Circle's Arc blockchain launched with Morpho integrated as its primary lending engine, drawing $150 million in deposits on its first day across USDC and EURC vaults. Borrowers are using cirBTC, Circle's 1:1 Bitcoin-backed wrapped token, as collateral for these loans.
How the cirBTC-Morpho setup works
cirBTC represents a claim on actual Bitcoin held in segregated custody. Holders can deposit cirBTC as collateral on Morpho's lending markets and borrow USDC or EURC against it, allowing Bitcoin holders to access liquidity without selling their position.
Morpho Blue, the protocol's permissionless lending layer, manages variable-rate earn and borrow positions and integrates with APIs for fintech applications. Chainlink's proof-of-reserves system verifies that the underlying Bitcoin exists in custody.
The supply of cirBTC on Ethereum was limited to roughly 40 BTC outstanding as of mid-August, suggesting the primary deployment was intended for Arc itself rather than existing chains.
Arc's choice of Morpho
Morpho's architecture supports isolated markets with customizable risk parameters. Arc's validator set includes BlackRock, DTCC, and Visa among institutional validators securing the network.
Arc uses USDC for gas fees, eliminating the need for a separate native token to transact on the network.
What comes next
Morpho Midnight, a fixed-rate lending product, is reportedly in development for Arc. Institutional treasuries typically favor predictable borrowing costs, and the absence of fixed-rate options has been a barrier to deeper traditional finance participation in onchain lending.
Key metrics to monitor include utilization rates on Morpho's cirBTC vaults, the pace of new cirBTC minting, and whether fixed-rate products through Morpho Midnight attract borrowers seeking alternatives to variable-rate markets.
