If you want to use the heartbeat monitor from Uptime Robot with C# in a project, you can use this sample code to get started. Make sure to update the URL with the correct URL. GitHub Gist

var client = new HttpClient();

// Heartbeat URL
const string url = "https://heartbeat.uptimerobot.com/YOUR CODE HERE";

// Get the response.
HttpResponseMessage response = await client.GetAsync(url);

Console.WriteLine(response.StatusCode);

// Get the response content.
_ = response.Content;