Morpho enables cirBTC deployment on Arc lending markets

Circle’s Arc blockchain went live with Morpho baked in as its primary lending engine, and the results were immediate. Day-one deposits surpassed $150 million across USDC and EURC vaults, all borrowing against cirBTC, Circle’s 1:1 Bitcoin-backed wrapped token.

How the cirBTC-Morpho setup works

The core idea is straightforward: hold Bitcoin, don’t sell it, and still access liquidity. cirBTC represents a claim on actual BTC held in segregated custody, which means holders can deposit it as collateral on Morpho’s lending markets and borrow USDC or EURC against it.

Morpho Blue, the protocol’s permissionless lending layer, handles the variable-rate earn and borrow positions. It also integrates with APIs designed for fintech applications. Chainlink’s proof-of-reserves system verifies that the underlying BTC actually exists in custody.

The supply of cirBTC on Ethereum was limited to roughly 40 BTC outstanding as of mid-August, suggesting the real action was always intended to happen on Arc itself rather than on existing chains.

Why Arc chose Morpho over building from scratch

Morpho’s architecture allows for isolated markets with customizable risk parameters. The validator set for Arc includes BlackRock, DTCC, and Visa among the institutional validators securing the network.

Arc uses USDC for gas fees, which eliminates the friction of needing a native token just to transact.

The $150M question: is this sustainable demand?

Morpho Midnight, a fixed-rate lending product, is reportedly in the pipeline for Arc. Institutional treasuries strongly prefer predictable borrowing costs, and the absence of fixed-rate options has been one of the persistent gaps keeping traditional finance from engaging more deeply with onchain lending.

The next metrics worth watching are utilization rates on Morpho’s cirBTC vaults, the pace of new cirBTC minting, and whether fixed-rate products through Morpho Midnight attract a different class of borrower than the variable-rate markets currently serve.

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