using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var json = "{\"success\":true,\"lowest_price\":\"$2.87\",\"volume\":\"557\",\"median_price\":\"$2.87\"}";

        var result = JsonConvert.DeserializeObject<Result>(json);

        result.Dump();      

    }

}

​

public class Result

{

    public bool Success { get; set; }

    [JsonProperty("lowest_price")]

    public string LowestPrice { get; set; }

    public int Volume { get; set; }

    [JsonProperty("median_price")]

    public string MedianPrice { get; set; }

}