Circle Internet Group (NYSE: CRCL) launched the public testnet for Arc, a Layer-1 blockchain designed to integrate programmable money with real-world economic activity, on October 28, 2025. The testnet has attracted participation from over 100 institutions across global finance and technology sectors, including BlackRock, Visa, and Amazon Web Services. The network offers predictable dollar-based fees, sub-second transaction finality, and direct integration with Circle's platform.