Circle Launches Arc Mainnet With BlackRock, Visa and Institutional Validators

Arc Uses USDC for Gas and Targets Sub-Second Finality

Arc is EVM-compatible, allowing developers to use Solidity smart contracts and Ethereum development tooling. Unlike networks that require users to hold a separate volatile native token for gas, Arc denominates transaction fees in USDC using 18-decimal precision.

The network combines an EIP-1559-style fee mechanism with exponentially weighted moving-average smoothing intended to reduce abrupt fee changes during traffic spikes. Its performance and fee specifications at launch included several distinct benchmarks.

Circle says Arc provides deterministic finality without reorganization risk. Consensus initially uses proof-of-authority and runs Tendermint BFT through Circle’s Malachite implementation, meaning a fixed group of known institutions rather than an open validator market produces and validates blocks.

Circle named Arc’s founding validator cohort on August 5, 2026. The group includes BlackRock, the Depository Trust & Clearing Corporation, Galaxy, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation, Visa and Worldpay, alongside Circle. The institutions are expected to join the validator set in phases.

Arc documentation separately characterizes the validator network as approximately 20 SOC 2-certified operators distributed across multiple regions. Circle’s initial announcement identified 11 outside institutions in addition to Circle.

Developers do not need permission to deploy applications even though consensus remains permissioned. Arc’s deployment documentation says developers “can deploy contracts and send transactions without approval,” while “a fixed group of known, vetted institutions produce and validate blocks.”

Michael Blaugrund, ICE VP of Strategic Initiatives, said institutional customers had pointed to transaction costs and settlement characteristics as obstacles to blockchain adoption. “Arc's native capabilities, including predictable fees and instant finality, address real friction points these customers raised,” Blaugrund said.

Circle and DTCC also plan to enable tokenization of assets held in DTC custody on Arc beginning in the second half of 2027.

Aave, Morpho and Uniswap Join Arc at Mainnet

Arc launched with major decentralized-finance applications, including Aave and Morpho. Aave is deploying a V4 lending market on the network, supported by Bitwise, Cumberland, Dialectic, Galaxy, Gauntlet, Keyrock and Steakhouse Financial through activities including risk oversight, curated vault strategies and USDC and EURC liquidity.

Stani Kulechov, founder and chief executive of Aave Labs, said: “We're doubling down on the Circle ecosystem with a new Aave V4 market on Arc, bringing DeFi's most trusted credit infrastructure to a network purpose-built to bring real-world finance onchain.”

Morpho is also part of Arc’s lending infrastructure. Merlin Egalite, co-founder of Morpho, said: “Arc brings together the speed, stablecoin-native infrastructure, and institutional participation needed to expand onchain credit to a much broader market.”

Arc’s trading ecosystem includes Uniswap, Aero and fomo. Aero is the decentralized exchange created by Dromos Labs through the merger of Aerodrome and Velodrome in November 2025. Circle’s earlier August 5 integration list had referred to Aerodrome before the branding changed.

Other trading and market infrastructure named for Arc includes 1inch, Bankr, Dinari, Doppler, edgeX, Extended, Hibachi, LI.FI, o1.exchange, pools.trade, Pump.fun and Robinhood. Pools, the Uniswap Labs launchpad, announced before the mainnet rollout that it would serve as a day-one Arc launchpad.

Exchanges providing Arc access include Binance, Bitso, Bitvavo, Bybit, Gate, Kraken, KuCoin, MEXC, OKX, OSL, Upbit and Wenia. Institutional custody providers include Anchorage, BitGo, Ceffu, Copper, Fireblocks and Zodia Custody.

Banks participating in the broader ecosystem include BNY, BTG Pactual, HSBC, Lead Bank, Societe Generale, Standard Chartered and State Street.

StableFX, Tokenized Funds and Institutional Payments Expand Arc’s Scope

Circle integrated its Circle Payments Network directly with Arc and also connected StableFX, its infrastructure for continuous cross-currency trading and settlement.

StableFX supports round-the-clock currency trading using stablecoins. USDC, EURC, GBPA, JPYC and KRW1 are among the assets identified for the service, while the broader rollout has 22 stablecoins either active or onboarding.

The broader roster includes Brazil’s BRLA, Japan’s JPYC and Mexico’s MXNB, along with wrapped versions of the Argentine peso, Chilean peso, Colombian peso and Peruvian sol.

Tokenized real-world assets available through the Arc ecosystem include Circle’s USYC money market fund and BlackRock’s BUIDL tokenized Treasury fund, issued through Securitize. The funds can be used for trading, lending and collateral.

Additional assets being brought to Arc include private credit funds and cirBTC, Circle’s wrapped bitcoin. Tokenized-asset providers and managers participating in the network include Bitwise, Dinari, Janus Henderson, New York Life Investment Management with Centrifuge, Maple, Matrixdock, ProShares and xStocks by Payward.

Circle Mints 10 Billion ARC Tokens

Circle completed the genesis mint of ARC in the United States during the week of the mainnet launch, creating a fixed initial supply intended to support network security, utility and governance.

Circle characterized the mint as a technical milestone rather than confirmation of a broader public token rollout. The company says it is the first publicly traded company to mint a network token for a new Layer 1 blockchain. USDC remains the asset used to pay Arc transaction fees.

Circle is evaluating a transition from proof-of-authority to proof-of-stake in 2027, a change that would give ARC a direct role in network coordination and security.

Allaire first publicly said Circle was studying a network token during the company’s fourth-quarter earnings call in February 2026. Circle subsequently published an ARC whitepaper in May 2026.

The whitepaper divides the token supply among three categories and provides an initial inflation framework.

The inflation schedule is designed to decay over time. The planned governance system would allow ARC holders to vote on network fees, inflation and token-burn logic, while Circle retains control over protocol development, compliance and validator membership.

Circle had already sold ARC before completing the genesis mint. The company raised $222 million through a token presale at a $3 billion fully diluted valuation.

a16z crypto invested $75 million. Other buyers named in the presale include BlackRock, Apollo Funds, ICE, ARK Invest, SBI Group, Janus Henderson Investors, Standard Chartered Ventures, General Catalyst, IDG Capital, Haun Ventures, Bullish and Marshall Wace.

Circle has not disclosed the percentage of the supply sold in the presale or its token vesting terms.

Arc Adds AI Agent Wallets and Nanopayments

Circle launched Arc Studio and Arc App Kits alongside the mainnet. Arc Studio is an AI coding agent designed to generate smart contracts, application logic and deployment-ready code. Arc App Kits is an SDK covering payments, swaps, fiat or crypto onramps and yield functionality, with yield routed through Morpho.

Circle is also designing AgentVM, an environment intended to let AI agents process sensitive data while Arc records a verifiable record of the resulting output. AgentVM was still in design at mainnet launch.

Circle said USDC accounts for 98.8% of agent-driven transaction volume and said most agent-to-agent payments using the x402 standard have settled in USDC since Circle Agent Stack launched in May 2026. Circle did not publish the methodology behind the agent-volume figure.

Circle Agent Stack includes policy-controlled Agent Wallets, Nanopayments through Circle Gateway and an emerging Agent Marketplace. Arc Portal allows users to fund agent wallets and impose spending limits.

Nanopayments are deployed across 11 blockchains and can transfer USDC in amounts as small as $0.000001.

Circle’s longer-term roadmap includes a separate payments environment targeting more than 100,000 transactions per second, alongside broader post-quantum security protections. Arc already supports post-quantum signatures at launch.

Circle is separately developing opt-in confidential transactions and confidential balances using view keys for authorized parties. The system is intended to let selected entities inspect transactions or balances while keeping them confidential from general public visibility. The feature is not yet live across the full Arc network.

Permissioned Validators Draw Criticism

Arc’s permissioned consensus structure has drawn criticism from some crypto industry participants even though developers can deploy applications without approval.

Adam Cochran, a partner at Cinneamhain Ventures, criticized Arc’s design during an August 12, 2026 debate over permissioned and open blockchain architecture.

“this isn't an L1 and it's offensive to call it such,” Cochran said, arguing that “there are never economic incentives to be a faithful validator, and that's why they have to make it a private consortium.”

Mitchell DiRaimondo, founder of Steelwave Digital, framed the structure differently. It “isn't DeFi, and that's the point,” DiRaimondo said. “Bold? Yes. Terrible? Only if you confuse it with DeFi infrastructure.”

Arc’s model separates application access from block production: developers can deploy contracts and users can submit transactions without approval, while a vetted institutional group initially controls consensus.