Circle Arc Mainnet Launches With USDC Paying Gas Fees

Every general-purpose blockchain has asked its users to hold two assets: the thing they actually want, and a volatile native token to pay for moving it. For a treasury desk, that second requirement is an accounting problem dressed up as a technical one. Circle opened the public mainnet of Arc on September 16, 2026 with a different answer — gas is denominated in USDC.

• Arc public mainnet went live September 16, 2026 as an EVM-compatible Layer 1 with gas fees paid in USDC
• Eleven founding validators, joining in phases, include BlackRock, DTCC, ICE, Mastercard, Visa and SBI Group
• More than 100 applications are live at launch, among them Aave V4 lending, Morpho and Uniswap
• Circle completed a genesis mint of 10 billion ARC tokens, describing it as a technical milestone rather than a commitment to a public launch

Why Does Paying Gas in USDC Matter?

The practical effect is that a treasurer can fund an operational wallet with a single asset and be done. There is no separate position in a floating-price token to size, hedge, mark or explain to an auditor, and no failed transaction because the gas balance drained while the stablecoin balance sat full. Fee volatility decouples from token speculation.

Circle pairs that with sub-second deterministic finality, which is the other half of the institutional pitch. Probabilistic finality — waiting N blocks and hoping — is workable for retail transfers and genuinely awkward for delivery-versus-payment settlement, where two legs have to be irrevocably done at the same instant. We walked through why that distinction drives so much infrastructure design in our explainer on atomic settlement and DvP for tokenized assets.

Who Is Running the Network?

The validator set is the part that will get the most attention, and it is unusual: BlackRock, DTCC, ICE, Mastercard, Visa and SBI Group are among eleven founding validators, onboarding in phases. DTCC and ICE in particular are post-trade and exchange infrastructure rather than crypto-native firms.

The day-one application list spans both worlds. Circle names global banks including BNY, HSBC and Standard Chartered, exchanges including Coinbase, Kraken and Binance, and protocols including Aave, Uniswap and Morpho — with more than 100 institutional and ecosystem builders participating overall. On the developer side, Circle reports over 1,200 projects built during the testnet phase, which processed 700 million transactions in under a year.

A fair caveat: a validator set drawn from large regulated institutions is a different decentralisation profile from a permissionless chain, and Circle is explicit that the network starts under proof of authority with a proof-of-stake transition explored for 2027. Read that as a design choice aimed at a specific customer, not as a claim about censorship resistance.

What About the ARC Token?

Circle completed the genesis mint of 10 billion ARC tokens this week and was careful about how it framed the move. Per The Block's reporting, the company described it as a technical milestone rather than a commitment to launching the tokens publicly. ARC is positioned as the network's coordination mechanism for security, utility and governance; USDC remains the fee currency regardless. Whether ARC ever trades publicly is, as of today, undecided.

The Rest of the Feature Set

Beyond gas and finality, Circle lists opt-in privacy through confidential transactions and balances, native support for stablecoins and tokenized real-world assets, explicit design for AI agents as economic participants, and post-quantum signature support. Two of those carry an asterisk worth stating plainly: the privacy features have not yet shipped network-wide and remain in development.

EVM compatibility means existing Solidity contracts and tooling run immediately, which is how a chain gets 100 applications on day one rather than in month six.

This lands days after Circle's acquisition of Tazapay to extend its payment rails, and together the two moves sketch a company building the settlement layer and the on-ramps at the same time. More market-infrastructure coverage sits on our crypto page.

Sources: Circle Pressroom — September 16, 2026; The Block — September 16, 2026.