# Bridge Integration Guide for ChainID 138

Complete guide for integrating bridge functionality with MetaMask on ChainID 138.

## Overview

This guide covers bridge integration options for ChainID 138, enabling users to transfer assets between ChainID 138 and other networks.

## Bridge Options

### Option 1: Partner with Existing Bridge Providers

#### Recommended Providers

1. **LayerZero**
   - Cross-chain messaging protocol
   - Supports multiple chains
   - Well-established infrastructure
   - **Contact**: https://layerzero.network

2. **Wormhole**
   - Cross-chain bridge protocol
   - Supports 30+ chains
   - Security audited
   - **Contact**: https://wormhole.com

3. **Axelar**
   - Cross-chain communication
   - Supports multiple chains
   - Developer-friendly
   - **Contact**: https://axelar.network

4. **Stargate**
   - LayerZero-based bridge
   - Optimized for stablecoins
   - High liquidity
   - **Contact**: https://stargate.finance

#### Integration Steps

1. **Contact Bridge Provider**:
   - Request ChainID 138 integration
   - Provide network information
   - Discuss integration requirements

2. **Technical Requirements**:
   - RPC endpoints (provided)
   - Token contracts (deployed)
   - Network stability (verified)
   - Security audit (if required)

3. **Integration Process**:
   - Deploy bridge contracts on ChainID 138
   - Configure bridge endpoints
   - Test bridge functionality
   - Launch bridge

### Option 2: Implement Custom Bridge

#### Architecture

```
┌─────────────┐         ┌──────────────┐         ┌─────────────┐
│  ChainID 1  │ ──────► │ Bridge Router│ ◄────── │  ChainID    │
│ (Ethereum)  │         │              │         │    138       │
└─────────────┘         └──────────────┘         └─────────────┘
                              │
                              ▼
                        ┌──────────────┐
                        │  Validators  │
                        │  / Relayers  │
                        └──────────────┘
```

#### Components

1. **Lockbox Contract** (ChainID 138)
   - Locks tokens on source chain
   - Emits lock events
   - Handles unlocks

2. **Inbox Contract** (Destination Chain)
   - Receives bridge messages
   - Mints/burns tokens
   - Validates messages

3. **Bridge Router**
   - Routes messages between chains
   - Validates transactions
   - Manages liquidity

4. **Relayer Network**
   - Monitors lock events
   - Submits unlock transactions
   - Provides redundancy

#### Implementation Steps

1. **Deploy Contracts**:
   ```bash
   # Deploy Lockbox on ChainID 138
   forge script script/bridge/DeployLockbox.s.sol --rpc-url $RPC_URL_138
   
   # Deploy Inbox on destination chain
   forge script script/bridge/DeployInbox.s.sol --rpc-url $DEST_RPC
   ```

2. **Configure Bridge**:
   - Set up relayer network
   - Configure message routing
   - Set up monitoring

3. **Security Audit**:
   - Conduct security audit
   - Fix identified issues
   - Deploy audited contracts

4. **Testing**:
   - Test bridge functionality
   - Test edge cases
   - Test security scenarios

### Option 3: Use Bridge Aggregator

#### Aggregators

1. **Socket.tech**
   - Bridge aggregator
   - Supports multiple bridges
   - Best route selection
   - **Integration**: https://docs.socket.tech

2. **LI.FI**
   - Cross-chain bridge aggregator
   - Supports 30+ chains
   - SDK available
   - **Integration**: https://docs.li.fi

3. **Bungee Exchange**
   - Bridge aggregator
   - Supports multiple chains
   - Simple integration
   - **Integration**: https://docs.bungee.exchange

## MetaMask Bridge Integration

### Requirements

1. **Bridge Provider Partnership**:
   - Partner with bridge provider
   - Get bridge API access
   - Configure bridge endpoints

2. **Token Support**:
   - Supported tokens on both chains
   - Liquidity on both sides
   - Token metadata complete

3. **Security**:
   - Security audit completed
   - Monitoring in place
   - Risk management

4. **Consensys Approval**:
   - Submit bridge for MetaMask approval
   - Provide security documentation
   - Complete integration review

### Integration Process

1. **Phase 1: Bridge Setup** (Month 1-2)
   - Deploy bridge contracts
   - Configure bridge endpoints
   - Test bridge functionality

2. **Phase 2: Security Audit** (Month 2-3)
   - Conduct security audit
   - Fix identified issues
   - Deploy audited contracts

3. **Phase 3: MetaMask Integration** (Month 3-6)
   - Submit to MetaMask
   - Complete integration review
   - Test MetaMask integration
   - Launch bridge

## Bridge Configuration

### Supported Tokens

- **cUSDT**: Bridgeable to/from Ethereum Mainnet
- **cUSDC**: Bridgeable to/from Ethereum Mainnet
- **WETH**: Bridgeable to/from Ethereum Mainnet
- **LINK**: Bridgeable to/from Ethereum Mainnet

### Bridge Fees

- **Bridge Fee**: 0.1% - 0.5% (configurable)
- **Gas Fees**: Paid by user
- **Relayer Fees**: Included in bridge fee

### Bridge Limits

- **Minimum**: 1 token (or equivalent)
- **Maximum**: Based on liquidity
- **Daily Limit**: Configurable per token

## Testing

### Test Scenarios

1. **Basic Bridge**:
   - Bridge tokens from ChainID 138 to Ethereum
   - Bridge tokens from Ethereum to ChainID 138
   - Verify balances on both chains

2. **Edge Cases**:
   - Bridge minimum amount
   - Bridge maximum amount
   - Bridge during high congestion
   - Bridge with failed transactions

3. **Security**:
   - Test invalid messages
   - Test replay attacks
   - Test double-spend prevention
   - Test validator rotation

## Monitoring

### Metrics to Monitor

- Bridge transaction volume
- Bridge success rate
- Bridge fees collected
- Bridge latency
- Liquidity levels
- Security events

### Alerts

- Failed bridge transactions
- Low liquidity warnings
- Security incidents
- High latency alerts

## Documentation

### User Documentation

- How to bridge tokens
- Bridge fees and limits
- Bridge time estimates
- Troubleshooting guide

### Developer Documentation

- Bridge API documentation
- Integration examples
- SDK documentation
- Contract addresses

## Support

### User Support

- Bridge transaction issues
- Bridge fee questions
- Bridge time questions
- Troubleshooting

### Developer Support

- Integration help
- API questions
- Contract questions
- Testing support

---

**Last Updated**: 2026-01-26
