# MetaMask Quick Start for ChainID 138

Quick reference for adding ChainID 138 to MetaMask and adding tokens.

## Add Network to MetaMask

### Method 1: Using the SDK

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

await addOrSwitchNetwork();
```

### Method 2: Using wallet_addEthereumChain

```javascript
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'],
    blockExplorerUrls: ['https://explorer.d-bis.org']
  }]
});
```

### Method 3: Using Chainlist

1. Visit [chainlist.org](https://chainlist.org)
2. Search for "ChainID 138" or "DeFi Oracle Meta"
3. Click "Add to MetaMask"

### Method 4: Switch to ChainID 138

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

## Add Token to MetaMask

### Using the SDK

```typescript
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)

```javascript
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'
    }
  }
});
```

## Network Information

- **ChainID**: 138 (0x8a)
- **Chain Name**: DeFi Oracle Meta Mainnet
- **Native Currency**: ETH (18 decimals)
- **RPC URL**: `https://rpc.d-bis.org`
- **Block Explorer**: `https://explorer.d-bis.org`

## Common Tokens

### WETH (Wrapped Ether)

- **Address**: `0x...` (Update after deployment)
- **Symbol**: WETH
- **Decimals**: 18

## Troubleshooting

### MetaMask not detected

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

### Network already added

If the network is already added, use `wallet_switchEthereumChain` instead:

```javascript
try {
  await window.ethereum.request({
    method: 'wallet_switchEthereumChain',
    params: [{ chainId: '0x8a' }]
  });
} catch (error) {
  // Network not added, add it
  if (error.code === 4902) {
    await window.ethereum.request({
      method: 'wallet_addEthereumChain',
      params: [/* network metadata */]
    });
  }
}
```

## Links

- [MetaMask Documentation](https://docs.metamask.io)
- [Chainlist](https://chainlist.org/chain/138)
- [Explorer](https://explorer.d-bis.org)