective disclosure to auditors, regulators, or counterparties when needed.