Проблема с объектом Json и C#

У меня такой JSON:

{
"BTC_BCN": {
    "id": 7,
    "last": "0.00000019",
    "lowestAsk": "0.00000020",
    "highestBid": "0.00000019",
    "percentChange": "0.00000000",
    "baseVolume": "7.27124323",
    "quoteVolume": "36958572.58593949",
    "isFrozen": "0",
    "high24hr": "0.00000020",
    "low24hr": "0.00000019"
},
"BTC_BTS": {
    "id": 14,
    "last": "0.00001512",
    "lowestAsk": "0.00001518",
    "highestBid": "0.00001512",
    "percentChange": "0.00000000",
    "baseVolume": "3.82925362",
    "quoteVolume": "253971.93868064",
    "isFrozen": "0",
    "high24hr": "0.00001525",
    "low24hr": "0.00001495"
   }
 }

... Еще много записей.

Это моя модель:

public class GetInfoCoinsPoloniex
{

    public int id { get; set; }
    public string last { get; set; }
    public string lowestAsk { get; set; }
    public string highestBid { get; set; }
    public string percentChange { get; set; }
    public string baseVolume { get; set; }
    public string quoteVolume { get; set; }
    public string isFrozen { get; set; }
    public string high24hr { get; set; }
    public string low24hr { get; set; }
}

public class RootPoloniex
{
    public GetInfoCoinsPoloniex symbol { get; set; }        
}

И это мой Контроллер:

[Route("api/poloniex")]
[ApiController]
public class PoloniexController : ControllerBase
{
    [HttpGet]
    public async Task<IEnumerable<GetInfoCoinsPoloniex>> GetCoinsPoloniex()
    {
        string Baseurl = "https://poloniex.com";
        string Parameters = "public?command=returnTicker";
        List<GetInfoCoinsPoloniex> CoinsInfoPoloniex = new List<GetInfoCoinsPoloniex>();            

        using (var client = new HttpClient())
        {
            //Passing service base url  
            client.BaseAddress = new Uri(Baseurl);

            client.DefaultRequestHeaders.Clear();
            //Define request data format  
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            //Sending request to find web api REST service resource GetAllEmployees using HttpClient  
            HttpResponseMessage Res = await client.GetAsync(Parameters);

            //Checking the response is successful or not which is sent using HttpClient  
            if (Res.IsSuccessStatusCode)
            {
                //Storing the response details recieved from web api   
            string CoinResponse = Res.Content.ReadAsStringAsync().Result;
            CoinsInfoPoloniex = JsonConvert.DeserializeObject<List<GetInfoCoinsPoloniex>>(CoinResponse);

            }

            return CoinsInfoPoloniex;

        }
    }
}

И я получаю эту ошибку:

JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

Я думаю, моя проблема в том, что я неправильно обрабатываю структуру JSON. Somebady, помогите мне, пожалуйста ?. Большое спасибо.