A New Infrastructure for Onchain Finance
Circle Internet Group (NYSE: CRCL) officially launched the public mainnet of Arc on September 16, 2026, positioning the platform as an “economic operating system” built specifically for the intersection of traditional finance and the emerging AI-driven agentic economy. According to Circle, the Layer 1 blockchain is designed to handle high-frequency financial activities, including real-time money movement and tokenized asset issuance, with a focus on sub-second settlement and institutional-grade security.
The network launches with a significant cohort of founding validators, including major global financial infrastructure players like BlackRock, The Depository Trust & Clearing Corporation (DTCC), Visa, Mastercard, and ICE. Unlike many public blockchains, Arc utilizes a permissioned validator model aimed at meeting the regulatory requirements of global banks and asset managers, while maintaining the open nature of blockchain technology.
Design Choices for Institutional Adoption
Circle’s technical design for Arc addresses several friction points commonly associated with current blockchain infrastructure. Fees are paid in USDC rather than a volatile native token, providing cost predictability for enterprises. Furthermore, the network supports post-quantum signatures and offers opt-in privacy features, which Circle claims are currently in development for a network-wide release to balance business confidentiality with auditability.
The platform is also specifically engineered for “agentic economic activity.” As AI agents increasingly manage trades, liquidity, and contracts, Arc provides the infrastructure for these agents to function as economic actors. According to Circle, USDC accounts for 98.8% of current agent-driven transaction volume, making the Arc mainnet a logical evolution for this specific class of participant. The integration of the Circle Agent Stack allows developers to deploy policy-controlled wallets and conduct nanopayments.
A Broad Ecosystem of Builders
The launch includes support from over 100 institutional and ecosystem builders. Major financial institutions, including BNY, HSBC, and State Street, have gained access to the network to explore treasury management and confidential payments. In the trading and liquidity sector, protocols such as Uniswap, Aave, and Morpho are anchoring the network’s onchain credit markets. Additionally, custody providers like BitGo and Fireblocks have confirmed support, ensuring that institutional users have secure methods to manage their digital assets on the new chain.
The move represents a significant step in the maturation of digital asset infrastructure. As noted by Decrypt, the involvement of legacy financial firms like the DTCC underscores a shift toward using public, yet controlled, blockchain environments for core financial operations.