using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using System.Net.Http;

using System.Net.Http.Headers;

using Newtonsoft.Json;

public class Program

{

    public static async Task Main()

    {

        var apiClient = new HttpClient();

        apiClient.DefaultRequestHeaders.Accept.Clear();

        apiClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        Uri url = new Uri("https://api.exchangeratesapi.io/latest?base=AUD");

        using (var response = await apiClient.GetAsync(url))

        {

            response.EnsureSuccessStatusCode();

            string responseBody = await response.Content.ReadAsStringAsync();

            var data = JsonConvert.DeserializeObject<RatesModel>(responseBody);

            Console.WriteLine(data.Rates["GBP"]);

        }

    }

}

​

public partial class RatesModel

{

    [JsonProperty("rates")]

    public Dictionary<string, double> Rates { get; set; }

​

    [JsonProperty("base")]

    public string Base { get; set; }

​

    [JsonProperty("date")]

    public DateTimeOffset Date { get; set; }

}