> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arc.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Contract addresses

> Arc Testnet contract addresses for USDC, EURC, USYC, CCTP, Gateway, StableFX, transaction extensions (Memo, Multicall3From), and common Ethereum contracts (CREATE2, Multicall3, Permit2).

<Note>
  All addresses on this page are for **Arc Testnet**. Mainnet addresses are not
  yet available.
</Note>

## 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.

### 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. See
[Stablecoin native model](/arc/concepts/stablecoin-native-model) for details on
how the native and ERC-20 interfaces share the same underlying balance.

| Contract | Address                                                                                                                        | Notes                                                                                    |
| :------- | :----------------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------- |
| **USDC** | [`0x3600000000000000000000000000000000000000`](https://testnet.arcscan.app/address/0x3600000000000000000000000000000000000000) | Optional ERC-20 interface for interacting with the native USDC balance. Uses 6 decimals. |

<Info>
  **Getting testnet USDC:** You can request USDC on Arc Testnet from the
  [Circle Faucet](https://faucet.circle.com/). 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.
</Info>

### EURC

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

| Contract | Address                                                                                                                        | Notes                                      |
| :------- | :----------------------------------------------------------------------------------------------------------------------------- | :----------------------------------------- |
| **EURC** | [`0x89B50855Aa3bE2F677cD6303Cec089B5F319D72a`](https://testnet.arcscan.app/address/0x89B50855Aa3bE2F677cD6303Cec089B5F319D72a) | Main EURC token contract. Uses 6 decimals. |

<Info>
  **Getting testnet EURC:** Testnet EURC can be requested from the [Circle
  Faucet](https://faucet.circle.com/). Select **Arc Testnet** as the network and
  **EURC** as the token to receive a small test allocation.
</Info>

### USYC

[USYC](https://developers.circle.com/tokenized/usyc/overview) 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.

<Note>
  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](https://help.circle.com/s/article/Document-certification-requirements-for-USYC-onboarding?language=en_US\&category=USYC)
  for more information.
</Note>

| Contract         | Address                                                                                                                        | Notes                                                                                              |
| :--------------- | :----------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------- |
| **USYC**         | [`0xe9185F0c5F296Ed1797AaE4238D26CCaBEadb86C`](https://testnet.arcscan.app/address/0xe9185F0c5F296Ed1797AaE4238D26CCaBEadb86C) | The main USYC token contract representing tokenized money market fund shares. Uses 6 decimals.     |
| **Entitlements** | [`0xcc205224862c7641930c87679e98999d23c26113`](https://testnet.arcscan.app/address/0xcc205224862c7641930c87679e98999d23c26113) | Manages allowlisted access and entitlement controls for permissioned addresses on the Arc Testnet. |
| **Teller**       | [`0x9fdF14c5B14173D74C08Af27AebFf39240dC105A`](https://testnet.arcscan.app/address/0x9fdF14c5B14173D74C08Af27AebFf39240dC105A) | Contract used to mint and redeem testnet USYC from testnet USDC once your wallet is allowlisted.   |

<Info>
  **Getting testnet USYC:**

  1. Obtain testnet USDC from the [Circle Faucet](https://faucet.circle.com/).
  2. Request allowlisting by opening a ticket with
     [Circle Support](https://support.circle.com/) and include your Arc Testnet
     wallet address. Requests are typically processed in 24–48 hours.
  3. Once approved, call the USYC Teller contract or interact with the
     [USYC Portal](https://usyc.dev.hashnote.com/) to deposit testnet USDC and
     receive testnet USYC.

  For more information on issuance, redemption, and eligibility, see
  [USYC Overview](https://developers.circle.com/tokenized/usyc/overview).
</Info>

## Crosschain

The contracts below enable crosschain interoperability between Arc and other
blockchains through Circle's
[Cross-Chain Transfer Protocol](https://developers.circle.com/cctp) (CCTP) and
[Gateway](https://developers.circle.com/gateway). CCTP handles crosschain
message passing and stablecoin transfers, while Gateway provides
chain-abstracted USDC balances for seamless liquidity movement.

### CCTP

| Contract                 | Domain | Address                                                                                                                        |
| :----------------------- | :----- | :----------------------------------------------------------------------------------------------------------------------------- |
| **TokenMessengerV2**     | 26     | [`0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA`](https://testnet.arcscan.app/address/0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA) |
| **MessageTransmitterV2** | 26     | [`0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275`](https://testnet.arcscan.app/address/0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275) |
| **TokenMinterV2**        | 26     | [`0xb43db544E2c27092c107639Ad201b3dEfAbcF192`](https://testnet.arcscan.app/address/0xb43db544E2c27092c107639Ad201b3dEfAbcF192) |
| **MessageV2**            | 26     | [`0xbaC0179bB358A8936169a63408C8481D582390C4`](https://testnet.arcscan.app/address/0xbaC0179bB358A8936169a63408C8481D582390C4) |

### Gateway

| Contract          | Domain | Address                                                                                                                        |
| :---------------- | :----- | :----------------------------------------------------------------------------------------------------------------------------- |
| **GatewayWallet** | 26     | [`0x0077777d7EBA4688BDeF3E311b846F25870A19B9`](https://testnet.arcscan.app/address/0x0077777d7EBA4688BDeF3E311b846F25870A19B9) |
| **GatewayMinter** | 26     | [`0x0022222ABE238Cc2C7Bb1f21003F0a260052475B`](https://testnet.arcscan.app/address/0x0022222ABE238Cc2C7Bb1f21003F0a260052475B) |

## 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.

### StableFX

[StableFX](https://developers.circle.com/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.

| Contract     | Address                                                                                                                        | Notes                                                                          |
| ------------ | ------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------ |
| **FxEscrow** | [`0x867650F5eAe8df91445971f14d89fd84F0C9a9f8`](https://testnet.arcscan.app/address/0x867650F5eAe8df91445971f14d89fd84F0C9a9f8) | The escrow contract used by both makers and takers to settle stablecoin swaps. |

<Info>
  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 [Common Ethereum contracts](#common-ethereum-contracts) for the
  Permit2 address.
</Info>

## Common Ethereum contracts

Arc Testnet 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.

| Contract                       | Address                                                                                                                        | Notes                                                                           |
| :----------------------------- | :----------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------ |
| **CREATE2 Factory (Arachnid)** | [`0x4e59b44847b379578588920cA78FbF26c0B4956C`](https://testnet.arcscan.app/address/0x4e59b44847b379578588920cA78FbF26c0B4956C) | Minimal proxy for deterministic contract deployment using the `CREATE2` opcode. |
| **Multicall3**                 | [`0xcA11bde05977b3631167028862bE2a173976CA11`](https://testnet.arcscan.app/address/0xcA11bde05977b3631167028862bE2a173976CA11) | Aggregates multiple read calls into a single call for efficient data retrieval. |
| **Permit2**                    | [`0x000000000022D473030F116dDEE9F6B43aC78BA3`](https://testnet.arcscan.app/address/0x000000000022D473030F116dDEE9F6B43aC78BA3) | Universal contract for signature-based token approvals. Required for StableFX.  |

## Test addresses for restricted transfer behavior

To help you exercise the value transfer revert paths described in
[EVM differences](/arc/references/evm-differences#value-transfer-rules), 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:

```bash theme={null}
cast wallet private-key --mnemonic "test test test test test test test test test test test junk" --mnemonic-index 1
```

| Purpose         | Mnemonic index | Address                                                                                                                        | Behavior                                                                                                                        |
| :-------------- | :------------- | :----------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------ |
| **Blocklisted** | 1              | [`0x70997970C51812dc3A010C7d01b50e0d17dc79C8`](https://testnet.arcscan.app/address/0x70997970C51812dc3A010C7d01b50e0d17dc79C8) | A value transfer to or from this address reverts at runtime, including when the address is the beneficiary of a `SELFDESTRUCT`. |

Use this address to confirm your contract handles a runtime revert on a value
transfer (including as a `SELFDESTRUCT` beneficiary). See
[EVM differences](/arc/references/evm-differences#value-transfer-rules) for the
full set of rules.