Networks and environment

Every transfer has a source and a destination network. You name them by id. To avoid loose strings, the SDK exports every id as a constant on NetworkId, and every environment on Environment.

Environment

import { Environment } from "@zethub/bridge";

Environment.TESTNET; // Circle sandbox networks
Environment.MAINNET; // production networks

The environment is chosen at construction and is immutable on an instance. Build two instances if you need both.

Referencing a network

import { NetworkId, ZetHubBridge } from "@zethub/bridge";

const sdk = new ZetHubBridge({ environment: Environment.TESTNET });
const chains = await sdk.chainDetailsMap();

const base = chains[NetworkId.BASE_SEPOLIA].network;
const stellar = chains[NetworkId.STELLAR_TESTNET].network;

Testnet

Constant	id	CCTP domain	EVM chain id
`NetworkId.ETHEREUM_SEPOLIA`	`ethereum-sepolia`	0	11155111
`NetworkId.AVALANCHE_FUJI`	`avalanche-fuji`	1	43113
`NetworkId.OPTIMISM_SEPOLIA`	`optimism-sepolia`	2	11155420
`NetworkId.ARBITRUM_SEPOLIA`	`arbitrum-sepolia`	3	421614
`NetworkId.BASE_SEPOLIA`	`base-sepolia`	6	84532
`NetworkId.POLYGON_AMOY`	`polygon-amoy`	7	80002
`NetworkId.STELLAR_TESTNET`	`stellar-testnet`	27	n/a

Mainnet

Constant	id	CCTP domain	EVM chain id
`NetworkId.ETHEREUM`	`ethereum`	0	1
`NetworkId.AVALANCHE`	`avalanche`	1	43114
`NetworkId.OPTIMISM`	`optimism`	2	10
`NetworkId.ARBITRUM`	`arbitrum`	3	42161
`NetworkId.BASE`	`base`	6	8453
`NetworkId.POLYGON`	`polygon`	7	137
`NetworkId.UNICHAIN`	`unichain`	10	130
`NetworkId.LINEA`	`linea`	11	59144
`NetworkId.CODEX`	`codex`	12	81224
`NetworkId.SONIC`	`sonic`	13	146
`NetworkId.WORLDCHAIN`	`worldchain`	14	480
`NetworkId.SEI`	`sei`	16	1329
`NetworkId.HYPEREVM`	`hyperevm`	19	999
`NetworkId.STELLAR`	`stellar`	27	n/a

The `Network` object

Each entry in chainDetailsMap() exposes the raw Network value under .network:

class Network {
  readonly id: string;
  readonly name: string;
  readonly shortName: string;
  readonly family: ChainFamily;         // "evm" | "stellar"
  readonly environment: Environment;
  readonly cctpDomain: number;
  readonly evmChainId?: number;
  readonly stellarPassphrase?: string;
  readonly tokens: readonly TokenAsset[];
  readonly defaultAsset: AssetSymbol;
  readonly tokenMessenger: string;
  readonly messageTransmitter: string;
  readonly cctpForwarder?: string;
  readonly rpcUrls: readonly string[];
  readonly explorerUrl: string;
  readonly accentColor: string;

  hasToken(symbol: AssetSymbol): boolean;
  token(symbol?: AssetSymbol): TokenAsset;
  isEvm(): boolean;
  isStellar(): boolean;
}

The contract addresses for each network are on the Contracts page.