Chain IDs

Complete reference for Monolythium chain identifiers.

!!! info "Canonical Source" The canonical source of truth for all network configuration values is the monolythium/networks repository. All tools (monoctl, monod) fetch configuration from this repository to prevent configuration drift.

Chain ID Summary

Network	Cosmos Chain ID	EVM Chain ID (Dec)	EVM Chain ID (Hex)
Localnet	mono-local-1	262145	0x40001
Sprintnet	mono-sprint-1	262146	0x40002
Testnet	mono-test-1	262147	0x40003
Mainnet	mono-1	262148	0x40004

Cosmos Chain IDs

Used for:

• Cosmos SDK transactions
• CLI commands
• Keplr/Leap wallet configuration
• CometBFT connections

Format: mono-<environment>-<version>

Verifying Chain ID

# Via RPC
curl -s localhost:26657/status | jq '.result.node_info.network'

# Via CLI
monod status | jq '.NodeInfo.network'

EVM Chain IDs

Used for:

• MetaMask network configuration
• EIP-155 transaction signing
• Smart contract deployment
• ethers.js/web3.js configuration

Verifying EVM Chain ID

curl -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
  localhost:8545

Response:

{"jsonrpc":"2.0","id":1,"result":"0x40002"}

Configuration Examples

MetaMask

Field	Sprintnet Value
Network Name	Monolythium Sprintnet
Chain ID	262146
Currency Symbol	LYTH

Hardhat

module.exports = {
  networks: {
    sprintnet: {
      chainId: 262146,
      url: "https://rpc.sprintnet.monolythium.com:8545"
    },
    testnet: {
      chainId: 262147,
      url: "https://rpc.testnet.monolythium.com:8545"
    },
    mainnet: {
      chainId: 262148,
      url: "https://rpc.monolythium.com:8545"
    }
  }
};

Keplr

{
  chainId: "mono-sprint-1",
  chainName: "Monolythium Sprintnet",
  // ...
}

Common Issues

Wrong Chain ID

If transactions fail with "Chain ID mismatch":

1. Verify you're using the correct chain ID for the network
2. Remove and re-add the network in your wallet
3. Reset the wallet connection

EVM vs Cosmos Confusion

Remember:

• Cosmos operations use string chain IDs (mono-sprint-1)
• EVM operations use numeric chain IDs (262146)

Both represent the same network.

Related

• Networks - Network overview
• MetaMask Setup - Wallet configuration