Circle launched Arc mainnet on September 16, moving its blockchain for payments and tokenized financial markets into public operation. Arc's official website now identifies the platform as live, matching the launch date Circle announced in August and CoinDesk's reporting on Wednesday.

The network charges transaction fees in USDC, rather than requiring users to acquire a volatile native token for gas. Arc advertises sub-second finality and operates with a permissioned validator set. Circle's announced founding cohort includes BlackRock, DTCC, Mastercard, Standard Chartered and Visa alongside Circle and other operators.

That combination is central to its institutional pitch: applications can use stablecoin-denominated fees while settlement is secured by identified operators. Public access to applications should not be confused with permissionless participation in network validation.

Arc's launch website also presents a broader developer stack. Arc Portal provides an entry point to ecosystem applications, Arc Studio offers AI-assisted application and smart-contract creation, and App Kits packages tools for payments, crosschain transactions and agent workflows. These are product offerings, not evidence of transaction volume or widespread adoption.

Some institutional integrations remain future work. Circle's August announcement placed its planned connection to DTCC's tokenization service in the second half of 2027. It should not be treated as a completed launch-day capability.

The immediate development is therefore concrete but narrower than the platform's long-term ambitions: Circle now has a live settlement network around its stablecoin infrastructure. Whether institutions turn participation and integration plans into sustained usage remains the next test.