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With the web3.py library, this script connects to the Polygon blockchain via a Chainstack RPC node running BOR. It’s designed to fetch transaction logs from a particular block, specifically targeting logs related to a predefined Ethereum address. Leveraging the eth_getTransactionReceiptsByBlock method, exclusive to the BOR node, this code provides a streamlined way to extract and display transaction details, making it a handy tool for developers and analysts monitoring specific addresses on the Polygon network.
Create a new directory for your project, then install the web3.py library:pip install web3
You will need a Chainstack account and a Polygon full node to run this code.
  1. Sign up with Chainstack.
  2. Deploy a node.
  3. View node access and credentials.
The script connects to the Polygon network using the web3.py library and targets a specific block. It fetches transaction receipts from this block and sifts through them to identify transactions related to a predefined Ethereum address. Relevant details from these transactions, including logs, are then extracted and displayed, providing a snapshot of the address’s activities within that block. Error handling mechanisms ensure smooth operation and user feedback in case of issues.
In your directory, create a new file named main.py.
The script starts by importing necessary modules and defining constants.
main.py
from pprint import pprint
from web3 import Web3

NODE_URL = "YOUR_CHAINSTACK_POLYGON_RPC" # This needs to be running on BOR and the eth_getTransactionReceiptsByBlock method is only available there
ADDRESS = '0x371ef444a12b951b492f19ed6343a8aac6fdca55' # Edit with the address you need to monitor
These functions handle conversions between decimal and hexadecimal formats.
main.py
def decimal_to_hex(decimal_number):
    """Convert a decimal number to its hexadecimal representation."""
    return hex(decimal_number)

def hex_to_decimal(hex_string):
    """Convert a hexadecimal string to its decimal representation."""
    return int(hex_string, 16)
This function sifts through block receipts to find and print logs related to the specified Ethereum address.
main.py
def get_logs_for_address(address, block_receipts):
    """
    Fetch and print logs for a given Ethereum address from the provided block receipts.
    """
    receipts = block_receipts.get('result', [])
    for receipt in receipts:
        if receipt['to'] == address:
            print('Block number:' , hex_to_decimal(receipt['blockNumber']))
            print('Transaction hash:', receipt['transactionHash'])
            print('To:' , receipt['to'], '\n')
            print('Logs:')
            pprint(receipt['logs'])
The main function serves as the primary driver of the script.It establishes a connection to the Polygon node, fetches transaction receipts for a specific block, and then invokes the log extraction function.
main.py
def main():
    web3 = Web3.HTTPProvider(NODE_URL)

    block = 45941582
    hex_block = decimal_to_hex(block)

    try:
        block_receipts = web3.make_request('eth_getTransactionReceiptsByBlock', [hex_block])
        get_logs_for_address(ADDRESS, block_receipts)
    except Exception as e:
        print(f"An error occurred: {e}")
This conditional ensures that the main function is executed only when the script is run directly and not when imported as a module.
main.py
if __name__ == "__main__":
    main()
Now add your Chainstack node URL and run the script:
python3 main.py
The script will print logs for any transaction going to the specified address.
from pprint import pprint
from web3 import Web3

NODE_URL = "YOUR_CHAINSTACK_POLYGON_RPC" # This needs to be running on BOR and the eth_getTransactionReceiptsByBlock method is only available there
ADDRESS = '0x371ef444a12b951b492f19ed6343a8aac6fdca55' # Edit with the address you need to monitor

def decimal_to_hex(decimal_number):
    """Convert a decimal number to its hexadecimal representation."""
    return hex(decimal_number)

def hex_to_decimal(hex_string):
    """Convert a hexadecimal string to its decimal representation."""
    return int(hex_string, 16)

def get_logs_for_address(address, block_receipts):
    """
    Fetch and print logs for a given Ethereum address from the provided block receipts.
    """
    receipts = block_receipts.get('result', [])
    for receipt in receipts:
        if receipt['to'] == address:
            print('Block number:' , hex_to_decimal(receipt['blockNumber']))
            print('Transaction hash:', receipt['transactionHash'])
            print('To:' , receipt['to'], '\n')
            print('Logs:')
            pprint(receipt['logs'])

def main():
    web3 = Web3.HTTPProvider(NODE_URL)

    block = 45941582
    hex_block = decimal_to_hex(block)

    try:
        block_receipts = web3.make_request('eth_getTransactionReceiptsByBlock', [hex_block])
        get_logs_for_address(ADDRESS, block_receipts)
    except Exception as e:
        print(f"An error occurred: {e}")

if __name__ == "__main__":
    main()

{"success":true}
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