USDC
Circle's fully-reserved, regulated dollar stablecoin — DeFi's deepest lending liquidity.
USDC is a US dollar-backed stablecoin issued by Circle Internet Group and regulated as a money transmitter under US state law, with Paxos serving as a key issuance partner on select chains. Reserves consist of cash and short-duration US Treasuries held in segregated, bankruptcy-remote accounts, with monthly attestation reports published by Grant Thornton (Circle transparency portal). Circle's Cross-Chain Transfer Protocol (CCTP) enables native burn-and-mint bridging across 15+ chains without wrapped token risk, making USDC the most bridge-portable stablecoin in DeFi. It is the single largest supply-side asset in DeFi lending, concentrated in Aave V3 and Morpho markets across Ethereum, Base, and Arbitrum (DeFiLlama, April 2026).
- Approximately $78B in circulating supply as of Q1 2026 (Circle / DeFiLlama stablecoins page), up from ~$25B at end-2023.
- Deepest DeFi lending depth of any stablecoin: largest supply-side asset on Aave V3, Compound V3, Morpho, Spark, and Fluid across Ethereum, Arbitrum, Base, and Optimism.
- CCTP v2 introduced sub-minute finality bridging on supported chains in 2025, replacing the longer attestation window of CCTP v1.
- In September 2025, Coinbase routed retail BTC-backed USDC loans through a Morpho Vault curated by Steakhouse Financial, pulling over $1.6B in collateral into Morpho-Blue cbBTC markets by April 2026 (Morpho blog, The Block).
- Circle obtained a US OCC trust charter in December 2025, putting USDC reserves under federal oversight rather than state-level money-transmitter rules — the most significant regulatory milestone for a US stablecoin.
Frequently asked questions
Is USDC safe to hold in DeFi lending markets?
USDC itself carries Circle's reserve risk (US Treasuries, generally very low) plus the smart-contract risk of whichever lending protocol you deposit into. The March 2023 Silicon Valley Bank incident briefly depegged USDC to ~$0.87 when $3.3B of reserves were temporarily inaccessible, underscoring that reserve risk is real even for blue-chip stablecoins. Depositing into lending protocols adds an additional layer of protocol-level risk above USDC's issuer risk.
Can Circle freeze my USDC?
Yes. Circle retains the ability to blacklist addresses on-chain and freeze USDC balances in response to regulatory orders or fraud. This has occurred for sanction-compliance and law-enforcement purposes. If you deposit USDC into a lending protocol, Circle's freeze capability applies to USDC in the protocol's smart contract address, not to your specific position within the contract.
Why are USDC borrow rates sometimes lower than USDT rates?
USDC has significantly deeper supply in DeFi lending markets than USDT, partly because USDC's CCTP makes it the easiest stablecoin to move cross-chain. More supply at similar utilization means rates are typically compressed. USDT tends to carry a small rate premium because its DeFi supply is thinner outside of Tron, which means borrowers on Ethereum and L2 markets face less competition for the available USDT float.