$USDC USDC is a US dollar stablecoin, with total supply divided among Coinbase, Circle, and other platforms. Coinbase's share has rapidly increased to about 23% by Q1 2025, reflecting its stronger market influence. For USDC on the platform, Circle and Coinbase each retain 100% of reserve income, while outside the platform, it is split 50/50, with Circle benefiting more from external sources. In addition, Circle expands coverage of local USDC through worldwide chains, upgrades bring higher security, liquidity, and integration, and it has also deployed CCTP V2 to enhance interoperability.