Building a Real-Time Ethereum Gas Tracker in Python with Web3.py

#crypto #python #opensource #web3

Why Monitor Gas Prices?

Gas prices on Ethereum fluctuate wildly. Whether you are deploying contracts or swapping tokens, timing matters. In this guide, we build a lightweight real-time gas tracker using Python and Web3.py.

The Stack

Python 3.10+ — async support and type hints
Web3.py — the leading Ethereum library for Python
Infura / Alchemy — free RPC endpoints
Rich — beautiful terminal tables

Core Implementation

from web3 import Web3
import asyncio

INFURA_URL = "https://mainnet.infura.io/v3/YOUR_KEY"
w3 = Web3(Web3.HTTPProvider(INFURA_URL))

async def fetch_gas():
    base_fee = w3.eth.fee_history(1, "latest")["baseFeePerGas"][-1]
    priority = w3.eth.max_priority_fee
    return {
        "low": base_fee + priority,
        "avg": base_fee + priority * 2,
        "high": base_fee + priority * 3
    }

What You Will Learn

Connecting to Ethereum nodes via HTTP
Reading on-chain fee data in real time
Formatting output with the Rich library
Setting up a continuous polling loop

Full source code and more examples available at github.com/Byaigo.

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