Yes, that server was taken down some months ago. The easiest way to get access to the SDK API calls is to run your own instance of rhino.compute and hit the sdk endpoint. The most straightforward way to do this in Rhino 7 is to install the Hops plugin (via the package manager). Once installed, each time you start Grasshopper, a local instance of rhino.compute will get spun up automatically and will listen for requests on http://localhost:6500. So, to get the list of API calls, you simply need to then go to a browser window and enter the URL: http://localhost:6500/sdk. Let me know if you have any follow up questions.
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