# WETH9/WETH10 Wrap/Unwrap Utilities - Complete ✅

**Date**: December 23, 2025  
**Status**: ✅ **COMPLETE**  
**Location**: https://explorer.d-bis.org/

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## ✅ WETH Utilities Added

### Features

1. **WETH9 Wrap/Unwrap Interface**
   - Wrap native ETH → WETH9
   - Unwrap WETH9 → native ETH
   - Real-time balance display
   - MAX button for quick selection

2. **WETH10 Wrap/Unwrap Interface**
   - Wrap native ETH → WETH10
   - Unwrap WETH10 → native ETH
   - Real-time balance display
   - MAX button for quick selection

3. **MetaMask Integration**
   - Automatic MetaMask connection
   - Chain 138 network detection
   - Automatic network switching
   - Account change detection
   - Transaction signing and submission

4. **User Experience**
   - Real-time balance updates
   - Transaction status feedback
   - Error handling and alerts
   - Loading states during transactions
   - Success confirmations

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## 📋 Contract Information

### WETH9
- **Address**: `0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2`
- **Standard**: ERC-20 Wrapped Ether (WETH9)
- **Functions**: `deposit()`, `withdraw(uint256)`

### WETH10
- **Address**: `0xf4BB2e28688e89fCcE3c0580D37d36A7672E8A9f`
- **Standard**: ERC-20 Wrapped Ether (WETH10)
- **Functions**: `deposit()`, `withdraw(uint256)`

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## 🎯 How to Use

### Step 1: Connect MetaMask
1. Visit https://explorer.d-bis.org/
2. Click **"WETH"** in the navigation bar
3. Click **"Connect MetaMask"** button
4. Approve the connection in MetaMask
5. If prompted, add Chain 138 network (automatic)

### Step 2: Select Token
- Choose **WETH9** or **WETH10** tab
- View your current balances (ETH and WETH)

### Step 3: Wrap ETH
1. Enter the amount of ETH to wrap
2. Click **"MAX"** to use your full ETH balance (optional)
3. Click **"Wrap ETH to WETH9/WETH10"** button
4. Confirm the transaction in MetaMask
5. Wait for transaction confirmation
6. Balances update automatically

### Step 4: Unwrap WETH
1. Enter the amount of WETH to unwrap
2. Click **"MAX"** to unwrap your full WETH balance (optional)
3. Click **"Unwrap WETH9/WETH10 to ETH"** button
4. Confirm the transaction in MetaMask
5. Wait for transaction confirmation
6. Balances update automatically

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## 🔧 Technical Details

### Web3 Integration
- **Library**: Ethers.js v5.7.2
- **Provider**: MetaMask Web3Provider
- **RPC Endpoint**: https://rpc-core.d-bis.org (Chain 138)

### Smart Contract Functions

#### WETH9/WETH10 Standard Functions
```solidity
// Wrap ETH to WETH
function deposit() payable

// Unwrap WETH to ETH
function withdraw(uint256 wad)

// Check balance
function balanceOf(address account) view returns (uint256)
```

### Transaction Flow

1. **Wrap ETH**:
   - User enters ETH amount
   - Calls `deposit()` with ETH value
   - Receives WETH tokens
   - Balance updates automatically

2. **Unwrap WETH**:
   - User enters WETH amount
   - Calls `withdraw(amount)`
   - Receives native ETH
   - Balance updates automatically

---

## 🎨 Interface Features

### Balance Display
- **ETH Balance**: Shows native ETH balance
- **WETH Balance**: Shows WETH9 or WETH10 balance
- **Auto-refresh**: Updates after transactions
- **Manual Refresh**: Refresh button available

### Form Features
- **Amount Input**: Decimal input for precise amounts
- **MAX Button**: Quickly select maximum balance
- **Validation**: Prevents invalid amounts
- **Transaction Feedback**: Loading, success, error states

### MetaMask Status
- **Connection Status**: Shows connected/disconnected state
- **Account Display**: Shows connected address (shortened)
- **Network Detection**: Automatically switches to Chain 138
- **Auto-reconnect**: Maintains connection across page reloads

---

## 🔒 Security Features

1. **Transaction Validation**
   - Amount validation before submission
   - Balance checks (can't wrap more than available)
   - Transaction confirmation required

2. **MetaMask Security**
   - All transactions require MetaMask approval
   - User confirms each transaction
   - Private keys never exposed

3. **Error Handling**
   - Clear error messages
   - Transaction failure handling
   - Network error recovery

---

## 📊 Usage Examples

### Wrap 1 ETH to WETH9
1. Connect MetaMask
2. Go to WETH9 tab
3. Enter `1.0` in wrap amount field
4. Click "Wrap ETH to WETH9"
5. Confirm in MetaMask
6. Wait for confirmation

### Unwrap All WETH10
1. Connect MetaMask
2. Go to WETH10 tab
3. Click "MAX" in unwrap section
4. Click "Unwrap WETH10 to ETH"
5. Confirm in MetaMask
6. Wait for confirmation

---

## ✅ Features Summary

### Core Functionality
- ✅ Wrap ETH → WETH9
- ✅ Unwrap WETH9 → ETH
- ✅ Wrap ETH → WETH10
- ✅ Unwrap WETH10 → ETH

### User Experience
- ✅ Real-time balance display
- ✅ MAX button for quick selection
- ✅ Transaction status feedback
- ✅ Automatic balance refresh
- ✅ Error handling and alerts

### Integration
- ✅ MetaMask wallet integration
- ✅ Chain 138 network support
- ✅ Automatic network switching
- ✅ Account change detection

### Interface
- ✅ Clean, modern design
- ✅ Intuitive tab navigation
- ✅ Information tab with instructions
- ✅ Responsive layout

---

## 🎯 Access

**URL**: https://explorer.d-bis.org/

**Navigation**: Click **"WETH"** in the navigation bar

**Requirements**:
- MetaMask browser extension installed
- Chain 138 network configured (auto-added if needed)
- ETH balance in wallet for wrapping
- WETH balance in wallet for unwrapping

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## 📝 Notes

### Why Wrap ETH?
- **DeFi Compatibility**: Many DeFi protocols require ERC-20 tokens
- **Cross-Chain Bridging**: WETH can be bridged to other chains
- **Smart Contract Usage**: ETH can't be directly used in many smart contracts

### WETH9 vs WETH10
- **WETH9**: Standard wrapped ETH (compatible with most protocols)
- **WETH10**: Alternative wrapped ETH implementation
- Both can be used for cross-chain bridging via CCIP

### Transaction Costs
- Wrap/unwrap transactions require gas fees
- Fees are paid in native ETH
- Transaction costs are minimal for wrap/unwrap operations

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## ✅ Summary

**WETH Utilities**: ✅ **FULLY OPERATIONAL**

**Features**:
- ✅ Complete wrap/unwrap functionality
- ✅ MetaMask integration
- ✅ Real-time balance tracking
- ✅ User-friendly interface
- ✅ Automatic network detection
- ✅ Transaction status feedback

**Access**: https://explorer.d-bis.org/ → Click **"WETH"**

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**Last Updated**: December 23, 2025  
**Status**: ✅ **WETH utilities fully operational**

