Circle has launched Arc as a public mainnet on September 16, creating a blockchain environment where USDC holders can use the same balance for both payments and network fees. The move addresses a common friction point in stablecoin adoption: on most Ethereum-compatible chains, users must acquire a separate token to pay transaction costs even when holding sufficient USDC for their intended payment.
Arc operates as a layer-1 blockchain with an Ethereum-compatible environment designed specifically around stablecoin transactions. Transactions are expected to finalize in less than a second, and developers can use familiar Ethereum tools while building applications where spending and fees are denominated in the same asset.
The network combines permissionless application development with a permissioned validator set. Circle's announced founding validators include BlackRock, DTCC, Visa, Mastercard, and Standard Chartered alongside financial institutions, placing institutional participation within the network's core operating design.
The public mainnet launch follows a private network phase in August that Circle said included more than 100 ecosystem and institutional builders. Arc's public testnet had opened on October 28, 2025.
Simplifying Stablecoin Use
By consolidating payments and fees into a single USDC balance, Arc aims to streamline onboarding and balance management for payment applications. The design ensures USDC plays an operational role in every fee-paying transaction on the network, beyond simply being an asset that applications choose to support.
Circle's documentation clarifies that USDC's native and token interfaces represent the same underlying holding, preventing wallet software from displaying them as separate pots of money that could confuse users about their actual balance.
Market Context
As of the end of June, Circle reported $73.3 billion of USDC in circulation, compared to approximately $184.6 billion of USDT issued by Tether in the same period. Arc represents Circle's strategy to increase USDC adoption by creating use cases that encourage users to maintain funds in the stablecoin.
However, additional activity on Arc and growth in USDC demand represent different outcomes. Moving existing USDC balances from other chains to Arc or paying fees in USDC establishes uses for the token without necessarily expanding the overall market for it. The effectiveness of the mainnet launch will depend on whether easier transactions encourage users to bring additional capital into USDC and continue using it over time.
