mev-beta/scripts/check-wallet-balance.sh

#!/usr/bin/env bash
# Check wallet balance on Arbitrum One
# Verifies wallet is ready for MEV bot execution

set -euo pipefail

PRIVATE_KEY_FILE="/tmp/wallet_key.txt"
ALCHEMY_RPC="https://arb-mainnet.g.alchemy.com/v2/d6VAHgzkOI3NgLGem6uBMiADT1E9rROB"
MIN_BALANCE_ETH="0.001"

echo "═══════════════════════════════════════════════════════════"
echo "💰 MEV Bot Wallet Balance Check"
echo "═══════════════════════════════════════════════════════════"
echo ""

# Check if private key file exists
if [ ! -f "$PRIVATE_KEY_FILE" ]; then
    echo "❌ Error: Private key file not found at $PRIVATE_KEY_FILE"
    exit 1
fi

PRIVATE_KEY=$(cat "$PRIVATE_KEY_FILE")

# Derive wallet address
echo "🔍 Deriving wallet address..."

if command -v cast &> /dev/null; then
    WALLET_ADDRESS=$(cast wallet address "$PRIVATE_KEY")
elif command -v python3 &> /dev/null; then
    WALLET_ADDRESS=$(python3 << 'EOF'
try:
    from eth_account import Account
    import sys

    with open('/tmp/wallet_key.txt', 'r') as f:
        private_key = f.read().strip()

    if private_key.startswith('0x'):
        private_key = private_key[2:]

    account = Account.from_key(bytes.fromhex(private_key))
    print(account.address)
except Exception as e:
    print(f"Error: {e}", file=sys.stderr)
    sys.exit(1)
EOF
)
else
    echo "❌ Error: Neither cast nor python3 available"
    echo "   Please install Foundry or Python with eth_account"
    exit 1
fi

echo "✅ Wallet Address: $WALLET_ADDRESS"
echo ""

# Query balance from Arbitrum
echo "🌐 Querying Arbitrum One network..."

BALANCE_HEX=$(curl -s -X POST "$ALCHEMY_RPC" \
    -H "Content-Type: application/json" \
    -d "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getBalance\",\"params\":[\"$WALLET_ADDRESS\",\"latest\"],\"id\":1}" | \
    grep -o '"result":"[^"]*"' | \
    cut -d'"' -f4)

if [ -z "$BALANCE_HEX" ]; then
    echo "❌ Error: Failed to query balance from Arbitrum"
    echo "   RPC endpoint may be unavailable"
    exit 1
fi

# Convert hex to decimal (wei)
# Handle both with and without 0x prefix
if [[ "$BALANCE_HEX" == 0x* ]]; then
    BALANCE_WEI=$((BALANCE_HEX))
else
    BALANCE_WEI=$((0x$BALANCE_HEX))
fi

# Convert wei to ETH (1 ETH = 10^18 wei)
BALANCE_ETH=$(echo "scale=6; $BALANCE_WEI / 1000000000000000000" | bc)

echo "✅ Balance Retrieved"
echo ""

# Display balance
echo "═══════════════════════════════════════════════════════════"
echo "💰 Current Balance"
echo "═══════════════════════════════════════════════════════════"
echo ""
echo "  Address: $WALLET_ADDRESS"
echo "  Network: Arbitrum One (Chain ID: 42161)"
echo "  Balance: $BALANCE_ETH ETH"
echo "  Value:   ~\$$(echo "scale=2; $BALANCE_ETH * 2000" | bc) USD (at \$2000/ETH)"
echo ""

# Check if balance meets minimum
BALANCE_CHECK=$(echo "$BALANCE_ETH >= $MIN_BALANCE_ETH" | bc)

if [ "$BALANCE_CHECK" -eq 1 ]; then
    echo "✅ Wallet is funded and ready for execution!"
    echo ""

    # Calculate estimated trades
    TRADES=$(echo "scale=0; $BALANCE_ETH / 0.0005" | bc)
    echo "📊 Estimated Capacity:"
    echo "  • Max gas per trade: ~\$1.00 (~0.0005 ETH)"
    echo "  • Estimated trades: ~$TRADES transactions"
    echo "  • Recommended refill: When balance < 0.0005 ETH"
    echo ""

    echo "⏭️  Next Steps:"
    echo "  1. Run: ./scripts/setup-keystore.sh"
    echo "  2. Enable execution mode in config"
    echo "  3. Restart bot to begin trading"
    echo ""

    # Arbiscan link
    echo "🔗 View on Arbiscan:"
    echo "   https://arbiscan.io/address/$WALLET_ADDRESS"
    echo ""

    exit 0
else
    echo "⚠️  Wallet balance is below minimum threshold"
    echo ""
    echo "❌ Current:  $BALANCE_ETH ETH"
    echo "✅ Required: $MIN_BALANCE_ETH ETH"
    echo "📉 Deficit:  $(echo "scale=6; $MIN_BALANCE_ETH - $BALANCE_ETH" | bc) ETH"
    echo ""
    echo "💡 Funding Instructions:"
    echo ""
    echo "  **Option 1: Bridge from Ethereum**"
    echo "    • Visit: https://bridge.arbitrum.io/"
    echo "    • Bridge 0.001-0.005 ETH from Ethereum to Arbitrum"
    echo "    • Wait 7-15 minutes for confirmation"
    echo ""
    echo "  **Option 2: Exchange Withdrawal**"
    echo "    • Go to Coinbase/Binance/Kraken"
    echo "    • Withdraw → ETH → Select 'Arbitrum One' network"
    echo "    • Send to: $WALLET_ADDRESS"
    echo "    • Amount: 0.001-0.005 ETH"
    echo ""
    echo "  **Option 3: From Existing Arbitrum Wallet**"
    echo "    • Open MetaMask on Arbitrum One network"
    echo "    • Send 0.001-0.005 ETH to: $WALLET_ADDRESS"
    echo ""
    echo "🔗 Track transaction:"
    echo "   https://arbiscan.io/address/$WALLET_ADDRESS"
    echo ""

    exit 1
fi