## Arc: Circle’s Stablecoin-Optimized Blockchain — Key Details and Insights
Arc is a blockchain platform created by Circle, the company behind the USDC stablecoin, designed specifically for stablecoin-focused applications. Unlike general-purpose blockchains such as Ethereum or Solana, Arc is a layer-1 network built to address the unique needs of stablecoins at scale. It leverages USDC for gas fees, includes a native FX engine, and supports opt-in privacy features. With a public mainnet launch scheduled for September 16, 2026, and the introduction of the ARC token, Circle aims to provide a more predictable, compliant, and efficient infrastructure for institutional and developer use.
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### Why Circle Built Arc
Stablecoins have seen significant growth in adoption, especially after the passage of the GENIUS Act in mid-2025. However, Circle argues that many existing blockchains were not designed with stablecoins in mind, leading to issues such as fee volatility, probabilistic settlement, limited privacy, and fragmented liquidity.
Arc was developed to overcome these challenges by offering:
– **Deterministic finality** for instant and irreversible transaction settlement
– **Predictable, stablecoin-priced fees**
– **Opt-in privacy tools** that support regulatory compliance
– **Built-in interoperability** with other blockchains and traditional financial systems
The platform has been in private mainnet testing with over 100 institutional and ecosystem builders and has already processed more than 500 million transactions across nearly 3 million wallets during its testnet phase.
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### USDC as Native Gas
Arc uses USDC as its native gas, removing the need for volatile tokens to pay transaction fees. This design helps keep fees low, predictable, and denominated in a stable currency. The fee model is based on an updated version of Ethereum’s EIP-1559 mechanism but smoothed using a weighted moving average of network demand.
Other stablecoins can also be used as gas through a paymaster system. This approach enables:
– Dollar-based, auditable fee structures
– Reduced friction for financial institutions
– Seamless integration with Circle’s CCTP and Gateway interoperability services
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### Deterministic Settlement and Consensus
Arc’s consensus mechanism is powered by Malachite, a Byzantine Fault Tolerant (BFT) system derived from Tendermint. Validator selection is currently permissioned and based on criteria such as operational resilience, geographic distribution, and regulatory compliance.
Notable validators set to secure the network at launch include:
– BlackRock
– DTCC
– Galaxy
– Global Payments
– ICE
– Mastercard
– MoneyGram
– SBI Group
– Standard Chartered
– Sumitomo Corporation
– Visa
Future plans include transitioning to a permissioned Proof-of-Stake model. Additional anti-abuse measures, such as encrypted mempools and batch processing, are being developed to ensure fair and secure execution.
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### What Runs on Arc at Launch
At launch, Arc is expected to host several major DeFi protocols and partners, including:
– **DeFi protocols**: Aave, Morpho, and Uniswap
– **Access and infrastructure partners**: Binance Wallet, Chainlink, Fireblocks, Kraken, Ledger, MetaMask, and Upbit
– **Payments providers**: Rain, Thunes, and Wirex
Institutional applications are also in development, such as:
– BlackRock’s BUIDL tokenized money market fund
– DTCC’s tokenized asset custody solutions (planned for late 2027)
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### The ARC Token
The ARC token serves as the native coordination mechanism for the Arc network. It will be used for:
– Staking and governance
– Discounted transaction rates
– Preferential access to ecosystem services
Key details about the ARC token include:
– Initial supply: 10 billion tokens
– Annual issuance: 2–3%
– Long-term goal: Inflation neutrality
– Allocation:
– 60% to ecosystem development
– 25% to Circle
– 15% to a long-term reserve
The token has already contributed to Circle’s revenue growth, with a significant increase in other income reported in Q2 2026.
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### Opt-In Privacy for Institutions
Arc includes a modular privacy framework designed to balance compliance with confidentiality. Features include:
– **Confidential transfers** that hide transaction amounts while keeping addresses visible
– **Selective data disclosure** via view keys for regulators or auditors
Future privacy enhancements may include:
– Private state and confidential computation
– Zero-knowledge proofs (ZKPs)
– Multi-party computation (MPC)
– Fully homomorphic encryption (FHE)
Circle’s interoperability tools—Mint, CCTP, and Gateway—help bridge fiat and USDC across Arc and other chains.
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### FAQ
**What is Arc?**
Arc is a blockchain platform built by Circle to support stablecoin-focused applications. It uses USDC for gas, offers deterministic settlement, and includes optional privacy features.
**When will Arc’s mainnet launch?**
Public mainnet is scheduled for September 16, 2026.
**What is the ARC token used for?**
The ARC token acts as the network’s coordination mechanism, enabling staking, governance, discounted fees, and preferential access to services.
**Who are Arc’s founding validators?**
Arc’s founding validators include major institutions such as BlackRock, DTCC, Galaxy, Mastercard, Visa, and others.
**Does Arc support privacy?**
Yes, Arc offers opt-in privacy features such as confidential transfers and plans to support zero-knowledge proofs and other advanced privacy tools over time.
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### Conclusion
Arc represents Circle’s next-generation approach to blockchain infrastructure tailored for stablecoin adoption. By combining USDC-based gas, deterministic settlement, institutional-grade privacy, and deep interoperability, Arc aims to bridge the gap between traditional finance and blockchain-based payments. With a strong validator roster and early ecosystem momentum, Arc positions itself as a purpose-built layer for compliant, scalable, and efficient stablecoin use cases. As the public mainnet launch approaches in 2026, Arc could play a key role in accelerating institutional adoption of blockchain technology.
