Circle is built on multiple blockchains. Initially, Circle launched USDC on the Ethereum blockchain, which served as its primary foundation. However, Circle has expanded the availability of USDC to other blockchains to enhance accessibility and offer greater flexibility to users. As of now, USDC is natively available on multiple blockchains, including Ethereum, Algorand, Solana, Stellar, Avalanche, and others. This multi-chain approach allows users to choose the blockchain that best suits their needs while still enjoying the benefits and utility of USDC.