Circle Puts Bitcoin-Backed USDC Loans on DeFi Rails

Circle has launched Digital Asset-Backed Borrowing, a service letting eligible institutional Circle Mint customers convert Bitcoin holdings into USDC liquidity without selling the underlying BTC, according to Circle. Customers deposit Bitcoin, mint Circle’s wrapped token cirBTC, and supply it as collateral to third-party onchain lending markets to borrow USDC directly into their Circle Mint balance.

How Digital Asset-Backed Borrowing works

The mechanics are straightforward on paper: an eligible customer deposits native Bitcoin, mints cirBTC at a 1:1 rate, and supplies that token as collateral to supported lending markets on Arc or Ethereum. Morpho is the first lending protocol Circle has connected to the service, with Circle saying it plans to add Aave and other protocols over time – a pattern similar to how other institutional crypto-backed loan structures route collateral through third-party venues rather than lending it in-house.

Once the position is open, borrowed USDC settles directly into the customer’s Circle Mint balance. Critically, Circle does not set the borrowing rate, the collateral requirement, or the liquidation threshold – those terms are determined entirely by the third-party lending market a customer chooses. Positions are overcollateralized, and the cirBTC collateral sits in a customer-controlled wallet supplying the DeFi protocol rather than being lent directly by Circle. New York clients are excluded from the service.

cirBTC itself isn’t new. Circle first launched the token on Ethereum in June, and the institutional borrowing rollout coincides with cirBTC going live on Arc this week. Each cirBTC is backed 1:1 by Bitcoin held in custody by Circle National Trust, and reserves are verifiable onchain.

A market snapshot cited by CryptoSlate showed the Arc market for USDC loans against cirBTC running an 86% liquidation loan-to-value limit on launch day, with $14.13 million borrowed against $162.85 million in available liquidity and a $176.99 million market size – a 7.98% utilization rate. That’s a single point-in-time reading rather than a steady-state figure, and it doesn’t extend to the separate Ethereum market, but it confirms the rails were live and taking borrows from day one.

Institutional crypto-backed lending expands

Circle’s move slots into a broader pattern of custodians and issuers building crypto-collateralized credit rails for institutions that don’t want to touch spot markets to raise dollars. In February, Anchorage Digital partnered with Kamino to let institutions borrow against staked Solana held at Anchorage Digital Bank, keeping the collateral inside qualified custody while accessing onchain liquidity – a structure comparable to the revolving credit lines now built around Bitcoin and Ethereum collateral elsewhere in the market.

Bitcoin-specific models followed in March. Lombard partnered with Bitwise on a system for borrowing against custodied BTC, with Morpho again supplying the lending infrastructure. The key distinction from Circle’s approach: Lombard’s system kept the underlying Bitcoin in custody without wrapping or bridging it, whereas Circle’s model converts deposited BTC into cirBTC before it ever touches a lending market. BitGo also expanded its own institutional lending platform in March, launching a portfolio-based financing product that lets multiple liquid, staked, and locked crypto assets serve as collateral rather than requiring collateral posted per individual loan.

Who carries the risk

The role split here matters for any treasury desk evaluating the product. Circle issues the cirBTC wrapper, custodies the underlying Bitcoin through Circle National Trust, and credits borrowed USDC to the Mint balance. Everything downstream of that – the rate, the collateral factor, the liquidation trigger – belongs to whichever third-party market the customer selects, not to Circle.

That’s a meaningful distinction from a bank loan: the position can be liquidated by the lending protocol even though the customer never sold their Bitcoin and Circle isn’t underwriting the credit. Positions remain overcollateralized and collateral sits in a customer-controlled wallet rather than a Circle-managed pool, and New York clients remain excluded from the service entirely. The launch also lands just days after Circle rolled out the Arc mainnet, its layer-1 chain built around USDC as the native gas token and already supporting tokenized assets including BlackRock’s BUIDL and Circle’s own USYC.

What comes next

Circle has said it plans to add Aave alongside additional lending protocols beyond Morpho, though that expansion hasn’t gone live yet. For now, availability is limited to supported markets on Arc and Ethereum, and how far the product scales will depend on how many protocols and networks Circle plugs in next.

The timing isn’t incidental. Digital Asset-Backed Borrowing arrives right behind Arc’s mainnet launch, and Circle is clearly positioning the chain as the home base for stablecoin-denominated institutional finance – payments, tokenized funds, and now BTC-collateralized credit, all settling through the same USDC rails.

Source: Cointelegraph

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