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

# Addresses and chain

> Arc Testnet network parameters and every pinned contract address Utter uses.

Utter runs on **Arc Testnet** only. Every address below is pinned in one place, `packages/chain/src/addresses.ts`, so a re-pin (for example a mainnet cut) touches a single file. Each Utter contract address links to the [ArcScan explorer](https://testnet.arcscan.app).

## Network

| Field            | Value                                                      |
| ---------------- | ---------------------------------------------------------- |
| Chain name       | Arc Testnet                                                |
| Chain id         | `5042002`                                                  |
| CAIP-2 network   | `eip155:5042002`                                           |
| RPC (HTTP)       | `https://rpc.testnet.arc.network`                          |
| RPC (WebSocket)  | `wss://rpc.testnet.arc.network`                            |
| Explorer         | [https://testnet.arcscan.app](https://testnet.arcscan.app) |
| Native gas token | USDC (18-decimal native value)                             |

<Warning>
  USDC at `0x3600…0000` is **both** the 6-decimal ERC-20 token and the 18-decimal native gas token. Always read `decimals()` at runtime for ERC-20 amount math. Never reuse the 18-decimal native gas lens for token amounts, and never hardcode `6`.
</Warning>

## Utter contracts

Deployed and verified on Arc Testnet (chain id `5042002`) via `contracts/script/Deploy.s.sol`.

| Contract         | Address                                                                                                                        | Purpose                                                                          |
| ---------------- | ------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------- |
| ResourceRegistry | [`0x12aafa5a70c3aD8Bd3a52252744f9F7Aa073E362`](https://testnet.arcscan.app/address/0x12aafa5a70c3aD8Bd3a52252744f9F7Aa073E362) | Per-resource config, indexer events, pause and slash authorization.              |
| PaymentEscrow    | [`0x87DDD6df70A5CDb5c161C65bfE15e0F6942DD154`](https://testnet.arcscan.app/address/0x87DDD6df70A5CDb5c161C65bfE15e0F6942DD154) | Primary money path: capped EIP-712 debit with the inline creator/treasury split. |
| StakingVault     | [`0x15573Cb5a391F1023317bd49b076A7FE664FdE8B`](https://testnet.arcscan.app/address/0x15573Cb5a391F1023317bd49b076A7FE664FdE8B) | Per-resource USDC bond custody and the insurance pool.                           |
| PaymentSplitter  | [`0x71375fC7cA1EA9d2f0dFc44d454B37AbD3cCe510`](https://testnet.arcscan.app/address/0x71375fC7cA1EA9d2f0dFc44d454B37AbD3cCe510) | Flat-path (`exact` scheme) splitter.                                             |

See [Contracts](/reference/contracts) for the ABIs and behavior.

## Tokens and shared infrastructure

| Contract        | Address                                      | Notes                                                      |
| --------------- | -------------------------------------------- | ---------------------------------------------------------- |
| USDC            | `0x3600000000000000000000000000000000000000` | 6-dp ERC-20 and 18-dp native gas token. Read `decimals()`. |
| EURC            | `0x89B50855Aa3bE2F677cD6303Cec089B5F319D72a` | 6-dp ERC-20. StableFX / EURC payouts.                      |
| Multicall3      | `0xcA11bde05977b3631167028862bE2a173976CA11` | Batched reads.                                             |
| Permit2         | `0x000000000022D473030F116dDEE9F6B43aC78BA3` | Signature approvals for the no-deposit metered path.       |
| CREATE2 Factory | `0x4e59b44847b379578588920cA78FbF26c0B4956C` | Deterministic deploys.                                     |

## Circle Gateway, CCTP and StableFX

Used by the chain-abstracted funding and EURC payout paths.

| Contract                  | Address                                      |
| ------------------------- | -------------------------------------------- |
| GatewayWallet             | `0x0077777d7EBA4688BDeF3E311b846F25870A19B9` |
| GatewayMinter             | `0x0022222ABE238Cc2C7Bb1f21003F0a260052475B` |
| CCTP TokenMessengerV2     | `0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA` |
| CCTP MessageTransmitterV2 | `0xE737e5cEBEEBa77EFE34D4aa090756590b1CE275` |
| CCTP TokenMinterV2        | `0xb43db544E2c27092c107639Ad201b3dEfAbcF192` |
| StableFX FxEscrow         | `0x867650F5eAe8df91445971f14d89fd84F0C9a9f8` |

The Arc CCTP destination domain is `26`.

## Roles

On testnet the owner, escrow admin (relayer), registry admin, and platform treasury are collapsed onto a single deployer EOA:

| Role                                  | Address                                                                                                                        |
| ------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ |
| Deployer / owner / relayer / treasury | [`0xDa8c5726f596E8dae99e6dDEBa8AEa1c8bE9A4a5`](https://testnet.arcscan.app/address/0xDa8c5726f596E8dae99e6dDEBa8AEa1c8bE9A4a5) |

<Note>
  A production deploy assigns these to distinct roles. On testnet they are one EOA for simplicity.
</Note>