Circle launched Arc’s public mainnet on September 16, bringing its stablecoin-focused Layer 1 into production with USDC transaction fees, sub-second finality and more than 100 applications available on day one. Arc is built for financial markets, real-time payments, foreign exchange, tokenized assets and automated transactions involving AI agents. The network moves from a private mainnet that included more than 100 institutional and ecosystem builders into a public environment accessible to developers and users.