Circle Opens Bitcoin-Backed USDC Borrowing in Mint

Circle said Monday that eligible Circle Mint customers can borrow USDC against bitcoin without selling their BTC holdings, routing collateral through third-party lending markets on Arc and Ethereum. The stablecoin issuer announced Digital Asset-Backed Borrowing in a Sept. 21, 2026 blog post and tied the rollout to cirBTC going live on Arc the same day.

Under the workflow Circle described, a customer deposits BTC into Mint, mints Circle Wrapped Bitcoin, supplies cirBTC as collateral through supported lending protocols, and receives borrowed USDC back into the Mint balance. Circle said the borrows are overcollateralized and that rates, loan-to-value limits, and liquidation rules are set by the third-party markets rather than by Circle itself. Collateral moves into a customer-controlled smart wallet for protocol interaction, then USDC returns to Mint when a borrow executes.

Morpho is the first supported lending venue, according to Circle's post and coverage from Cointelegraph on Monday. Circle said it plans to add Aave and other protocols over time. On Arc, Circle pointed to competitive USDC borrow rates at launch subject to utilization and governance parameters. On Ethereum, the company highlighted Morpho's existing institutional activity as the initial integration point.

Circle Wrapped Bitcoin is a one-to-one wrapped token redeemable for native BTC through Mint workflows, as Circle explained in a Sept. 11 post on collateral design. Reserves sit in Circle's custody stack, and the product is positioned as plain wrapped bitcoin rather than a staked or derivative BTC instrument. Pairing cirBTC with USDC lets borrowers access dollar liquidity while keeping BTC exposure, Circle said Monday.

The Arc network blog said cirBTC went live on Arc on Sept. 21 alongside the borrowing feature for Mint users. Arc is Circle's chain focused on stablecoin finance, while Ethereum gives access to established lending pools. Circle's legal terms for Digital Asset-Backed Borrowing, dated Sept. 16, 2026, describe automated transfers between Mint balances and smart wallets when users borrow or repay through the integrated front end.

New York Mint clients are excluded from the offering, Cointelegraph noted in its Monday report. That geographic carve-out matters because Circle Mint already segments products by jurisdiction. For eligible institutions, the pitch is treasury continuity: BTC can remain a long-term holding while USDC covers operating liquidity, payroll, or trading needs funded through onchain credit.

Circle's launch follows other institutional attempts to lend against custody-held bitcoin. Cointelegraph compared the model to Lombard's partnership with Bitwise announced in March 2026, which aimed to borrow against custodied BTC without wrapping. Circle's path converts deposited BTC into cirBTC for DeFi collateral instead of keeping the loan tied to raw custody units inside a single vault.

Circle did not publish initial borrow volumes or a list of launch customers. The Sept. 21 post emphasized workflow integration inside Mint rather than new underwriting by Circle itself. Any liquidation or rate spike would flow from Morpho or future protocols, not from Circle setting credit terms directly.

For bitcoin-heavy treasuries, the product adds a Mint-native on-ramp to onchain credit markets that were already active on Ethereum. Whether institutions adopt it at scale depends on cirBTC liquidity, Morpho parameters, and how borrow rates compare with offchain credit lines they already use.

Circle's Sept. 16 legal terms for Digital Asset-Backed Borrowing spell out that Mint acts as a pass-through for collateral movement rather than as a lender of record. That structure keeps credit risk on the integrated protocols while Circle handles custody, minting, and the smart-wallet handoff described in Monday's blog post. Institutions already using Morpho through other front ends could in theory supply the same cirBTC collateral, but Circle is pitching the Mint UI as the consolidated funding and repayment surface for treasury teams.

Arc's role is to host cirBTC and USDC-native lending pools where Circle controls more of the stack. The Arc blog post tied cirBTC launch to borrowing on the same calendar day, signaling that Circle wants stablecoin issuance, wrapped bitcoin, and credit to move as one product story rather than as disconnected DeFi integrations. Ethereum support keeps access to Morpho's existing liquidity on the chain where most institutional DeFi activity still settles.

Market watchers will look at utilization rates on Morpho markets accepting cirBTC and at whether borrow spreads tighten as supply grows. Circle did not publish APY tables in its launch post, and Morpho governance can change parameters without Circle's involvement. If cirBTC liquidity stays thin, borrowers may face higher effective rates or limited borrow capacity even when BTC collateral is ample in Mint custody.