Miden to launch privacy stablecoin USDCx backed 1:1 by USDC

Miden plans to launch USDCx, a privacy-focused stablecoin backed 1:1 by USDC through Circle's xReserve infrastructure, when its zero-knowledge mainnet goes live later this month. The token is issued natively on Miden, keeping balances, counterparties and transaction histories private by default.

"On most public blockchains, every transaction is public. Every balance, every counterparty, every payment — visible to anyone, forever," Miden said in a blog post announcing the launch on Aug. 12.

USDCx is backed by USDC deposited in an xReserve smart contract, with each token redeemable 1:1. Users can selectively disclose information such as balances or source of funds to auditors, regulators or counterparties when required. USDC had a market capitalization of about $72.22 billion as of Aug. 12, with roughly 72.25 billion in circulation and 1.139 billion unreleased, per DefiLlama.

Miden positions USDCx as the foundational asset of its "PriFi" ecosystem targeting institutional trading, B2B payments, payroll, cross-border remittances and corporate treasury management. The launch follows a July 1 transaction on the Canton Network where Tradeweb paired a tokenized U.S. Treasury with USDCx, with Franklin Templeton transferring the security to Virtu Financial.

Privacy by default, disclosure on demand

Miden is a California-based zero-knowledge blockchain that uses client-side proving, executing and verifying transactions on user devices rather than exposing them to the network. This architecture lets applications keep data private by default while proving specific facts when needed.

The design targets the transparency problem that has kept public blockchains out of institutional finance. On public ledgers, a company's cash flows and counterparty information can be visible to competitors, a barrier for payroll, treasury and supplier payments.

Circle's xReserve lets blockchains issue USDC-backed representations without relying on third-party bridges. USDCx is one of the early use cases of the framework, which Miden said supports payments and other financial applications where transaction confidentiality matters.

Institutional use case already tested

The planned launch follows a real-world institutional transaction on Canton. On July 1, Tradeweb completed a real-time settlement pairing a tokenized U.S. Treasury with USDCx, using Canton's synchronized settlement infrastructure. Franklin Templeton transferred the tokenized Treasury to Virtu Financial while Tradeweb handled execution and price discovery.

Miden spun out from Polygon as an independent project in April 2025 and counts a16z crypto, 1kx and Hack VC among its backers. USDCx is scheduled to launch simultaneously with the Miden mainnet later this month.

The move comes as stablecoin issuers explore adding functionality beyond simple value transfer. Privacy features could appeal to businesses protecting sensitive financial information, though they raise questions about anti-money-laundering oversight. Miden's selective-disclosure model aims to balance confidentiality with the compliance requirements of regulated finance, a test that could shape how stablecoins are designed as zero-knowledge technology moves toward mainstream use.

This article is for informational purposes only and does not constitute investment advice.