Snippet for creating a gas price in USDC feed

gas_price_feed.py

ORACLE_ABI = """[{"inputs":[{"internalType":"address","name":"_aggregator","type":"address"},{"internalType":"address","name":"_accessController","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"int256","name":"current","type":"int256"},{"indexed":true,"internalType":"uint256","name":"roundId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"updatedAt","type":"uint256"}],"name":"AnswerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"roundId","type":"uint256"},{"indexed":true,"internalType":"address","name":"startedBy","type":"address"},{"indexed":false,"internalType":"uint256","name":"startedAt","type":"uint256"}],"name":"NewRound","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"OwnershipTransferRequested","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"accessController","outputs":[{"internalType":"contract AccessControllerInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"aggregator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_aggregator","type":"address"}],"name":"confirmAggregator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_roundId","type":"uint256"}],"name":"getAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_roundId","type":"uint256"}],"name":"getTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"","type":"uint16"}],"name":"phaseAggregators","outputs":[{"internalType":"contract AggregatorV2V3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"phaseId","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_aggregator","type":"address"}],"name":"proposeAggregator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"proposedAggregator","outputs":[{"internalType":"contract AggregatorV2V3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"proposedGetRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proposedLatestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_accessController","type":"address"}],"name":"setController","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]"""


import collections
import json
from statistics import median

from web3 import Web3

BlockData = collections.namedtuple(
    "BlockData", ["number", "timestamp", "median_gas_price"]
)

w3 = Web3(Web3.HTTPProvider("<NODE_URL>"))

oracle_address = "0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419"


def fetch_eth_price():
	oracle_contract = w3.eth.contract(address=oracle_address, abi=json.loads(ORACLE_ABI))
	return oracle_contract.functions.latestAnswer().call() / 10 ** 8

def fetch_block_data(sample_size):
    latest = w3.eth.get_block("latest", full_transactions=True)

    yield BlockData(
    	latest.number,
    	latest.timestamp, 
    	statistics.median([tx.gasPrice for tx in latest.transactions])
    )

    block = latest

    for _ in range(sample_size - 1):
        block = w3.eth.get_block(block.parentHash, full_transactions=True)
        yield BlockData(
        	block.number,
        	block.timestamp, 
        	statistics.median([tx.gasPrice for tx in block.transactions])
        )
        

def calculate_weighted_average_gas_price(sample_size):
	block_data = list(fetch_block_data(sample_size))
	sorted_block_data = sorted(block_data, key=lambda x: x.timestamp)
	oldest_block_number = sorted_block_data[0].number
	prev_timestamp = w3.eth.get_block(oldest_block_number - 1).timestamp
	weighted_sum = 0.0
	sum_of_weights = 0.0
	for block in sorted_block_data:
		weight = block.timestamp - prev_timestamp
		weighted_sum += weight * block.median_gas_price
		sum_of_weights += weight
		prev_timestamp = block.timestamp
	return weighted_sum / sum_of_weights


def calculate_gas_price_in_usd():
	gas_price = calculate_weighted_average_gas_price(5) #  5 blocks
	eth_price = fetch_eth_price()
	return (gas_price / 10 ** 18) * eth_price

print(calculate_gas_price_in_usd())