Circle officially launched the Arc public mainnet on September 16, 2026, marking a significant expansion from stablecoin issuance and payment infrastructure into operating a Layer 1 blockchain designeCircle officially launched the Arc public mainnet on September 16, 2026, marking a significant expansion from stablecoin issuance and payment infrastructure into operating a Layer 1 blockchain designe

Circle Launches Arc Mainnet: From USDC to Building Onchain Financial Infrastructure

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Penulis: Nguyen Rin Hoang

2026/09/21 22:24

Circle officially launched the Arc public mainnet on September 16, 2026, marking a significant expansion from stablecoin issuance and payment infrastructure into operating a Layer 1 blockchain designed for financial markets. Circle positions Arc as an “Economic Operating System for the Internet,” focused on real-time payments, tokenized assets, trading, lending, and economic activity involving AI agents.

Arc launched with more than $74 billion in USDC in circulation. The network uses USDC as the asset for paying transaction fees, provides deterministic finality in under one second, and is designed to meet the compliance, operational, and settlement requirements of financial institutions.

The scale of the ecosystem from day one is also notable. Circle said Arc launched with more than 100 applications and more than 100 institutional and ecosystem builders, while its founding validator cohort includes BlackRock, DTCC, Mastercard, Visa, ICE, and several other major financial institutions.

CEO Jeremy Allaire described Arc as the most important launch in Circle’s history since USDC, not as something more important than USDC itself. This reflects Circle’s broader ambition: not only to issue a digital dollar, but also to build an infrastructure layer where stablecoins, financial assets, and applications can operate directly.

Key Takeaways

Circle officially launched the Arc public mainnet on September 16, 2026, a Layer 1 blockchain focused on financial markets, real-time payments, and agentic economic activity.

Arc uses USDC to pay network fees, instead of requiring users to hold ARC or another volatile native token for gas.

The network supports deterministic sub-second finality, targeting use cases that require fast settlement such as payments, FX, and trading.

More than 100 institutional and ecosystem builders participated from the time of the mainnet launch, alongside more than 100 applications.

BlackRock, DTCC, Mastercard, Visa, ICE, Standard Chartered, and several other organizations are part of the founding validator cohort, with validator deployment taking place in phases.

Circle completed a genesis mint of 10 billion ARC, but emphasized that this does not mean ARC has been publicly launched.

Arc currently uses Proof of Authority with a permissioned validator set, while Circle is exploring a potential transition to Proof of Stake in 2027.

Privacy is part of Arc’s roadmap, but confidential transaction features should not yet be understood as fully deployed across the entire network.

What Happened? How Did Circle Launch the Arc Blockchain?

Arc is a public Layer 1 blockchain developed by Circle specifically for financial applications. Unlike general-purpose blockchains that must support many different types of applications, Arc is optimized from the beginning for stablecoin payments, FX, tokenized assets, lending, trading, and institutional settlement.

The first notable design choice is that USDC serves as the gas asset.

Users and businesses making transactions on Arc can pay network fees using USDC. This removes the need to purchase a separate volatile token solely to pay transaction fees, while also helping businesses estimate costs more easily in U.S. dollar terms.

ARC has a different potential role. Circle has designed the token as a possible coordination asset for security, governance, and utility if the network transitions to Proof of Stake in the future. Under the current plan, network fees will continue to be paid in USDC.

Arc Targets Sub-Second Settlement

Circle says Arc provides deterministic sub-second finality.

For a blockchain designed for financial markets, raw block speed is not the only important factor. Finality matters because it determines when a transaction can be considered complete and irreversible for settlement purposes.

For payments, FX, or trading, knowing that a transaction has been finalized within a very short period may be more important than simply achieving high theoretical transaction throughput.

Privacy Is Designed for Institutional Needs, but Is Still Under Development

Circle also wants Arc to provide opt-in privacy for businesses and financial institutions.

The current roadmap includes a Privacy Sector for confidential transactions. The goal is to allow institutions to protect sensitive information while still maintaining the ability to meet audit and compliance requirements.

However, this distinction is important: privacy is part of Arc’s roadmap and should not be described as though the entire confidential transaction infrastructure was fully completed on mainnet from day one.

More Than 100 Organizations Are Participating in Arc, but They Have Different Roles

Circle said Arc had more than 100 institutional and ecosystem builders at the time of the public mainnet launch. The list spans banks, asset managers, payment networks, exchanges, custodians, DeFi protocols, wallets, and infrastructure providers.

However, not all of them are validators.

The founding validator cohort includes Circle along with BlackRock, DTCC, Galaxy, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation, Visa, and Worldpay, now part of Global Payments. Circle said onboarding this validator group is taking place in phases.

Other organizations participate in different roles:

HSBC is among the banks participating in or building on Arc.

BlackRock is also among the asset managers and RWA issuers.

Mastercard and Visa are involved in payment infrastructure.

Uniswap is part of the onchain trading and liquidity category.

Aave and Morpho support lending and credit markets.

Anchorage, BitGo, Fireblocks, and Zodia Custody are part of the custody infrastructure layer.

This distinction matters because a company appearing in the Arc ecosystem does not necessarily mean that it is directly operating a validator or has already moved a significant portion of its business activity onto Arc.

Background / Context: Circle Is Expanding From a Stablecoin Issuer Into a Blockchain Infrastructure Provider

Circle is best known for USDC. At the time Arc launched, the company said more than $74 billion in USDC was in circulation.

USDC previously relied primarily on infrastructure provided by external blockchains. As of September 16, 2026, Circle said USDC was supported natively on 38 blockchain networks, including Ethereum, Solana, Base, Arbitrum, Avalanche, and now Arc.

Arc changes part of that structure.

Instead of Circle only issuing USDC on blockchains developed by other organizations, the company now operates a Layer 1 designed directly around its own products and infrastructure.

This does not mean Circle is withdrawing USDC from Ethereum, Solana, or other ecosystems. Circle has clearly stated that Arc is intended to complement third-party blockchains where USDC is already widely used.

Strategically, Arc can therefore be viewed as a new infrastructure layer alongside Circle’s existing multichain operations, rather than as a complete replacement for them.

The ARC Token Exists, but It Has Not Had a Public Token Launch

Another detail that should be separated from the mainnet launch is the ARC token.

During the mainnet launch week, Circle completed the genesis mint of the entire 10 billion ARC initial supply in the United States. The company describes ARC as a digital commodity designed to potentially support Arc’s security, utility, and governance in the future.

However, Circle also clearly emphasized that the genesis mint:

is not a commitment to publicly launch ARC.

Therefore, the fact that 10 billion ARC has been minted does not mean 10 billion tokens are circulating publicly or freely tradable in the market.

Before mainnet, Circle also entered into token purchase agreements with institutional investors. The company’s Q2 filing said that the total amount of ARC covered by these agreements reached 807.5 million tokens by the end of June 2026. These tokens are subject to transfer restrictions and lock-up conditions related to the transition toward Proof of Stake.

Why It Matters: Why Is Arc Important to Circle’s Strategy?

Circle Is No Longer Only Building Products on Other Blockchains

The biggest strategic implication of Arc is that Circle is shifting its position within the blockchain stack.

Previously, Circle’s core value centered on USDC and services related to issuing, minting, redeeming, transferring, and using the stablecoin across multiple networks.

With Arc, Circle also becomes the developer of the underlying infrastructure where those activities can take place.

This could create a more tightly integrated ecosystem across:

USDC and other stablecoins.

Payments.

FX.

Tokenized assets.

Lending.

Onchain trading.

Institutional custody.

AI-based economic activity.

Circle describes this approach as a full-stack platform for the internet financial system.

If Arc achieves meaningful adoption, Circle would no longer depend solely on how much USDC is used on third-party infrastructure. The company could also become a direct blockchain infrastructure provider for financial activity that uses USDC.

This is an analysis of Arc’s strategic direction; its actual effectiveness will still depend on how much the network is used after mainnet.

USDC Becomes Part of the Network Economics

The decision to use USDC as gas is one of Arc’s most notable differences.

On many blockchains, users must hold the network’s native token to pay transaction fees. This creates an additional step for businesses that only want to use stablecoins for payments or settlement.

Arc removes that step by using USDC directly.

For businesses, this could help:

Make network costs easier to price in U.S. dollars.

Avoid holding a volatile token solely to pay gas.

Simplify the user experience for stablecoin payments and settlement.

Give USDC additional utility at the blockchain infrastructure level.

If Arc grows, this could create additional demand for USDC usage. However, the actual impact will depend on transaction volume and how many applications genuinely move activity onto Arc.

Institutional Validators Are an Intentional Design Choice

Arc does not currently use permissionless Proof of Stake like Ethereum.

The network begins with Proof of Authority and a permissioned validator set, with institutions such as BlackRock, DTCC, ICE, Mastercard, and Visa included among the founding validators.

This approach sacrifices some degree of permissionless participation in favor of factors Circle considers important for financial infrastructure, including a clear governance perimeter, operational reliability, and compliance.

This also differentiates Arc from many existing public chains.

Arc remains a public mainnet that users and developers can interact with, but participation in consensus is not yet completely open to everyone.

The long-term question is therefore whether Circle can expand validator participation through PoS while still maintaining the standards institutional clients require.

Impact: How Could Arc Affect the Market?

Impact on Circle

For Circle, Arc opens another growth path beyond the traditional stablecoin issuer model.

If adoption increases, Arc could strengthen the ecosystem around Circle’s existing products, particularly USDC, EURC, Circle Wallet infrastructure, Gateway, and developer tools.

Arc Studio and Arc App Kits were also launched alongside mainnet to help developers build applications and integrate payments, swaps, on-ramps, or yield functionality more easily.

The potential value lies in network effects.

More developers could create more applications. More applications could drive transaction activity and stablecoin usage. But this process still needs to be proven through actual mainnet data and cannot be inferred solely from the list of launch partners.

Impact on USDC

USDC could be the asset that benefits most directly in terms of utility if Arc succeeds.

The stablecoin is natively integrated into the network and is used to pay fees. Circle is also connecting Arc to an ecosystem where USDC already has broad distribution across many blockchains and financial institutions.

However, Arc does not mean that all USDC activity will move to the new blockchain.

Circle continues to support USDC across dozens of other networks. This shows that the current strategy remains multichain distribution, with Arc serving as an environment optimized specifically for financial use cases.

If Arc succeeds, a more reasonable impact would be expanding USDC’s total utility rather than simply shifting activity away from Ethereum or Solana and onto Arc.

Impact on Tokenized Assets

Circle identifies tokenized assets as one of Arc’s main use cases.

BlackRock and several other asset managers or RWA issuers were part of the ecosystem when mainnet went live. In its Q2 report, Circle also said BlackRock was expected to deploy BUIDL, the BlackRock USD Institutional Digital Liquidity Fund, on Arc, while DTCC was expected to support tokenization of assets held in DTC custody on the network.

If these integrations are implemented at meaningful scale, Arc could become an important settlement layer for RWA.

However, it is important to distinguish between an integration announcement and economic adoption.

Metrics such as tokenized asset value, transaction volume, active wallets, and institutional settlement activity will show whether Arc truly becomes infrastructure for RWA or simply has a large list of early partners.

Impact on Ethereum, Solana, and Other Layer 1 Networks

Arc is both complementary and competitive with existing blockchains.

From a USDC distribution perspective, Circle continues to support Ethereum, Solana, Base, and many other networks. The company also says Arc is designed to complement third-party ecosystems rather than replace them.

However, at the blockchain infrastructure level, Arc still competes for:

Developers.

Applications.

Stablecoin liquidity.

Tokenized assets.

Institutional settlement.

Trading activity.

Onchain lending.

If a bank or asset manager chooses Arc as its primary settlement environment instead of Ethereum or a Layer 2, that still represents competition for economic activity.

Therefore, the question is not simply whether Arc will “replace Ethereum.” A more useful question is how much financial activity Arc can capture in an increasingly multichain market.

Impact on the ARC Token

ARC has a different role from USDC.

USDC is used for network fees, while ARC is designed as a coordination asset if Arc transitions to Proof of Stake. Circle says ARC could support staking, governance, and other utility functions.

However, there are three important points to keep in mind.

First, 10 billion ARC has been genesis minted, but a public launch has not been confirmed.

Second, Arc currently still uses Proof of Authority.

Third, Circle’s SEC filings state that the timing and structure of the transition to PoS, as well as broader ARC distribution, remain dependent on technical, business, legal, and market factors.

Therefore, there is not enough basis to infer ARC’s price impact or valuation solely from the mainnet launch.

What Happens Next?

The public mainnet is only the beginning. The key question now is whether Arc can convert the significant institutional interest present at launch into real onchain activity.

Several factors are worth monitoring:

Transaction volume: Arc needs to prove that the network is being used for payments, trading, and settlement rather than simply generating integration announcements.

USDC activity: The amount of USDC bridged, minted, or used natively on Arc will show whether the network is actually expanding stablecoin utility.

Tokenized assets: The deployment of BUIDL and other RWA products will be an important measure of institutional adoption.

Validator rollout: It will be important to track how many founding validators actually become operational as the phased deployment process is completed.

Privacy: Circle still needs to move confidential transaction capabilities from the roadmap into production.

Scalability: Circle targets more than 100,000 transactions per second for the Payment Sector, but this is a roadmap objective rather than the current performance of the entire network.

Proof of Stake: Circle is exploring a transition from PoA to PoS in 2027, but the timeline and final structure are not guaranteed.

ARC distribution: Public availability, tokenomics, staking structure, and governance will become important issues if Circle decides to distribute ARC more broadly.

Developer adoption: The number of applications with actual users and volume will matter more than the number of projects announcing integrations.

For Circle, the most important measure in the next phase will not be how many major names appear in Arc’s press releases, but whether the network generates payments, settlement, tokenization, and lending activity at meaningful scale.

FAQ

What Is Circle Arc?

Arc is a Layer 1 blockchain developed by Circle for financial markets, real-time money movement, and agentic economic activity. The network is designed for use cases including stablecoin payments, FX, tokenized assets, trading, and lending.

Which Token Does Arc Use to Pay Transaction Fees?

Network fees on Arc are paid in USDC. ARC is not the gas token under the current design; instead, it is intended to serve as a coordination asset for security, governance, and utility if the network transitions to Proof of Stake.

Has Circle Issued 10 Billion ARC?

Circle has completed the genesis mint of 10 billion ARC, representing the full initial supply. However, the company has made clear that the genesis mint is not a commitment to publicly launch ARC, so it should not be interpreted as meaning that the entire supply has entered the market.

Does Arc Currently Use Proof of Stake or Proof of Authority?

Arc currently uses Proof of Authority with a permissioned validator set. Circle is exploring a potential transition to Proof of Stake in 2027, but the timing and final structure remain dependent on technical, business, and legal factors.

Are BlackRock and Visa Validators on Arc?

Yes. BlackRock and Visa are part of the founding validator cohort alongside organizations such as DTCC, ICE, Mastercard, Standard Chartered, and SBI Group. Circle said the deployment of these validators is taking place in phases.

Will Arc Replace Ethereum and Solana for USDC?

There is currently no basis for concluding that. Circle continues to support USDC across multiple blockchains and says Arc is designed to complement existing third-party ecosystems. Arc may compete for applications and institutional financial activity, but Circle’s USDC distribution strategy remains multichain.

Disclaimer: The information provided here is for informational purposes only and should not be considered financial, investment, legal, or professional advice. Always conduct your own research, consider your financial situation, and, if necessary, consult with a licensed professional before making any decisions.

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