How to use the Macrostrat API in C#

using System.Net.Http;

using var http = new HttpClient { Timeout = TimeSpan.FromSeconds(10) };
var json = await http.GetStringAsync("https://macrostrat.org/api");
Console.WriteLine(json);

{
  "success": {
    "v": 2,
    "description": "This is the root of the Macrostrat API",
    "changelog": "/changes",
    "license": "CC-BY 4.0. More info at /meta",
    "routes": {
      "/columns": "Search and summarize columns based on unit properties or geographic location",
      "/sections": "Summarize units by gap-bound packages",
      "/units": "all Macrostrat units matching search criteria",
      "/fossils": "Paleobiology Database (http://paleobiodb.org) collections matched to Macrostr...",
      "/stats": "statistics about the Macrostrat database",
      "/paleogeography": "Returns paleogeography geometry from \"Wright et al. (2013) Towards community-...",
      "/geologic_units/map": "Geologic map units from various data sources",
      "/geologic_units/map/points": "Query point features from geologic maps",
      "/geologic_units/map/legend": "Retrieve legends for geologic map units",
      "/measurements": "measurements",
      "/age_model": "Get all components of column age models; mostly unit_boundaries but can inclu...",
      "/eodp": "eODP Macrostrat Baggage Stripper Import"
    }
  }
}