Circle has launched the public mainnet of Arc, a layer-1 blockchain built around its own stablecoin. The network went live Tuesday with USDC as the native gas token, meaning every transaction fee on Arc is paid in the dollar-pegged USDC that Circle itself issues. More than 100 applications and institutional builders came online at launch, including banks, asset managers and payment networks.
The founding validator cohort reads like a list of the firms that already run global finance: BlackRock, the Depository Trust and Clearing Corporation, Mastercard, Visa, Galaxy and Standard Chartered, alongside banks including BNY, HSBC, Societe Generale and State Street. Circle CEO Jeremy Allaire called Arc ‘the single most significant launch in Circle’s history since USDC itself.’
What Arc actually is
Arc is an Ethereum Virtual Machine compatible layer-1 blockchain aimed at financial markets, real-time money movement and what Circle calls agentic economic activity. It uses a consensus design called Malachite BFT that delivers sub-second finality, and it connects to more than 20 other blockchains through Circle’s Cross-Chain Transfer Protocol and Gateway. The network supports more than 20 fiat-backed stablecoins beyond USDC, including EURC, JPYC and TRYB, and tokenized assets like BlackRock’s BUIDL fund and Circle’s USYC are available natively at launch.
The design choices are aimed squarely at regulated finance. Validators are permissioned, governance is defined, and the network’s fee token is a regulated stablecoin rather than a volatile crypto asset. Circle says that structure is meant to let banks operate on public blockchain rails while meeting their own supervisory expectations. Developers do not need permission to deploy on Arc, but the validator set is institutionally curated, at least for now. Cross-chain bridges including Across, Axelar, Stargate and Wormhole added support at launch, and exchanges including Gate listed the network the same day.
The agentic angle deserves attention. Circle has been pushing USDC as the default settlement currency for AI agent payments, where software buys and pays for services without a human in the loop. Arc was described by the company as built for programmable money, global markets and agentic economic activity, which puts it in direct competition for the machine-to-machine payments market that Stripe’s Tempo chain and Ripple’s updated XRP Ledger developer kit are also targeting.
The ARC token question
Circle minted 10 billion ARC tokens in the genesis block this week, and the mint drew immediate attention. The company says the tokens are not a public issuance, not listed anywhere and not part of an airdrop. They are designated to serve as governance and security assets when Arc transitions from its current proof of authority model to proof of stake, a move planned for 2027. Until then, fees stay in USDC and the ARC token has no market role. Circle has publicly warned that any ‘ARC’ token trading on exchanges right now is not an official mainnet asset.
That caveat has not stopped speculation. A reported presale for a future ARC allocation was said to have been backed by Andreessen Horowitz at a valuation near $3 billion, and scam tokens using the name have already appeared on decentralized exchanges. The gap between the genesis mint and an actual token launch is where most of the risk sits for retail buyers right now. Circle’s own history supports some skepticism about timelines, since Arc’s public testnet first appeared in October 2025, nearly a year before the mainnet went live.
Why it matters for USDC’s position
Arc arrives as competition among stablecoin issuers shifts from wallets to infrastructure. Tether’s CEO has publicly ruled out building a proprietary chain for USDT, keeping Tether’s flagship token distributed across Tron, Ethereum and third-party networks, though Tether has invested in separate stablecoin chains like Plasma and Stable. Stripe is building its own payments chain called Tempo, which already processes stablecoin payments for DoorDash couriers. PayPal, Ripple and others are pursuing similar strategies through partnerships rather than new networks.
By owning the rails, Circle captures fee revenue and controls settlement quality end to end, something it could not do when USDC lived entirely on Ethereum and other chains it does not govern. The launch also follows a period of expansion for USDC, which now circulates more than $74 billion and has become the default settlement token for much of institutional crypto, including being the dominant currency for AI agent payment experiments. BlackRock already manages roughly 88% of Circle’s USDC reserves through the Circle Reserve Fund, so its validator seat deepens an existing relationship rather than starting a new one.
The timing is notable. The Senate’s failed vote on the Digital Asset Market Clarity Act this week pushed the SEC and CFTC to act on their own authority, and Circle’s move landed the same week as the SEC’s tokenization exemption for stock trading venues. Stablecoin-native infrastructure like Arc fits directly into that regulatory opening, since the tokens it moves are already regulated under the GENIUS Act framework that took effect last year.
What comes next depends on whether real volume shows up. Circle says institutions including BlackRock, Goldman Sachs, Mastercard and Visa participated in Arc’s testnet since October 2025, but test participation does not equal production volume. The network starts with a small validator set and a governance token that has no public market. Circle has said it plans to broaden participation in network operations and explore the proof of stake transition in 2027, and that is when ARC becomes tradable and the network’s economics change. Until then, Arc is a bet by the largest US-regulated stablecoin issuer that it can be both the money and the network it runs on.