diff --git a/OsuCollectionDownloader/Services/ChimuService.cs b/OsuCollectionDownloader/Services/ChimuService.cs
index 3c2c636..9293d94 100644
--- a/OsuCollectionDownloader/Services/ChimuService.cs
+++ b/OsuCollectionDownloader/Services/ChimuService.cs
@@ -4,9 +4,9 @@
 
 namespace OsuCollectionDownloader.Services;
 
-internal sealed class ChimuService(HttpClient client) : IMirrorService
+internal sealed class ChimuService(HttpClient client) : IBeatmapService
 {
-    public string BaseApiUrl => "https://api.chimu.moe/v1";
+    private const string BaseApiUrl = "https://api.chimu.moe/v1";
 
     public async Task<Result<bool>> DownloadAsync(string filePath, int beatmapSetId, CancellationToken token)
     {
diff --git a/OsuCollectionDownloader/Services/NerinyanMirrorService.cs b/OsuCollectionDownloader/Services/NerinyanService.cs
similarity index 94%
rename from OsuCollectionDownloader/Services/NerinyanMirrorService.cs
rename to OsuCollectionDownloader/Services/NerinyanService.cs
index 3a019da..4b7c639 100644
--- a/OsuCollectionDownloader/Services/NerinyanMirrorService.cs
+++ b/OsuCollectionDownloader/Services/NerinyanService.cs
@@ -7,9 +7,9 @@
 
 namespace OsuCollectionDownloader.Services;
 
-internal class NerinyanMirrorService(HttpClient client) : IMirrorService
+internal sealed class NerinyanService(HttpClient client) : IBeatmapService
 {
-    public string BaseApiUrl => "https://api.nerinyan.moe";
+    private const string BaseApiUrl = "https://api.nerinyan.moe";
 
     public async Task<Result<bool>> DownloadAsync(string filePath, int beatmapSetId, CancellationToken token)
     {
diff --git a/OsuCollectionDownloader/Services/OsuDirectService.cs b/OsuCollectionDownloader/Services/OsuDirectService.cs
index e851f7d..79944cf 100644
--- a/OsuCollectionDownloader/Services/OsuDirectService.cs
+++ b/OsuCollectionDownloader/Services/OsuDirectService.cs
@@ -5,9 +5,9 @@
 
 namespace OsuCollectionDownloader.Services;
 
-internal sealed class OsuDirectService(HttpClient client) : IMirrorService
+internal sealed class OsuDirectService(HttpClient client) : IBeatmapService
 {
-    public string BaseApiUrl => "https://api.osu.direct";
+    private const string BaseApiUrl = "https://api.osu.direct";
 
     public async Task<Result<bool>> DownloadAsync(string filePath, int beatmapSetId, CancellationToken token)
     {