def get_historical_prices(self, symbol, start_date, end_date):
    url = f"{self.base_url}ohlcv/{symbol}/USD/history?period_id=1DAY&time_start={start_date}&time_end={end_date}"
    headers = {'X-CoinAPI-Key': self.api_key}

    response = requests.get(url, headers=headers)
    data = response.json()

    return data