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Stablecoins

Stablecoins are the foundation of the Arc ecosystem, supporting a growing set of fiat-backed and yield-bearing tokens. These assets provide price stability, onchain yield, and multi-currency support for payments, FX, and financial applications. The ERC-20 functions affect native balance movements.

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USDC

USDC is the native EVM asset on Arc and is used for gas fees. An optional ERC-20 interface is also available for developers who need features such as transferFrom, approve, and allowance management. On other EVM blockchains, protocols typically deploy a WETH-style wrapper to give the native asset an ERC-20 interface; on Arc that step is unnecessary because the native USDC token already satisfies IERC20 directly. There is no wrapped USDC address on Arc. See Stablecoin native model for details on how the native and ERC-20 interfaces share the same underlying balance.

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EURC

EURC is the euro-denominated stablecoin issued by Circle and supported natively on Arc for use in payments, FX, and other financial applications.

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USYC

USYC is a yield-bearing token issued by Circle International Bermuda Ltd. and supported on Arc for institutional and DeFi use cases. It represents shares of a tokenized money market fund backed by short-duration U.S. Treasury securities, offering onchain access to regulated, low-risk yield.
USYC is only accessible to institutions outside the United States, subject to eligibility restrictions and a $100,000 USD minimum investment. See USYC Document Certification Requirements for more information.

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Wrapped assets

Wrapped assets are ERC-20 tokens that represent non-native assets bridged onto Arc. Each token is backed one-to-one by the corresponding asset held on its origin blockchain.

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cirBTC

cirBTC is Circle’s wrapped Bitcoin token on Arc. It uses the same FiatTokenProxy architecture as USDC and EURC and uses 8 decimals to match Bitcoin’s native precision.

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WETH

WETH on Arc is a bridged ERC-20 token. It is minted on Arc when ETH or WETH is locked on Ethereum, and uses 18 decimals.

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Crosschain

The following contracts enable crosschain interoperability between Arc and other blockchains through Circle’s Cross-Chain Transfer Protocol (CCTP) and Gateway. CCTP handles crosschain message passing and stablecoin transfers, while Gateway provides chain-abstracted USDC balances for seamless liquidity movement.

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CCTP

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Gateway

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Payments and settlement

Arc provides payment and settlement contracts that enable foreign exchange and onchain settlement workflows using stablecoins. These components support application-level use cases such as FX execution and escrow-based settlement.

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StableFX

StableFX is an enterprise-grade stablecoin FX engine that combines Request-for-Quote (RFQ) execution with onchain settlement on Arc. The following is the address for the escrow contract used to settle stablecoin swaps.
Before executing FX trades, StableFX must be able to transfer USDC from your wallet. To enable this, you need to grant a USDC allowance to the Permit2 contract. See the Common Ethereum contracts section for the Permit2 address.

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Transaction extensions

Arc provides predeployed contracts for attaching memos to transactions and batching calls with sender preservation. Both contracts route subcalls through the CallFrom precompile, which preserves the original msg.sender in each subcall.
Offchain blocklist operators: If you maintain an offchain blocklist or compliance screening system, you must include the Memo and Multicall3From contract addresses. These contracts preserve msg.sender through the CallFrom precompile, meaning the original caller’s address appears as the sender in subcalls. Your monitoring should account for transactions routed through these contracts to ensure blocklist enforcement is not bypassed.

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Common Ethereum contracts

Arc includes a set of widely used Ethereum ecosystem contracts for deterministic deployment, batched reads, and standardized token approvals. Although not Circle-managed, these contracts are deployed on Arc to ensure compatibility with common EVM tooling and workflows.

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Test addresses for restricted transfer behavior

To help you exercise the value transfer revert paths described in EVM differences, Arc Testnet seeds a well-known blocklisted address derived from the standard test mnemonic test test test test test test test test test test test junk. Because the mnemonic is public, you can derive its private key locally and sign as the address, for example with Foundry:
Use this address to confirm your contract handles a runtime revert on a value transfer (including as a SELFDESTRUCT beneficiary). See EVM differences for the full set of rules.