Track Ethereum Transactions and Balance Using Python

Ethereum transaction tracking and balance monitoring are essential for developers and crypto enthusiasts. This guide demonstrates how to use Python with the Etherscan API to fetch wallet balances, analyze transactions, and visualize data over time.

Prerequisites

• Intermediate Python knowledge
• Installed libraries: requests, pandas, matplotlib
• Free Etherscan API key (sign up here)

Step 1: Setting Up the Etherscan API

Obtain an API Key

1. Register on Etherscan.
2. Generate a free API key under "API Keys" in your account dashboard.

Configure Python Environment

pip install requests pandas matplotlib

Step 2: Fetching Ethereum Wallet Balance

Code Example

import requests  

api_key = "YOUR_API_KEY"  
address = "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"  # Example address  

url = f"https://api.etherscan.io/api?module=account&action=balance&address={address}&tag=latest&apikey={api_key}"  
response = requests.get(url)  
balance_wei = int(response.json()["result"])  
balance_eth = balance_wei / 10**18  # Convert wei to ETH  
print(f"Balance: {balance_eth:.6f} ETH")  

Key Parameters

• module=account: Specifies wallet-related queries.
• action=balance: Retrieves the current balance.
• tag=latest: Fetches the most recent data.

Step 3: Tracking Transactions

Fetch Transaction History

tx_url = f"https://api.etherscan.io/api?module=account&action=txlist&address={address}&startblock=0&endblock=99999999&sort=asc&apikey={api_key}"  
tx_response = requests.get(tx_url)  
transactions = tx_response.json()["result"]  

Analyze Transaction Data

• Fields: blockNumber, timeStamp, value, gasUsed, hash.

• Use pandas to structure data:

  import pandas as pd  
  df = pd.DataFrame(transactions)  
  df['value_eth'] = df['value'].astype(float) / 10**18  

Step 4: Visualizing Wallet Activity

Plot Balance Over Time

import matplotlib.pyplot as plt  

df['date'] = pd.to_datetime(df['timeStamp'], unit='s')  
df.plot(x='date', y='value_eth', kind='line')  
plt.title("Ethereum Wallet Balance Timeline")  
plt.ylabel("Balance (ETH)")  
plt.show()  

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FAQ

How often does the Etherscan API update?

Data refreshes every 1–2 minutes, depending on Ethereum network activity.

Is there a rate limit for the free API?

Yes: 5 calls/sec and 100,000 calls/day. Upgrade to a paid plan for higher limits.

Can I track ERC-20 token balances?

Yes. Use action=tokentx instead of txlist in the API request.

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Key Takeaways

• Core Keywords: Ethereum, Python, Etherscan API, transaction tracking, wallet balance, data visualization.
• SEO Tip: Integrate keywords naturally (e.g., "monitor Ethereum transactions programmatically").
• Always secure your API keys and avoid exposing them in public repositories.

By following this guide, you can build a robust Ethereum tracker tailored to your needs. For more complex analytics, consider leveraging blockchain SDKs like Web3.py.