Circle Arc Launches as CLARITY Act Fails
The CLARITY Act, a key piece of legislation aimed at regulating stablecoins and digital assets, failed to pass the U.S. Senate on September 15, 2026, with Polymarket odds for passage dropping to 15% from approximately 90% in February. The day after, on September 16, Circle’s Arc mainnet went live, marking a significant shift in the industry’s approach to regulation and infrastructure development.
Arc is an open Layer-1 blockchain designed to support sub-second finality and a permissioned validator set. The founding validators include major financial institutions such as BlackRock, DTCC, Visa, and Mastercard, among others. These institutions are not merely sponsors but operators securing the network.
BlackRock, for instance, plans to deploy its $3.2 billion tokenized liquidity fund, BUIDL, on Arc, using native USDC for 24/7 subscription and redemption. Robert Mitchnick, BlackRock’s Global Head of Digital Assets, emphasized the importance of purpose-built networks like Arc for supporting faster settlement and broader institutional adoption of digital assets.
The DTCC, custodian of over $114 trillion in assets, is collaborating with Circle to tokenize DTC-custodied assets on Arc, with limited production trades beginning in July 2026 and a full launch scheduled for October. Frank LaSalla, DTCC President and CEO, noted that open, interoperable networks like Arc provide market participants with flexibility and choice while meeting rigorous compliance standards.
The failure of the CLARITY Act and the subsequent launch of Arc highlight a structural pivot in the industry, moving away from legislative frameworks toward infrastructure-led regulation. With the GENIUS Act’s enforcement date set for January 18, 2027, the technical specifications of platforms like Arc are dictating compliance standards, regardless of legislative action.
“As stablecoins and other digital assets move into real-world payments, settlement, and treasury flows, Mastercard is focused on helping customers operate across an increasingly diverse payments ecosystem,” said Jorn Lambert, Mastercard’s Chief Product Officer, emphasizing the role of validators as infrastructure providers.
The launch of Arc and the subsequent deployment of major financial assets on the platform signal a new phase of regulation by infrastructure, where the technical standards set by validators become the de facto compliance standards for the industry.
