using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"{

         ""rates"":

            {

            ""btc"": {""name"":""Bitcoin"",""unit"":""BTC"",""value"":1.0,""type"":""crypto""},

            ""eth"": {""name"":""Ether"",""unit"":""ETH"",""value"":12.954,""type"":""crypto""}

            }

        }";

        var model = JsonConvert.DeserializeObject<MyData>(json);

        model.Dump();

        foreach (var key in model.Rates.Keys)

            Console.WriteLine($"Name:{model.Rates[key].Name}, Unit:{model.Rates[key].Unit}, Value:{model.Rates[key].Value}");

    }

}

​

public class MyData

{

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

}

​

public class CryptoData

{

    public string Name { get;set;}

    public string Unit { get;set;}

    public string Value { get;set;}

    public string Type { get;set;}

}