public CoinMarketCapClient(HttpClient httpClient, IServiceConfig config, ILogger <CoinMarketCapClient> logger)
        {
            _logger     = logger;
            _httpClient = httpClient;
            _config     = config;

            _baseApiUrl = _config.GetCoinMarketCapApiUrl();

            _httpClient.DefaultRequestHeaders.Clear();
            _httpClient.DefaultRequestHeaders.Add("X-CMC_PRO_API_KEY", _config.GetCoinMarketCapApiKey());
        }