diff --git a/AssetManager.Infrastructure/Services/MarketDataService.cs b/AssetManager.Infrastructure/Services/MarketDataService.cs
index d46ae06..497e4b3 100644
--- a/AssetManager.Infrastructure/Services/MarketDataService.cs
+++ b/AssetManager.Infrastructure/Services/MarketDataService.cs
@@ -23,7 +23,7 @@ public class MarketDataService : IMarketDataService
         _logger = logger;
         _httpClient = httpClientFactory.CreateClient();
         // TODO: 从配置读取 Tiingo API Key
-        _tiingoApiKey = Environment.GetEnvironmentVariable("TIINGO_API_KEY") ?? "YOUR_TIINGO_API_KEY";
+        _tiingoApiKey = Environment.GetEnvironmentVariable("TIINGO_API_KEY") ?? "bd00fee76d3012b047473078904001b33322cb46";
         _httpClient.DefaultRequestHeaders.Add("Authorization", $"Token {_tiingoApiKey}");
     }
 
@@ -38,21 +38,23 @@ public class MarketDataService : IMarketDataService
         {
             _logger.LogInformation($"Requesting stock price for symbol: {symbol}");
 
-            // Tiingo 最新价格端点
-            var url = $"https://api.tiingo.com/iex/{symbol}?token={_tiingoApiKey}";
-            var response = await _httpClient.GetFromJsonAsync<List<TiingoPriceResponse>>(url);
+            // Tiingo 日线最新价格端点（取最近1条）
+            var url = $"https://api.tiingo.com/tiingo/daily/{symbol}/prices?token={_tiingoApiKey}";
+            var response = await _httpClient.GetFromJsonAsync<List<TiingoDailyResponse>>(url);
 
             if (response == null || response.Count == 0)
             {
                 throw new Exception($"No data found for {symbol}");
             }
 
-            var latest = response[0];
+            var latest = response[^1];
+            decimal? prevClose = response.Count >= 2 ? response[^2].close : null;
+
             return new MarketPriceResponse
             {
                 Symbol = symbol,
-                Price = latest.tngoLast ?? latest.close ?? 0,
-                PreviousClose = latest.prevClose ?? 0,
+                Price = latest.close ?? 0,
+                PreviousClose = prevClose ?? 0,
                 Timestamp = latest.date ?? DateTime.UtcNow,
                 AssetType = "Stock"
             };