telegram-bot/modules/CombotAntiSpam/Combot/CombotClient.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Kruzya.TelegramBot.Core.Extensions;
using Telegram.Bot.Types;

namespace Kruzya.TelegramBot.CombotAntiSpam.Combot
{
    public class CombotClient : ICombotClient
    {
        public HttpClient _HttpClient;

        public CombotClient()
        {
            _HttpClient = new HttpClient();
            _HttpClient.BaseAddress = new Uri("https://api.cas.chat/check");
        }
        
        public bool IsSpammer(User user)
        {
            return IsSpammerAsync(user).GetAwaiter().GetResult();
        }

        public async Task<bool> IsSpammerAsync(User user)
        {
            var result = await _HttpClient.GetJsonAsync<CombotApiResponse>($"?user_id={user.Id}");
            return result.IsSpammer;
        }
    }
}