Circle has launched Arc on public mainnet, moving its institution-focused Layer 1 blockchain from private deployment into public production. The network went live on September 16 with more than 100 applications and more than 100 institutional and ecosystem builders, while USDC serves as the network’s fee currency and major financial institutions participate in Arc’s founding validator cohort.
The launch marks a material change in Arc’s development lifecycle. Circle had previously operated Arc as a private mainnet and had announced September 16 as the planned public launch date. The network is now live, with exchange integrations and infrastructure support beginning to provide users and institutions with operational access.
Key Findings
- Circle launched Arc on public mainnet on September 16, 2026, moving the Layer 1 network from private mainnet into public production.
- Circle says Arc launched with more than 100 applications and more than 100 institutional and ecosystem builders spanning banks, asset managers, payment networks, exchanges, custodians, DeFi protocols, wallets and AI platforms.
- Arc uses USDC for network fees and is designed around financial-market infrastructure, real-time money movement and programmable onchain activity.
- Arc’s founding validator cohort includes BlackRock, DTCC, Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa alongside Circle.
- Kraken enabled USDC deposits and withdrawals on Arc on launch day, while Binance opened USDC deposits after completing its Arc integration.
What Happened?
Circle announced on September 16 that Arc had launched on public mainnet, completing the network’s transition from its earlier private-mainnet phase into a publicly accessible production network.
Arc is an open Layer 1 blockchain built around financial markets, real-time money movement and programmable economic activity. Circle says more than 100 applications and more than 100 institutional and ecosystem builders are involved with the network at launch.
Those participants span multiple parts of the financial and crypto infrastructure stack, including banks, asset managers, payment networks, exchanges, custodians, DeFi protocols and wallet providers. The scale of the launch ecosystem does not by itself prove sustained adoption or transaction demand, but it establishes that Arc has progressed beyond a test environment or future launch announcement.
How Arc Is Designed
Arc is designed as an EVM-compatible Layer 1 focused on financial applications. Unlike networks where transaction fees are primarily paid using a volatile native crypto asset, Arc uses stablecoins for fees, beginning with USDC.
That structure means network fees can be denominated in dollars, an architecture intended to make transaction costs more predictable for payment, settlement, treasury and other financial workflows.
Circle has positioned Arc as infrastructure for activities including payments, settlement, collateral, treasury operations and asset issuance. The network also integrates with Circle’s broader infrastructure, including USDC and its cross-chain and payment products.
Who Secures the Network?
Arc’s initial architecture uses a permissioned validator set rather than an open proof-of-stake validator model. Circle announced the founding validator cohort before the public mainnet launch.
The cohort includes Circle alongside BlackRock, The Depository Trust & Clearing Corporation, Galaxy, Global Payments, Intercontinental Exchange, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa.
The institutional composition of the validator group is significant because Arc is being designed specifically around financial infrastructure. It also means the network’s initial trust and governance model differs from permissionless proof-of-stake networks where participation in validation is broadly open.
USDC Plays a Central Role
USDC is integrated directly into Arc’s operating model. Network fees are payable in USDC, allowing applications and users to transact without requiring a separate volatile asset solely to pay gas fees.
Circle’s broader infrastructure also connects Arc with other blockchain ecosystems. This is intended to support movement of stablecoin liquidity and financial activity between Arc and networks already used by crypto applications and institutions.
Circle’s current USDC documentation lists Arc among the networks with native USDC support, establishing the stablecoin as part of Arc’s live production infrastructure rather than a future integration.
Exchange Access Is Already Going Live
The public mainnet launch was accompanied by operational exchange integrations.
Kraken announced on September 16 that USDC deposits and withdrawals through Arc were live, giving its users direct funding access to USDC on the network.
Binance also completed its USDC integration on Arc and opened deposits on September 16. Binance said withdrawals would be enabled once sufficient deposits were available.
These integrations are useful evidence that Arc’s public launch includes operational infrastructure beyond Circle’s own announcement. They should not, however, be interpreted as proof of large-scale user adoption. Exchange support establishes access; actual usage and sustained economic activity must be measured separately.
From Private Mainnet to Public Production
The distinction between Arc’s earlier milestones and the September 16 event is important. Circle launched an Arc public testnet in October 2025 and later operated a private mainnet with institutional and ecosystem participants.
In August 2026, Circle announced its founding validator cohort and said Arc was scheduled to reach public mainnet on September 16. That announcement established the intended launch date but did not mean the public production network was already operational.
The September 16 launch completes that stage of the roadmap. Arc can therefore now accurately be described as a public mainnet rather than a planned, testnet or private-mainnet deployment.
What Comes Next for Arc?
Public mainnet is not the end of Arc’s technical roadmap. Circle says future development is centered on proof of stake, privacy and scalability.
Circle also disclosed that it completed the genesis mint of an ARC token, creating an initial supply of 10 billion tokens. The company explicitly said the mint is not a commitment to publicly launch the token. ARC is being explored as part of a potential transition from Arc’s current proof-of-authority model toward proof of stake in 2027.
That distinction is important: the ARC token has been technically minted, but Circle has not announced a public token launch. The network’s current transaction fees remain payable in USDC.
Why It Matters
Arc enters a crowded Layer 1 market, but its design and launch strategy differ from many general-purpose blockchain networks. Circle is positioning it around institutional financial infrastructure, stablecoin settlement and predictable dollar-denominated transaction costs rather than primarily around a new native token economy.
The involvement of major financial institutions in validation and infrastructure gives the launch institutional significance, while live USDC access through exchanges provides an initial operational bridge between Arc and existing crypto markets.
The next question is adoption. More than 100 builders and applications at launch demonstrate ecosystem participation, but production deployment should not be confused with sustained economic use. Transaction activity, settlement volume, active applications and real institutional workflows will provide stronger evidence of Arc’s long-term role.
The Bottom Line
Arc is now a live public Layer 1 network rather than a future Circle project. Its September 16 launch brings together native USDC infrastructure, more than 100 applications, more than 100 institutional and ecosystem builders, a validator cohort containing major financial institutions and initial exchange access through platforms including Kraken and Binance.
The launch establishes production infrastructure, not proof of mass adoption. Arc’s next test will be whether its institutional participants, applications and stablecoin-focused architecture translate into sustained onchain financial activity at meaningful scale.
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