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    Network Details

    This page provides a complete reference for the Liberty Chain Testnet network configuration, including connection details, system contract addresses, and infrastructure endpoints.

    Network Configuration

    Liberty Chain Testnet

    Chain Name
    Liberty Chain Testnet
    Chain ID
    76847801
    RPC URL
    https://testnet-rpc.lcx.com
    Block Explorer
    https://testnet-explorer.lcx.com
    Bridge
    https://chain.lcx.com/bridge
    Currency
    ETH
    Block Time
    2 seconds

    Chain Details

    StackOP Stack (Optimism)
    L1 Settlement LayerEthereum Sepolia
    Rollup TypeOptimistic Rollup
    EVM CompatibilityEthereum-equivalent
    Block Time2 seconds
    Native CurrencyETH (18 decimals)
    Chain ID (Decimal)76847801
    Chain ID (Hex)0x4949AB9

    Infrastructure Endpoints

    ServiceURL
    JSON-RPC (HTTPS)https://testnet-rpc.lcx.com
    WebSocketwss://testnet-rpc.lcx.com
    Block Explorerhttps://testnet-explorer.lcx.com
    Explorer APIhttps://testnet-explorer.lcx.com/api
    Bridgehttps://chain.lcx.com/bridge

    System Contract Addresses

    Liberty Chain uses the standard OP Stack pre-deployed system contracts. These contracts are deployed at deterministic addresses that are the same across all OP Stack chains.

    ContractAddress
    L2CrossDomainMessenger0x4200000000000000000000000000000000000007
    L2StandardBridge0x4200000000000000000000000000000000000010
    GasPriceOracle0x420000000000000000000000000000000000000F
    L2ToL1MessagePasser0x4200000000000000000000000000000000000016
    L1Block0x4200000000000000000000000000000000000015
    L2ERC721Bridge0x4200000000000000000000000000000000000014

    Standard OP Stack Addresses

    These addresses follow the OP Stack convention where all system contracts live in the 0x4200...00XX address range. They are identical across all OP Stack chains, so if you have worked with Optimism, Base, or any other OP Stack chain, you already know these addresses.

    L1 Contract Addresses (Sepolia)

    These are the Liberty Chain rollup contracts deployed on Ethereum Sepolia. Developers building bridges, cross-chain messaging, or integrations will need these addresses.

    ContractAddress
    OptimismPortal0xc88823f0142f5c89273cb6d5b152f6177608a3e9
    L1StandardBridge0x79b2e9348a9ee24935a841cd03481680ed659f25
    L1CrossDomainMessenger0x3759d654dfeb592ed1077f26887c976d8615dac1
    DisputeGameFactory0xe63c6628df89e1471acc9e74c9574d4426431fda
    SystemConfig0x9c5fe840163db954dd56eab8102d683c6fd81f94
    L1ERC721Bridge0xe707d968bf2370e5fb2eddfd79c0d9904d37c25d
    OptimismMintableERC20Factory0x0284192b0856abc4b86abdea91d0c43470a60833
    AnchorStateRegistry0x0a66512812a7b525a1ad0aaf0f0ad9d31900821e

    Bridging Integration

    To bridge ERC-20 tokens to Liberty Chain, first deploy the L2 representation using the OptimismMintableERC20Factory on L2, then use the L1StandardBridge to deposit. See the Bridge Guide for details.

    Quick Connection Test

    Verify your connection by querying the chain ID:

    Verify connection
    bash
    curl -s -X POST https://testnet-rpc.lcx.com \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' | python3 -m json.tool

    The response should return 0x4949AB9 (76847801 in decimal), confirming you are connected to Liberty Chain Testnet.

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