Circle, known for its stablecoin USDC, has announced a significant shift by launching its own blockchain, Arc, which raised $222 million in a token presale led by Andreessen Horowitz. This move positions Circle not just as a stablecoin issuer but also as the operator of the infrastructure that supports its currency. This dual role raises critical regulatory concerns, particularly regarding the potential for conflicts of interest, as Circle would control transaction ordering and fees on a network that its competitors must use. The GENIUS Act, which governs stablecoins, does not address the implications of an issuer owning its own settlement network, leaving a gap in regulatory oversight. Major investors like BlackRock and Apollo are backing Arc, viewing it as essential financial infrastructure. As Circle seeks to compete with larger players like Tether, the need for regulatory measures to ensure fair practices and transaction neutrality becomes urgent. The window for regulators to intervene is closing as Arc progresses toward a mainnet launch, making it crucial to establish rules that prevent structural conflicts before they become entrenched.