Circle has opened bitcoin-backed borrowing for institutional clients on its new Arc blockchain, letting Circle Mint customers deposit bitcoin, mint the cirBTC token and borrow USDC against it without selling their holdings. The service, called Digital Asset-Backed Borrowing, went live on September 21 alongside cirBTC landing on Arc, the layer 1 network Circle launched in public mainnet on September 16.
The mechanics are straightforward. An eligible client deposits bitcoin and receives cirBTC, a token Circle says is backed one-to-one by native bitcoin held in segregated, bankruptcy-remote accounts at Circle National Trust Bank, a federally chartered custodian. The cirBTC then goes to a third-party lending market as collateral. The client borrows USDC into their Circle Mint balance and keeps the price exposure to bitcoin the whole time. Repayment works in reverse: USDC sent from Circle Mint pays down the debt, and the collateral is freed according to the rules of the underlying protocol.
How the collateral is verified
Circle is betting that verifiability is the selling point. Reserves sit in disclosed bitcoin addresses, and Chainlink proof of reserve publishes reserve data onchain through decentralized oracles, so any counterparty can check the backing in real time instead of waiting for a monthly attestation. The model connects three observable data points: the bitcoin in the disclosed reserve addresses, the onchain reserve value published through Chainlink, and the cirBTC supply issued on supported blockchains. When cirBTC is redeemed, the tokens are burned and the bitcoin is released through the redemption process.
Morpho is the first lending protocol supported, with Aave and others planned as the product develops. Circle is explicit about what it does and does not do: it does not lend, it does not set rates, and it does not control liquidations. Interest rates, collateral limits and liquidation thresholds are set by whichever lending market the client picks. Assets placed in the Smart Wallet used for borrowing sit outside the regulated activities of Circle Mint, per the terms of service.
There is one notable exclusion. Clients based in New York cannot use the service, an echo of the long-standing posture of that state toward crypto lending products. Availability is otherwise gated by the Circle Mint onboarding process, which serves institutions rather than retail traders.
Why Circle wants bitcoin on its chain
The business logic is about idle capital. Institutions holding bitcoin have historically had two options: sell and lose exposure, or use centralized credit desks with opaque terms. Tokenized bitcoin on a chain Circle controls, paired with USDC borrowing, turns a static treasury position into working collateral. Circle pitches this as the core workflow of Arc, which it describes as an economic operating system for stablecoin finance.
Arc itself went live with more than 100 institutional builders on day one, including BlackRock, which is expected to deploy its BUIDL tokenized fund on the network. Circle is also working with DTCC on tokenizing DTC-custodied assets starting in 2027. The chain uses USDC as its native gas asset, which ties every transaction on it back to the stablecoin that generates most of the revenue at Circle. For Circle, every dollar of borrowing activity on Arc is also a dollar of USDC throughput.
cirBTC is the second major Circle-issued token after USDC and the euro-pegged EURC. Supply remains small for now, roughly 40 tokens against about 42.5 bitcoin in reserve in early September, but the product is days old and aimed at large balance sheets rather than retail volume. The multichain plan matters too: cirBTC is live on Ethereum and Arc first, with crosschain support handled through the Cross-Chain Transfer Protocol between those two networks.
A competitive and regulated corner
Bitcoin-backed lending is getting crowded. Coinbase added fixed-rate bitcoin loans to retail users this week through Morpho Midnight on Base, its own Ethereum layer 2. MoonPay agreed to acquire North Capital, an SEC-registered broker, to build tokenized securities infrastructure. The difference with Circle is the regulatory posture: the collateral sits with a federally chartered trust bank, the reserve data is machine-readable onchain, and the borrower interface is a compliance-gated institutional product.
The timing matters too. Bitcoin has been volatile, swinging between roughly $76,000 and $87,000 in the past month while US spot bitcoin ETFs took in close to $1 billion in a single day earlier this week. Institutions that want dollar liquidity without giving up bitcoin exposure have few regulated ways to get it. Circle is positioning cirBTC borrowing as exactly that, with the paperwork to match.
There are risks worth naming. Wrapped assets live or die on trust in the issuer and the custody arrangement, which is why Circle leans so hard on the Chainlink verification and the trust bank charter. And the borrowing itself happens in permissionless lending markets, where liquidations execute at market speed regardless of who the borrower is. An institution that mismanages its collateral ratio faces the same fate as any DeFi user.
Whether institutions adopt it at scale depends on two things the launch does not settle: how deep the lending markets on Arc get, and how the terms compare with simply borrowing from a bank or a prime broker. Circle has built the rails and the transparency layer. Usage will decide the rest.
Counterparty demand is the part Circle cannot build alone. A wrapped token is only as useful as the places that accept it, and the roadmap makes that explicit: Aave integration is next, with more lending markets to follow. Each new venue multiplies the number of ways an institution can put cirBTC to work, from simple borrowing to structured trades that combine bitcoin exposure with dollar yield. The Circle Mint API also means the workflow can be automated, minting and redeeming cirBTC as treasury needs shift without manual intervention.
The broader context is a market where tokenized collateral is moving from experiment to infrastructure. The CFTC has been running a consultation on accepting tokenized assets, including stablecoins, as margin in derivatives markets, and the SEC and CFTC have both signaled support for tokenization through their joint harmonization work. If regulators settle on clear rules, the pool of institutions willing to hold bitcoin as a balance-sheet asset, and to borrow against it, grows accordingly. Circle is building for that outcome rather than waiting for it.