$USDC USDC (USD Coin) is a regulated stablecoin pegged 1:1 to the U.S. dollar, issued by Circle. It's backed by cash and U.S. Treasuries, audited monthly, and widely used for trading, payments, and DeFi. Available on 15+ blockchains, USDC offers fast, low-cost, and transparent transactions. It’s the second-largest stablecoin globally with strong regulatory compliance and growing adoption.