- Circle launched Arc’s public mainnet on September 16, creating a stablecoin-focused Layer 1 for payments, tokenized assets and institutional finance.
- BlackRock, DTCC, Mastercard and Visa are among 11 founding third-party validators, alongside Circle.
- USDC serves as Arc’s native transaction-fee currency, removing the need for users to hold a separate volatile gas token.
Circle has moved its Arc blockchain into public mainnet, giving the USDC issuer its own Layer 1 infrastructure for payments, capital markets and tokenized real-world assets. The September 16 launch brings some of the largest names in traditional finance directly into the network’s infrastructure, including BlackRock, DTCC, Mastercard and Visa. Arc is EVM-compatible and uses USDC for transaction fees, while Circle is positioning the network for institutional settlement, cross-border payments, foreign exchange and AI-driven economic activity. The launch arrives as U.S. lawmakers struggle to advance comprehensive crypto market-structure legislation.
Wall Street Institutions Secure Arc
Unlike many public Layer 1 networks that begin with an open validator system, Circle is launching Arc with a curated group of financial and payments companies.
The 11 founding third-party validators are BlackRock, DTCC, Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa. Circle is also participating in network validation.
Arc remains publicly accessible for users and developers, although validator participation is currently permissioned. Circle describes the architecture as a way of meeting the operational, compliance and security requirements expected by large financial institutions.
The network is compatible with the Ethereum Virtual Machine, allowing developers familiar with Ethereum tooling to deploy applications and smart contracts on Arc.
Another major difference is its fee structure. Instead of requiring users to acquire a separate native cryptocurrency for gas, Arc uses stablecoin-based transaction fees, with USDC at the center of the network’s settlement infrastructure. Circle also advertises deterministic sub-second finality and configurable privacy features aimed at institutional applications.
Arc Builds Around USDC and Tokenization
Arc’s public launch follows almost a year of testing. Circle launched the Arc public testnet in October 2025 with more than 100 companies participating in its development ecosystem.
According to Circle, the network processed more than 150 million transactions and close to 1.5 million transacting wallets during its first 90 days, with average settlement times around half a second.
The mainnet ecosystem extends into decentralized finance as well. Launch reporting identifies Aave, Morpho and Uniswap among protocols available from day one.
Circle’s broader developer stack also connects Arc with infrastructure for wallets, smart contracts, cross-chain USDC transfers and tokenized assets. Chainlink provides infrastructure spanning market data and cross-chain interoperability within Circle’s wider ecosystem.
Circle Targets Institutional Finance
Arc gives Circle infrastructure beyond simply issuing USDC. The company is targeting capital-market settlement, collateral management, tokenized real-world assets, cross-border payments and 24/7 foreign-exchange activity. Arc is also designed for machine-driven payments as Circle develops tools allowing AI agents to hold assets and execute transactions within predefined controls.
The strategy is significant given USDC’s existing scale. Circle reported $73.3 billion of USDC in circulation at the end of the second quarter of 2026, while quarterly onchain USDC transaction volume reached $14.8 trillion. Arc therefore gives Circle a network designed specifically around financial activity already occurring through its stablecoin ecosystem.
CLARITY Setback Adds Regulatory Context
The launch also comes immediately after the U.S. Senate failed to advance the Digital Asset Market Clarity Act, leaving comprehensive federal crypto market-structure legislation stalled.
That setback does not directly determine Arc’s operation, but it highlights the regulatory environment facing companies building blockchain-based financial infrastructure in the United States.
Arc is entering an increasingly competitive field that includes Ethereum Layer 2 networks and newer stablecoin-focused blockchains. Its main differentiator is the combination of USDC settlement, EVM compatibility and direct participation from established financial institutions.
Conclusion
Arc’s mainnet launch moves Circle further beyond its original role as a stablecoin issuer. With BlackRock, DTCC, Mastercard, Visa and other major institutions participating as founding validators, Circle is attempting to build blockchain infrastructure that connects traditional finance with tokenized markets.
The next test is adoption. Arc already has institutional participants and established DeFi integrations, but its longer-term significance will depend on whether meaningful payment, trading, collateral and tokenized-asset activity actually moves onto the network.
For Circle, the September 16 launch establishes the infrastructure. Transaction volume, institutional deployment and USDC usage on Arc will determine whether that infrastructure becomes a major financial settlement network.
Sources & Methodology
Primary-source standard: Market-moving facts should link to original data releases, regulator notices, company filings or official project announcements whenever available. Secondary reporting is used for additional context, not as a substitute for original evidence.
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