No, USDC is not only limited to the Ethereum blockchain. While USDC was initially launched as an ERC-20 token on the Ethereum network, it has expanded to other blockchain platforms as well. USDC is now available on multiple networks, including Polygon, Solana, Arbitrum, and other blockchains. This multi-chain approach enables users to access and utilize USDC on different blockchain ecosystems, providing greater flexibility and interoperability.