Circle is scheduled to open Arc, its purpose-built Layer 1 blockchain for stablecoin settlement and tokenized financial assets, to the public on Sept. 16 with a closed validator group led by financial-market infrastructure and payments companies. The launch arrives one day after the U.S. Senate is set to hold a cloture vote on the CLARITY Act, legislation that could determine how much legal certainty Arc has for its longer-term ambition of bringing traditionally custodied assets on-chain.
Arc is designed around Circle’s role as USDC issuer rather than around the high-turnover trading activity that has driven many Ethereum-compatible networks. Its initial focus is stablecoin payments, foreign-exchange clearing and settlement of tokenized real-world assets, with USDC serving as the network’s native gas token. Users therefore would not need to acquire a separate volatile asset to pay transaction fees.
The network’s most consequential early constraint is its validator model. Arc will launch with 12 pre-approved validators: Circle, DTCC, Intercontinental Exchange, Visa, Mastercard, MoneyGram, Global Payments, BlackRock, Standard Chartered, SBI Group, Sumitomo Corporation and Galaxy. The arrangement gives the network recognizable institutional operators from day one, while placing control of transaction ordering and network availability within a limited group.
Under the Byzantine fault-tolerant consensus model used by Arc, four of the 12 validators could halt the network by refusing to participate, while eight could rewrite its ledger under the assumptions cited in Arc’s documentation. Circle has not published a route for outside operators to join the validator set before launch.
A settlement network built around USDC
Arc uses Malachite, a consensus engine developed by Informal Systems, alongside Reth, an Ethereum-compatible execution layer. The combination gives developers access to Solidity and familiar Ethereum development tools while offering deterministic finality: a transaction is final once more than two-thirds of validators have signed it.
Circle says Arc targets block times of roughly 0.5 seconds and has measured finalization at about 350 milliseconds. In institutional settlement workflows, that model would provide a clearer point of completion than chains where transactions become increasingly secure as additional blocks are added.
The network also includes an arc_getCertificate function that can identify the validators that signed a transaction’s confirmation. That certificate could be stored as evidence that a payment or asset transfer reached final settlement. A separate arc_getVersion function is intended to let users query the software version run by a node, a feature aimed at operational oversight rather than retail use.
Arc’s data-access design may be less familiar to users accustomed to querying older blockchain history at standard node costs. Ordinary nodes retain full state for only the previous 127 blocks, or around one minute according to the network’s target block timing. Requests for older history are directed to archive nodes, where data access is expected to cost more. On Ethereum, a comparable 127-block window is closer to 25 minutes.
Circle is also offering optional confidential transfers that hide the transferred amount while leaving wallet addresses visible. The feature relies on trusted execution environments, or TEEs, which protect computations through specialized hardware. The privacy model therefore depends partly on hardware vendors and their security assumptions rather than solely on cryptographic proofs.
U.S. stablecoin rules shape Arc’s architecture
The GENIUS Act, which took effect on July 18, 2025, established federal requirements for payment stablecoins that closely track several of Arc’s design choices. The law requires issuers to maintain high-liquidity reserves, publish monthly reserve disclosures and obtain quarterly third-party audits. Issuers with more than $10 billion in outstanding liabilities must operate under federal licensing as permitted payment stablecoin issuers.
It also requires compliance with Bank Secrecy Act anti-money-laundering and know-your-customer obligations. Arc includes a built-in blacklist capability aligned with those requirements, extending the compliance controls Circle already uses around USDC into the network layer.
The law prohibits stablecoin issuers from paying interest or yield to holders, drawing a legal line between payment stablecoins and bank deposits. Arc does not place an interest-bearing asset at its base layer, while its use of USDC for gas keeps the chain’s fee economy linked to a regulated dollar token. The Federal Deposit Insurance Corporation has said reserves backing stablecoins are not covered by federal deposit insurance.
Circle has described EIP-7708 as supporting an audit trail suited to its disclosure and audit obligations. The standard is intended to create more structured records around transactions, potentially making it easier for regulated firms to reconcile activity and retain documentation.
Senate vote could affect the 2027 DTCC plan
The Senate’s Sept. 15 cloture vote on the CLARITY Act does not alter Arc’s scheduled launch, but it could shape the legal environment for its planned DTCC integration in the second half of 2027. Circle has described that integration as a route to move DTC-custodied assets on-chain for atomic settlement against stablecoins.
Atomic settlement means the asset and payment would either complete together or fail together, reducing the risk that one side of a trade settles while the other does not. For that model to extend beyond controlled pilots, market participants would need clarity on the regulatory treatment of the underlying tokenized assets and the networks carrying them.
The CLARITY Act draft would allocate spot-market oversight of qualifying “digital commodities” to the Commodity Futures Trading Commission while retaining Securities and Exchange Commission authority over securities. It describes a four-step mature-chain test and includes a 20% ownership cap for a token to leave securities treatment through the bill’s proposed process.
A failed procedural vote could leave the SEC, CFTC, Office of the Comptroller of the Currency and Treasury to develop separate policies, with comprehensive market-structure legislation potentially delayed until 2029. That outcome would complicate the legal work behind moving DTC-custodied instruments into an on-chain settlement environment, even if Arc’s technology is ready.
ARC token remains separate from the mainnet launch
Arc’s mainnet opening is not a token generation event. ARC has not been issued, and Circle has not announced a date for its release. The disclosed plan calls for an initial supply of 10 billion ARC tokens, with 60% allocated to the ecosystem and 25% retained by Circle. The remaining 15% has not been detailed.
Circle completed a $222 million institutional ARC pre-sale in May 2026 at a $3 billion fully diluted valuation. a16z crypto contributed $75 million, while BlackRock, ICE, Apollo, ARK Invest and Standard Chartered Ventures also participated, according to the project’s disclosures.
ARC is intended to support a future move from proof-of-authority to proof-of-stake, governance over economic settings and a mechanism for converting stablecoin fees into ARC for validators and stakers. Critical details remain unpublished, including token inflation, emission decay, validator revenue splits, burn rates and the lockup schedules for pre-sale participants.
Those unknowns place early governance power alongside the entities holding the largest initial allocations. Until Circle publishes the economics and distribution timetable, the token’s market structure cannot be assessed from the pre-sale valuation alone.
DeFi access arrives alongside institutional ambitions
Arc will be compatible with Ethereum applications from launch, with Aave, Uniswap v4, Morpho and Aerodrome expected to provide lending, swaps and liquidity functions around USDC and other supported assets. Users would also be able to hold EURC and configure access to a tokenized money-market fund identified as USYC.
That openness creates a tension Arc will need to manage. Any developer can deploy ERC-20 tokens and liquidity pools through its EVM-compatible environment, even as the validator layer remains permissioned and Circle presents the chain as a regulated settlement venue. ARCLaunch, an unaffiliated project, has already said it plans token-creation, trading and referral tools for Arc users.
Circle’s approach differs from platforms that have issued price-linked instruments before securing traditional custody and market-infrastructure arrangements. Arc’s roadmap instead points to DTCC-backed movement of actual DTC-custodied assets, provided the legal framework develops as expected.
The Sept. 16 launch will show whether Circle can make a tightly governed validator network attractive to developers and financial institutions at the same time. Near-term disclosures on validator admission, ARC economics and the Senate’s market-structure vote will determine how much of Arc’s settlement roadmap can move from architecture into live financial activity.
Want deeper context on US stablecoin rules shaping Arc’s launch? Explore our explainer on the GENIUS Act next.
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