We are currently using Open Elevation but that project seems dead. We are interested in yours for our Line-of-Sight charts on our Amateur Repeater Directory https://amateurrepeaterdirectory.org/ site. We are interested to know what the rate limit might be, we are willing to help sponsor but all of our users will be obviously coming from the same IP, our Amateur Repeater Directory site and we want to make sure it will work? Our site is free and open source.

We are pretty much ready to move quickly, our charts look like this (Fresnel Ham Radio stuff). Hoping to hear back, thanks !!