Addresses and chain

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.

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
Native gas token	USDC (18-decimal native value)

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.

Utter contracts

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

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

See 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`

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

HTTP APIs

On-chain

SDK and config

Appendix

Addresses and chain

Network

Utter contracts

Tokens and shared infrastructure

Circle Gateway, CCTP and StableFX

Roles

​Network

​Utter contracts

​Tokens and shared infrastructure

​Circle Gateway, CCTP and StableFX

​Roles

Network

Utter contracts

Tokens and shared infrastructure

Circle Gateway, CCTP and StableFX

Roles