Circle launches Arc mainnet with more than 100 institutions testing a new Layer 1 for stablecoin payments

Circle has taken Arc, its Layer 1 blockchain for stablecoin payments and other financial transactions, live on September 16, with more than 100 applications at launch and more than 100 institutional and ecosystem builders already involved. For PSPs and other high-risk payment players, the point is not the chain itself so much as who is validating it: BlackRock, Visa, Mastercard, DTCC, ICE, Standard Chartered, Sumitomo Corporation, SBI Group, MoneyGram, Galaxy, and Worldpay (now Global Payments) are part of the founding validator cohort.

1. Circle says Arc Mainnet went live on September 16. The company described Arc as the biggest launch in its history since USDC, and said the network is meant for stablecoin payments and other financial transactions rather than retail crypto speculation dressed up in better branding.
2. At launch, Circle reported more than 100 applications and more than 100 institutional and ecosystem builders. The founding validator cohort includes BlackRock, Visa, Mastercard, DTCC, ICE, Standard Chartered, Sumitomo Corporation, SBI Group, MoneyGram, Galaxy, and Worldpay (now Global Payments), which means these firms are involved in operating the network, not merely integrating with it.
3. Arc is designed around bank-facing features: sub-second, deterministic finality, so a confirmed transaction cannot be reversed or re-ordered; opt-in privacy with an audit trail; and a permissioned validator set rather than open participation by anonymous nodes. In other words, the architecture is built to fit compliance requirements, which is the detail PSPs will care about first.
4. The network is fully compatible with Ethereum’s existing developer tools, so applications built for other Ethereum-based chains can run on Arc without being rewritten from scratch. That lowers the migration friction for teams already working with Ethereum tooling and trying to move into a more controlled settlement environment.
5. Arc also plugs into Circle’s existing stack: USDC and EURC, the new StableFX feature, and Circle Payments Network. StableFX is live and offers 24/7 cross-currency settlement between more than 20 regional stablecoins, while network fees on Arc are paid in USDC rather than a separate native token.

For high-risk operators, the relevant signal is that Circle is packaging settlement, FX, and cross-border transfers into one network and putting known financial institutions on the validator side. That is a different sales pitch from “here is another chain”; it is closer to “here is infrastructure that institutions may actually be willing to touch.”