$USDC USDC (USD Coin) is a popular stablecoin pegged to the US Dollar at a 1:1 ratio, meaning 1 USDC is designed to always equal 1 USD. It is issued by Circle and backed by fully reserved assets, including cash and short-term U.S. Treasury bonds. USDC is widely used in cryptocurrency trading, decentralized finance (DeFi), and cross-border payments. As an ERC-20 token on Ethereum and other blockchains, it offers high liquidity and fast transactions. Coin pairs involving USDC, such as BTC/USDC or ETH/USDC, are favored for their stability, helping traders avoid volatility while moving funds or making strategic trades.