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Unlink is multichain. SDK clients connect to a hosted deployment by its environment name. Pass that name when you create a client, and use the matching chain ID when you derive an account with account.fromMetaMask.

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Environments

EnvironmentNetworkChain IDStatus
arc-testnetArc Testnet5042002Available
base-sepoliaBase Sepolia84532Available
ethereum-sepoliaEthereum Sepolia11155111Available
monad-testnetMonad Testnet10143Available
Only production environments are listed here. 
const client = createUnlinkClient({
  environment: "base-sepolia",
  account: unlinkAccount,
});
The chain ID you pass to account.fromMetaMask must match the environment’s chain. Deriving with the wrong chain ID produces a different account. See Accounts and keys for how derivation binds to chainId.

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Get testnet gas

Base Sepolia faucet

Get testnet ETH for gas on Base Sepolia.
Arc Testnet uses USDC as its native gas token. Fund a wallet with Arc USDC from the Circle faucet.