Arc vs Cardano: Two Stablecoin Settlement Models

Circle launched the public mainnet of Arc on September 16 with more than 100 applications and over 100 institutional and ecosystem participants. The release gives Circle a dedicated Layer 1 settlement network alongside blockchains such as Cardano, which connects to Circle through xReserve without adopting Arc’s validator or execution model.

Circle Launches Arc Mainnet

Arc’s founding validator cohort includes BlackRock, DTCC, ICE, Mastercard, Standard Chartered, Visa, MoneyGram and SBI Group.

The network currently uses a permissioned validator set operating under a proof of authority model. Arc also includes sanctions controls at the validator level as part of an infrastructure designed for banks, payment companies and regulated financial institutions.

Arc is compatible with the Ethereum Virtual Machine, allowing existing Solidity applications and development tools to connect without adopting a new technology stack. Aave, Morpho, Uniswap and several major wallet, custody and blockchain infrastructure providers are included in the initial ecosystem.

Circle has confirmed that Arc’s selective privacy features remain under development. The current mainnet primarily introduces stablecoin settlement, institutional validation, Circle payment products and developer tools.

Arc and Cardano Use Different Network Models

Arc and Cardano both support publicly accessible applications, but they use different validation and governance structures.

Arc currently depends on a selected group of known validators. Circle is exploring a transition toward proof of stake in 2027 and has completed the genesis mint of 10 billion ARC tokens. The token has not been publicly launched, while network fees continue to be paid in USDC.

Cardano already operates as an open proof of stake network where independent stake pool operators produce blocks. ADA is used for transaction fees, staking and governance, while Cardano’s extended UTXO architecture differs from Arc’s EVM model.

Arc provides a controlled network foundation designed around institutional requirements. Cardano allows broader participation in network validation without limiting block production to a predefined group of financial institutions.

USDCx Connects Cardano to Circle Liquidity

Cardano connects to Circle’s stablecoin infrastructure through USDCx and the xReserve system.

Circle’s xReserve holds USDC in a smart contract and allows a partner blockchain to issue its own stablecoin backed by those reserves on a one to one basis. Cardano is listed among the networks using this model.

USDCx is different from native USDC issued directly by Circle. The token is deployed through the partner blockchain’s infrastructure, while xReserve provides reserve backing, attestations and crosschain liquidity transfers without relying on a conventional third party bridge.

Arc’s launch adds a Circle led route for stablecoin settlement, supported by integrated liquidity products and institutional validators. Cardano remains outside that validation perimeter, using USDCx to access Circle backed liquidity while keeping fees, block production and application execution on its own network.