Hi there,
I tried the contact us through your (very cool) site. However I get an error code -1 alert when trying to send the message.
Anyway, my main point is to let you know I'm the developer of the elevation api you are using. Wanted to let you know that is has become a financial burden trying to keep it free and was forced to convert it to a 'freemium' based approach.
The api will remain the same, however, only 1km resolution will be given. The 90 and 30 meter resolutions are available for quite a small added price. If you're good w/ 1km then no action is needed. 👍