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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. The native balance, consistent with most EVM implementations, expresses the balance up to 18 decimals of precision. An optional USDC ERC-20 interface is also available for developers who need ERC-20 features such as transferFrom, approve, and allowance management. The ERC-20 function call directly affects native USDC balance movements.
ContractAddressDescription
USDC0x3600000000000000000000000000000000000000Optional ERC-20 interface for interacting with the native USDC balance. Uses 6 decimals.
Getting testnet USDC: You can request USDC on Arc Testnet from the Circle Faucet. USDC is required to pay for gas and interact with contracts on Arc.Note: As with any ERC-20 token, always use the decimals() function to interpret balances and transfer amounts accurately. On Arc, the native USDC gas token uses 18 decimals of precision, while the USDC ERC-20 interface uses 6 decimals. Avoid mixing these values directly, as doing so may result in incorrect balance handling. For applications integrating USDC, it’s recommended to rely solely on the standard ERC-20 interface for reading balances and sending transfers.

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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.
ContractAddressDescription
EURC0x89B50855Aa3bE2F677cD6303Cec089B5F319D72aMain EURC token contract. Uses 6 decimals.
Getting testnet EURC: Testnet EURC can be requested from the Circle Faucet. Select Arc Testnet as the network and EURC as the token to receive a small test allocation.

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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.
ContractAddressDescription
USYC0xe9185F0c5F296Ed1797AaE4238D26CCaBEadb86CThe main USYC token contract representing tokenized money market fund shares. Uses 6 decimals.
Entitlements0xcc205224862c7641930c87679e98999d23c26113Manages allowlisted access and entitlement controls for permissioned addresses on the Arc Testnet.
Teller0x9fdF14c5B14173D74C08Af27AebFf39240dC105AContract used to mint and redeem testnet USYC from testnet USDC once your wallet is allowlisted.
Getting testnet USYC:
  1. Obtain testnet USDC from the Circle Faucet.
  2. Request allowlisting by opening a ticket with Circle Support and include your Arc Testnet wallet address. Requests are typically processed in about 24–48 hours.
  3. Once approved, call the USYC Teller contract or interact with the USYC Portal to deposit testnet USDC and receive testnet USYC.
For more information on issuance, redemption, and eligibility, see USYC Overview.

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Crosschain

The contracts below 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

ContractDomainAddress
TokenMessengerV2260x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA
MessageTransmitterV2260xE737e5cEBEEBa77EFE34D4aa090756590b1CE275
TokenMinterV2260xb43db544E2c27092c107639Ad201b3dEfAbcF192
MessageV2260xbaC0179bB358A8936169a63408C8481D582390C4

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Gateway

ContractDomainAddress
GatewayWallet260x0077777d7EBA4688BDeF3E311b846F25870A19B9
GatewayMinter260x0022222ABE238Cc2C7Bb1f21003F0a260052475B

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Payments and settlement

Arc provides a suite of payment and settlement contracts that enable seamless stablecoin transfers, foreign exchange, and enterprise-grade transaction workflows. These components include StableFX and supporting contracts for allowance management.

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StableFX

StableFX is an institutional-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.
ContractAddressDescription
FxEscrow0x1f91886C7028986aD885ffCee0e40b75C9cd5aC1The escrow contract used by both makers and takers to settle stablecoin swaps

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Permit2

Permit2 is a token allowance management contract used by StableFX to manage USDC allowances for onchain settlement. The same Permit2 contract used across other EVM networks is also available on Arc Testnet.
ContractAddressDescription
Permit20x000000000022D473030F116dDEE9F6B43aC78BA3Standard Permit2 contract used to manage token allowances for StableFX transactions on Arc Testnet.
Note: The Permit2 contract is required when using StableFX on Arc. You must grant an allowance from your USDC token balance to the Permit2 contract before initiating FX transfers or swaps. For more details, see the Permit2 documentation.