chainId for API calls, EIP-712 signing, and on-chain transactions.
| Chain ID | Network | Environment |
|---|---|---|
| 421614 | Arbitrum Sepolia | Testnet |
| 42161 | Arbitrum One | Mainnet |
eip155:421614 on testnet and eip155:42161 on mainnet.
Contract addresses and deployment artifacts are listed per chain in the contracts repository (contracts/deployments/).