Stablecoin issuer Circle added Aave V4 to its institutional borrowing product on Oct. 6, with the Arc launch configuration capping cirBTC supply at 1,100 tokens and borrows at 220 cirBTC against a 78% loan-to-value threshold.

The USDC issuer confirmed the integration from its verified X account the same day. "@aave markets are now supported in Circle Mint's Digital Asset-Backed Borrowing product," the post read. Eligible Circle Mint LLC customers can deposit BTC, mint Circle's wrapped bitcoin token cirBTC and borrow USDC through supported third-party markets on either Arc or Ethereum mainnet.

How does the integration extend existing Mint borrowing?

The Aave venue sits alongside a Morpho-based service that Circle introduced in September. The Aave addition broadens that menu without changing Circle's role: the company does not lend from its balance sheet. Circle's product documentation states that borrowed USDC originates from market lenders on the underlying protocol.

Circle's terms reinforce that division of risk. Customers remain exposed to protocol-driven liquidation, and Circle explicitly disclaims any guarantee of the amount or availability of residual collateral recovery after a liquidation event. Liquidation can occur without notice to the borrower.

Arc, the enterprise-focused layer-1 network developed by Circle, hosts both lending venues. Aave Labs confirmed on Sept. 16 that Aave V4 on Arc had activated with cirBTC among its launch reserves, paving the way for the Mint integration three weeks later.

What collateral and liquidity parameters apply on Aave?

Aave's published Arc launch configuration sets a 78% collateral factor for cirBTC in the Main Spoke, the general-purpose lending market connected to Aave's shared liquidity hub. A maximum liquidation bonus of 7.22% applies, with the exact figure scaling to a position's health at execution.

Supply and borrow caps for cirBTC remain narrow. The configuration sets an Add Cap of 1,100 cirBTC and a Draw Cap of 220 cirBTC on the wrapped bitcoin asset. The Main Spoke separately carries a 56 million USDC supply cap and a 51 million USDC borrow cap. The USDC ceiling is the binding constraint for institutional drawdowns.

For comparison, the Morpho cirBTC market on Arc carried an 86% liquidation LTV on Sept. 21, with $177 million of supplied USDC and $14.3 million of outstanding borrowings backing 287 cirBTC of collateral. Morpho offers both higher leverage and substantially more existing liquidity than the newly activated Aave market.

What risks did risk assessors flag?

The new venue does not eliminate the wrapper's issuer dependencies. Aave risk service provider LlamaRisk published a Sept. 18 assessment identifying concentrated trading liquidity on Arc and Circle-controlled privileged contract roles operating without timelocks. Those structural features represent the core operational risks of the cirBTC listing according to the assessor.

Aave's governance forum records the protocol as the final decision-maker on listing parameters. The launch configuration — collateral factor, liquidation bonus and caps — remains subject to Aave governance action through the standard proposal process.

What changes for Mint clients operationally?

Institutional Mint clients can now route the same cirBTC collateral to either Morpho or Aave V4 from a single Circle interface. They can choose between an 86% LTV market with established liquidity and a 78% LTV market with lower immediate capacity.

The 220 cirBTC Draw Cap constrains how quickly new borrows can ramp on Aave, and the 7.22% maximum bonus raises the cost of any forced unwind. Aave's governance forum shows the launch parameters remain subject to revision through the protocol's standard proposal process as the Arc deployment matures.