Can you use Echelon for free?

Could you elaborate on the feasibility of utilizing Echelon at no cost? Is there a free tier or trial period offered? Are there any limitations or restrictions imposed on free users? Understanding the full scope of the free offering, if any, would greatly assist in determining if Echelon is suitable for my needs without incurring financial obligations. Clarifying these points upfront is crucial in making an informed decision about whether to explore Echelon further.