From Zero to Web3: Create Your First Smart Contract Today (1777809749)

Why This Matters

The blockchain space is growing fast, and developers who understand cross-chain tools have a massive advantage. This guide will get you from zero to a working DeFi monitoring tool in under 30 minutes.

What You'll Build

• A real-time price monitor for ETH, BSC, and Polygon
• Automatic alerts for large transactions (> $100K)
• A simple dashboard to visualize cross-chain activity
• Exportable logs for further analysis

Prerequisites

• Python 3.8+
• Basic understanding of APIs
• A text editor

Step 1: Setup

pip install web3 requests pandas

Step 2: Connect to Chains

from web3 import Web3

chains = {
    "ethereum": Web3(Web3.HTTPProvider("https://eth.llamarpc.com")),
    "bsc": Web3(Web3.HTTPProvider("https://bsc-dataseed.binance.org")),
    "polygon": Web3(Web3.HTTPProvider("https://polygon-rpc.com")),
}

for name, w3 in chains.items():
    print(f"{name}: block {w3.eth.block_number}")

Step 3: Monitor Transactions

def monitor_large_tx(w3, chain_name, threshold=100000):
    latest = w3.eth.get_block('latest', full_transactions=True)
    for tx in latest.transactions:
        value_eth = w3.from_wei(tx['value'], 'ether')
        if float(value_eth) > threshold:
            print(f"[{chain_name}] Large TX: {value_eth:.2f} ETH")
            print(f"  From: {tx['from']}")
            print(f"  To: {tx['to']}")

Next Steps

Clone the full code from our GitHub. The complete project with dashboard UI is available for \$15 USDT.

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