Circle has officially launched a new blockchain platform named Arc, tailored specifically for stablecoin-focused applications. As a Layer-1 network, Arc is designed to optimize the use of stablecoins like USDC, aiming to address infrastructure challenges that have hindered broader institutional adoption. The network leverages USDC for transaction fees and incorporates a built-in foreign exchange engine, while also providing optional privacy features for enhanced compliance in sensitive transactions.
The company plans a public testnet rollout later this year, with a mainnet beta slated for 2026. The initiative comes in the wake of increasing interest in stablecoins following the passage of the GENIUS Act in July 2025, which has set the stage for wider institutional engagement.
According to Rachel Mayer, VP of Product Management at Circle, enterprises have historically faced hurdles such as unpredictable fees, uncertain settlement times, and inadequate privacy controls while using stablecoins across various networks. Arc aims to resolve these issues by implementing deterministic finality for transactions, predictable fees in stablecoins, and enhanced privacy features that accommodate regulatory needs.
Arc’s development is structured in three phases: a private testnet that began in August 2025, the anticipated public testnet in Fall 2025, and a scheduled mainnet beta launch in 2026. The network utilizes USDC as its native gas currency, eliminating the necessity to rely on volatile tokens for transaction fees. The fee model is based on an adapted architecture reminiscent of Ethereum’s EIP-1559, aiming to reduce fee volatility by leveraging a weighted moving average of network demand.
The consensus mechanism of Arc is powered by Malachite, a Byzantine Fault Tolerant (BFT) engine, which currently employs a permissioned validator system focusing on geographic distribution and regulatory compliance. Circle envisions a future transition to a permissioned Proof-of-Stake model to enhance stability and security further. To mitigate potential abuses, Circle is developing features like encrypted mempools and batch transaction processing to ensure equitable execution for financial applications.
Arc also includes a modular privacy system that facilitates compliance while preserving confidentiality. Initially, this system will feature confidential transfers that conceal transaction amounts while maintaining visibility of addresses. Advanced functionalities, such as zero-knowledge proofs and multi-party computation, are planned for future integration, allowing institutions to selectively share information with regulators or auditors.
The network promises advantages for financial institutions by providing dollar-denominated transaction fees that are auditable and stable, offering a more predictable environment compared to speculative token models. Circle aims to leverage its position as the issuer of USDC to build a purpose-specific blockchain that can expand the utility of stablecoins into areas such as real-time settlement and tokenization.
In a landscape rife with competitors—including established public Layer-1 chains like Bitcoin, Ethereum, and emerging stablecoin-focused platforms—Arc’s unique proposition is its strategic focus on compliance and institutional requirements. By facilitating interoperability between fiat currencies and USDC across various networks, Arc aims to strengthen the multichain ecosystem, unlocking new use cases and opportunities for institutional liquidity on-chain.
