Skip to main content

Use Python

Send a regular transaction from one account to another with Python.

Prerequisites​

info

Use MetaMask or similar to create an Ethereum account for testing.

Steps​

1. Create a project directory​

Create a new directory:

mkdir infura

cd into the directory:

cd infura

2. install the dependencies​

pip install web3
pip install python-dotenv

3. Create .env file​

Create a .env file in your project directory to store the private key of your Ethereum account.

PRIVATE_KEY = <PRIVATE-KEY>

Find out how to access the private key of your Ethereum account. Make sure that you prefix the <PRIVATE_KEY> value with 0x. The private key you export from MetaMask will not be prefixed with 0x.

danger

Never disclose your private key.

A malicious actor who has access to your private key can steal your assets.

4. Create eip1559_tx.py file​

Create a file named eip1559_tx.py and add the following lines of code.

import os  
from dotenv import load_dotenv  
from web3 import Web3, exceptions  
  
load_dotenv()  
  
infura_url = 'https://sepolia.infura.io/v3/<API-KEY>'  
private_key = os.getenv('PRIVATE_KEY')  
from_account = '<PUBLIC-KEY>'  
to_account = '<RECIPIENT-PUBLIC-KEY>'  
web3 = Web3(Web3.HTTPProvider(infura_url))  
  
try:  
    from_account = web3.to_checksum_address(from_account)  
except exceptions.InvalidAddress:  
    print(f"Invalid 'from_account' address: {from_account}")  
  
try:  
    to_account = web3.to_checksum_address(to_account)  
except exceptions.InvalidAddress:  
    print(f"Invalid 'to_account' address: {to_account}")  
  
nonce = web3.eth.get_transaction_count(from_account)  
tx = {
    'type': '0x2',
    'nonce': nonce,
    'from': from_account,
    'to': to_account,
    'value': web3.to_wei(0.01, 'ether'),
    'maxFeePerGas': web3.to_wei('250', 'gwei'),
    'maxPriorityFeePerGas': web3.to_wei('3', 'gwei'),
    'chainId': 11155111
}
gas = web3.eth.estimate_gas(tx)
tx['gas'] = gas
signed_tx = web3.eth.account.sign_transaction(tx, private_key)
tx_hash = web3.eth.send_raw_transaction(signed_tx.rawTransaction)
print("Transaction hash: " + str(web3.to_hex(tx_hash)))

Ensure you replace the following values in the code:

  • <API-KEY> with the API key of the Web3 project.
  • <PUBLIC-KEY> with the public key associated with the private key you added in the .env file.
  • <RECIPIENT-PUBLIC-KEY> With the public key of the recipient of the transfer.

If using a different Ethereum network, update the URL in the code.

4. Execute the transaction​

Run the script:

python eip1559_tx.py

Example output:

Transaction hash: 0x30c0ef29111ca7aecc78a99149649b5076d104afa7ed2f603ff2d2ec1aa27a8c

You can search for the transaction on a block explorer like Sepolia Etherscan

Last updated on