How much is Echelon per month?

Could you please elaborate on the cost structure of Echelon? Specifically, I'm interested in understanding the monthly fee associated with this service. I'm seeking clarity on whether there are any additional costs or hidden fees that I should be aware of. Additionally, I'd like to know if there are any discounts or promotional offers available for new users. Understanding the full cost picture is crucial for me to make an informed decision about whether Echelon is a suitable option for my financial needs. Thank you for your assistance in clarifying this matter.