using System;

using Newtonsoft.Json;

using System.Collections.Generic;

​

public class Root

{

    public Result[] results { get; set; }

}

​

public class Result

{

    public SellOffers sell_offers { get; set; }

}

​

public class SellOffers

{

    public List<List<int>> offers { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var text = "{\"success\":true,\"results\":[{\"classid\":\"1812818783\",\"instanceid\":\"188530139\",\"sell_offers\":{\"best_offer\":324,\"offers\":[[324,1],[444,2],[446,1],[524,1],[528,2],[540,1],[543,1],[554,1],[1498,2],[1500,1]],\"my_offers\":null},\"buy_offers\":null,\"history\":null,\"info\":{\"our_market_instanceid\":null,\"market_name\":\"xxx\",\"name\":\"xxx\",\"market_hash_name\":\"xxx\",\"rarity\":\"xxx\",\"quality\":\"xxx\",\"type\":\"xxx\",\"mtype\":\"xxx\",\"slot\":\"xxx\"}}]}";

        var json = JsonConvert.DeserializeObject<Root>(text);

        foreach (var item in json.results[0].sell_offers.offers)

        {

            Console.WriteLine(item[0] + " " + item[1] );

        }

    }

}