githubapi.cs

var keywords = new[] { "GET", "DELETE", "PATCH", "POST" };

var document =new HtmlDocument();
	document .LoadHtml(
	(new HtmlWeb()
	.Load("https://developer.github.com/v3/")
	.DocumentNode.SelectSingleNode("/html[1]/body[1]/div[3]/div[2]/div[1]").ChildNodes
	.Select(cn => cn.InnerHtml)
	.Where(cn => !string.IsNullOrEmpty(cn.Trim()))
	.First()));

var dictionary  = document.DocumentNode.SelectNodes("//a")
				  .Select(p => new
				  {
					  Key = p.GetAttributeValue("href", "not found").Replace("/v3", ""),
					  Value = "https://developer.github.com" +  p.GetAttributeValue("href", "not found")
				  })
				  .Where(p => p.Key.Trim() != "#" & p.Key.Trim() != "/")
			  .ToDictionary(p => p.Key, p => p.Value)
			  .OrderBy(p => p.Key);

var newapis = new Func<string, IEnumerable<string>>((url) =>
{
	
	try
	{
	return new HtmlWeb()
	.Load(url)
	.DocumentNode.SelectSingleNode("//*[@id=\"wrapper\"]/div[1]").SelectNodes("//pre")
	.Select(dn => dn.InnerText)
	.Where(cn => keywords
			.Contains(
			Regex.Split(cn, "[^a-zA-Z]+").First() /*split first  word*/)).ToList();
	}
	catch (Exception ex)
	{
		return new[] {""};
	}
	
});

//these things don't have any API's - troubleshooting, versions,/activity/events/types/, auth
dictionary.ToObservable()
.Select(d => new {Key = d.Key, Values = newapis(d.Value) })
.Dump();