smom-dbis-138/docs/operations/integrations/METAMASK_INTEGRATION.md

MetaMask Integration Guide

Complete guide for integrating ChainID 138 (DeFi Oracle Meta Mainnet) with MetaMask.

Overview

This guide covers how to add ChainID 138 to MetaMask, add tokens, and integrate wallet functionality into your dapp.

Network Information

• ChainID: 138 (0x8a in hex)
• Chain Name: DeFi Oracle Meta Mainnet
• Native Currency: ETH (18 decimals)
• RPC URLs:
  • Primary: https://rpc.d-bis.org
  • Secondary: https://rpc2.d-bis.org
  • WebSocket: wss://rpc.d-bis.org
• Block Explorer: https://explorer.d-bis.org
• Domain: d-bis.org (Cloudflare DNS/SSL)

Adding the Network

Option 1: Using the MetaMask SDK

import { addOrSwitchNetwork } from '@defi-oracle/metamask-sdk';

// Add or switch to ChainID 138
await addOrSwitchNetwork();

Option 2: Using wallet_addEthereumChain

await window.ethereum.request({
  method: 'wallet_addEthereumChain',
  params: [{
    chainId: '0x8a',
    chainName: 'DeFi Oracle Meta Mainnet',
    nativeCurrency: {
      name: 'Ether',
      symbol: 'ETH',
      decimals: 18
    },
    rpcUrls: ['https://rpc.d-bis.org', 'https://rpc2.d-bis.org'],
    blockExplorerUrls: ['https://explorer.d-bis.org'],
    iconUrls: ['https://explorer.d-bis.org/images/logo.png']
  }]
});

Option 3: Using Chainlist

1. Visit chainlist.org
2. Search for "ChainID 138" or "DeFi Oracle Meta"
3. Click "Add to MetaMask"
4. Approve the network addition in MetaMask

Option 4: Manual Addition

1. Open MetaMask
2. Click the network dropdown
3. Click "Add Network"
4. Click "Add a network manually"
5. Enter the network details:
   • Network Name: DeFi Oracle Meta Mainnet
   • RPC URL: https://rpc.d-bis.org
   • Chain ID: 138
   • Currency Symbol: ETH
   • Block Explorer URL: https://explorer.d-bis.org

Switching Networks

await window.ethereum.request({
  method: 'wallet_switchEthereumChain',
  params: [{ chainId: '0x8a' }]
});

Adding Tokens

Using the SDK

import { addToken } from '@defi-oracle/metamask-sdk';

await addToken(
  '0xYourTokenAddress',
  'WETH',
  18,
  'https://explorer.d-bis.org/images/tokens/weth.png'
);

Using wallet_watchAsset (EIP-747)

await window.ethereum.request({
  method: 'wallet_watchAsset',
  params: {
    type: 'ERC20',
    options: {
      address: '0xYourTokenAddress',
      symbol: 'WETH',
      decimals: 18,
      image: 'https://explorer.d-bis.org/images/tokens/weth.png'
    }
  }
});

Checking Current Network

const chainId = await window.ethereum.request({ method: 'eth_chainId' });
if (chainId === '0x8a') {
  console.log('Connected to ChainID 138');
}

Listening to Network Changes

window.ethereum.on('chainChanged', (chainId) => {
  if (chainId === '0x8a') {
    console.log('Switched to ChainID 138');
  } else {
    console.log('Switched to another network');
  }
});

Complete Integration Example

async function connectToChain138() {
  // Check if MetaMask is installed
  if (typeof window.ethereum === 'undefined') {
    alert('Please install MetaMask');
    return;
  }

  try {
    // Get current chain ID
    const chainId = await window.ethereum.request({ method: 'eth_chainId' });

    // If not on ChainID 138, switch or add
    if (chainId !== '0x8a') {
      try {
        // Try to switch first
        await window.ethereum.request({
          method: 'wallet_switchEthereumChain',
          params: [{ chainId: '0x8a' }]
        });
      } catch (error) {
        // If switch fails, network might not be added
        if (error.code === 4902) {
          // Add the network
          await window.ethereum.request({
            method: 'wallet_addEthereumChain',
            params: [{
              chainId: '0x8a',
              chainName: 'DeFi Oracle Meta Mainnet',
              nativeCurrency: {
                name: 'Ether',
                symbol: 'ETH',
                decimals: 18
              },
              rpcUrls: ['https://rpc-http-pub.d-bis.org'],
              blockExplorerUrls: ['https://explorer.d-bis.org']
            }]
          });
        } else {
          throw error;
        }
      }
    }

    console.log('Connected to ChainID 138');
  } catch (error) {
    console.error('Error connecting to ChainID 138:', error);
  }
}

Token List

See the official token list at: metamask/token-list.json

Tokens are automatically detected by MetaMask when they appear on 2+ reputable token lists. To enable auto-detection:

1. Add your token to the official token list
2. Submit the token list to reputable aggregators (CoinGecko, etc.)
3. Ensure token metadata is available on Blockscout

Troubleshooting

MetaMask not detected

if (typeof window.ethereum === 'undefined') {
  alert('Please install MetaMask');
  window.open('https://metamask.io/download/', '_blank');
}

Network already added

If you get an error that the network is already added, use wallet_switchEthereumChain instead.

RPC endpoint errors

• Verify RPC URL is correct: https://rpc.d-bis.org
• Check network connectivity
• Verify RPC node is running and accessible
• Check firewall/security settings

Token not showing

• Verify token address is correct
• Check token contract is deployed on ChainID 138
• Verify token metadata (symbol, decimals) is correct
• Ensure token logo URL is accessible

Security Best Practices

1. Verify RPC URLs: Always use the official RPC URLs from this documentation
2. Verify Explorer URLs: Use the official Blockscout explorer
3. Verify Token Addresses: Double-check token contract addresses before adding
4. Avoid Phishing: Only add networks from trusted sources
5. Check Domain: Verify you're on the official domain (d-bis.org)

References

• MetaMask Documentation
• EIP-3085: wallet_addEthereumChain
• EIP-747: wallet_watchAsset
• Chainlist
• Blockscout Explorer