diff --git a/README.md b/README.md
index b1f649c..83e5f1f 100644
--- a/README.md
+++ b/README.md
@@ -179,7 +179,7 @@ auto token = client.tokens().create(opts);
 decart::ClientOptions options;
 options.apiKey = "sk-...";                  // or set DECART_API_KEY
 options.baseUrl = "https://api.decart.ai";  // HTTP API (tokens)
-options.realtimeBaseUrl = "wss://api3.decart.ai"; // signaling
+options.realtimeBaseUrl = "wss://api.decart.ai"; // signaling
 options.integration = "my-app";             // included in the User-Agent
 decart::Client client(options);
 ```
diff --git a/include/decart/client.h b/include/decart/client.h
index 8479eee..0cd35e7 100644
--- a/include/decart/client.h
+++ b/include/decart/client.h
@@ -18,7 +18,7 @@ struct ClientOptions {
   std::string apiKey;
   /// Override the HTTP API base URL (default "https://api.decart.ai").
   std::string baseUrl;
-  /// Override the realtime signaling base URL (default "wss://api3.decart.ai").
+  /// Override the realtime signaling base URL (default "wss://api.decart.ai").
   std::string realtimeBaseUrl;
   /// Optional integration identifier, included in the User-Agent.
   std::string integration;
diff --git a/src/client.cpp b/src/client.cpp
index 0d794ce..6b2ca65 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -50,7 +50,7 @@ Client::Client(ClientOptions options) : impl_(std::make_unique<Impl>()) {
   }
 
   std::string realtimeBaseUrl =
-      options.realtimeBaseUrl.empty() ? "wss://api3.decart.ai" : options.realtimeBaseUrl;
+      options.realtimeBaseUrl.empty() ? "wss://api.decart.ai" : options.realtimeBaseUrl;
   if (!startsWith(realtimeBaseUrl, "ws://") && !startsWith(realtimeBaseUrl, "wss://")) {
     throw Exception(Error{ErrorCode::InvalidBaseUrl,
                           "Invalid realtime base URL (must be ws:// or wss://): " + realtimeBaseUrl});
diff --git a/src/detail/client_config.h b/src/detail/client_config.h
index 68c33f2..22633c9 100644
--- a/src/detail/client_config.h
+++ b/src/detail/client_config.h
@@ -10,7 +10,7 @@ namespace decart::detail {
 struct ClientConfig {
   std::string apiKey;
   std::string baseUrl;         // e.g. "https://api.decart.ai"
-  std::string realtimeBaseUrl; // e.g. "wss://api3.decart.ai"
+  std::string realtimeBaseUrl; // e.g. "wss://api.decart.ai"
   std::string integration;
 };
 
diff --git a/src/detail/signaling_channel.h b/src/detail/signaling_channel.h
index f7ce8de..c5a6b04 100644
--- a/src/detail/signaling_channel.h
+++ b/src/detail/signaling_channel.h
@@ -27,7 +27,7 @@ struct RoomInfo {
   std::string sessionId;
 };
 
-/// The Decart realtime signaling channel: a WebSocket to `wss://api3.decart.ai`
+/// The Decart realtime signaling channel: a WebSocket to `wss://api.decart.ai`
 /// that performs the join handshake, carries prompt/image control messages
 /// (request/ack), and forwards server events. Media flows separately over
 /// LiveKit. See [[decart-realtime-wire-protocol]].
diff --git a/tests/test_stream_url.cpp b/tests/test_stream_url.cpp
index b017ef8..daf7b33 100644
--- a/tests/test_stream_url.cpp
+++ b/tests/test_stream_url.cpp
@@ -13,7 +13,7 @@ using namespace decart::detail;
 
 namespace {
 
-const std::string kBase = "wss://api3.decart.ai";
+const std::string kBase = "wss://api.decart.ai";
 const std::string kKey = "sk-test";
 
 std::size_t count(const std::string& haystack, const std::string& needle) {
@@ -39,7 +39,7 @@ struct LogCapture {
 TEST_CASE("buildStreamUrl without options is unchanged and carries no speed param") {
   const auto model = models::realtime("lucy-2.5");
   const auto url = buildStreamUrl(kBase, model, kKey, std::nullopt, std::nullopt);
-  CHECK(url == "wss://api3.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5");
+  CHECK(url == "wss://api.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5");
   CHECK(url.find("speed") == std::string::npos);
   CHECK(url.find("resolution") == std::string::npos);
 }
@@ -47,7 +47,7 @@ TEST_CASE("buildStreamUrl without options is unchanged and carries no speed para
 TEST_CASE("buildStreamUrl appends resolution after model") {
   const auto model = models::realtime("lucy-2.5");
   const auto url = buildStreamUrl(kBase, model, kKey, std::string("1080p"), std::nullopt);
-  CHECK(url == "wss://api3.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&resolution=1080p");
+  CHECK(url == "wss://api.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&resolution=1080p");
 }
 
 TEST_CASE("buildStreamUrl appends speed=fast exactly once, after resolution") {
@@ -55,20 +55,20 @@ TEST_CASE("buildStreamUrl appends speed=fast exactly once, after resolution") {
 
   SUBCASE("speed only") {
     const auto url = buildStreamUrl(kBase, model, kKey, std::nullopt, Speed::Fast);
-    CHECK(url == "wss://api3.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&speed=fast");
+    CHECK(url == "wss://api.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&speed=fast");
     CHECK(count(url, "speed=") == 1);
   }
 
   SUBCASE("speed with resolution") {
     const auto url = buildStreamUrl(kBase, model, kKey, std::string("720p"), Speed::Fast);
-    CHECK(url == "wss://api3.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&resolution=720p&speed=fast");
+    CHECK(url == "wss://api.decart.ai/v1/stream?api_key=sk-test&model=lucy-2.5&resolution=720p&speed=fast");
     CHECK(count(url, "speed=") == 1);
   }
 
   SUBCASE("still sent for models without the capability (server ignores it)") {
     const auto restyle = models::realtime("lucy-restyle-2");
     const auto url = buildStreamUrl(kBase, restyle, kKey, std::nullopt, Speed::Fast);
-    CHECK(url == "wss://api3.decart.ai/v1/stream?api_key=sk-test&model=lucy-restyle-2&speed=fast");
+    CHECK(url == "wss://api.decart.ai/v1/stream?api_key=sk-test&model=lucy-restyle-2&speed=fast");
   }
 }