diff --git a/AssetManager.Infrastructure/Services/MarketDataService.cs b/AssetManager.Infrastructure/Services/MarketDataService.cs
index afa7af3..341dbb1 100644
--- a/AssetManager.Infrastructure/Services/MarketDataService.cs
+++ b/AssetManager.Infrastructure/Services/MarketDataService.cs
@@ -170,10 +170,9 @@ public class MarketDataService : IMarketDataService
 
             var endDate = DateTime.UtcNow;
             var startDate = CalculateStartDate(endDate, timeframe, limit);
-            var resampleFreq = GetTiingoResampleFreq(timeframe);
 
-            // Tiingo 加密货币历史数据端点
-            var url = $"https://api.tiingo.com/tiingo/crypto/prices?tickers={symbol}&startDate={startDate:yyyy-MM-dd}&endDate={endDate:yyyy-MM-dd}&resampleFreq={resampleFreq}&token={_tiingoApiKey}";
+            // Tiingo 加密货币历史数据端点（不带 resampleFreq）
+            var url = $"https://api.tiingo.com/tiingo/crypto/prices?tickers={symbol}&startDate={startDate:yyyy-MM-dd}&endDate={endDate:yyyy-MM-dd}&token={_tiingoApiKey}";
             var response = await _httpClient.GetFromJsonAsync<List<TiingoCryptoPriceResponse>>(url);
 
             if (response == null || response.Count == 0 || response[0].priceData == null)