diff --git a/packages/clerk_auth/lib/clerk_auth.dart b/packages/clerk_auth/lib/clerk_auth.dart
index a009423..4b88f18 100644
--- a/packages/clerk_auth/lib/clerk_auth.dart
+++ b/packages/clerk_auth/lib/clerk_auth.dart
@@ -1,6 +1,7 @@
 /// Package that will allow you to authenticate and use Clerk from Dart code.
 library clerk_auth;
 
+export 'clerk_constants.dart';
 export 'src/clerk_api/api.dart';
 export 'src/clerk_auth/auth.dart';
 export 'src/clerk_auth/persistor.dart';
diff --git a/packages/clerk_auth/lib/clerk_constants.dart b/packages/clerk_auth/lib/clerk_constants.dart
new file mode 100644
index 0000000..8a1d342
--- /dev/null
+++ b/packages/clerk_auth/lib/clerk_constants.dart
@@ -0,0 +1,8 @@
+/// constant values
+sealed class ClerkConstants {
+  /// value for the `clerk-api-version` header in API requests
+  static const clerkApiVersion = '2024-10-01';
+
+  /// value for the `x-flutter-sdk-version` header in API requests
+  static const flutterSdkVersion = '0.0.4-dev';
+}
diff --git a/packages/clerk_auth/lib/src/clerk_api/api.dart b/packages/clerk_auth/lib/src/clerk_api/api.dart
index 33a9c5f..e609533 100644
--- a/packages/clerk_auth/lib/src/clerk_api/api.dart
+++ b/packages/clerk_auth/lib/src/clerk_api/api.dart
@@ -66,6 +66,9 @@ class Api with Logging {
   static const _kErrorsKey = 'errors';
   static const _kClientKey = 'client';
   static const _kResponseKey = 'response';
+  static const _kClerkAPIVersion = 'clerk-api-version';
+  static const _kXFlutterSDKVersion = 'x-flutter-sdk-version';
+  static const _kXMobile = 'x-mobile';
 
   static const _defaultPollDelay = Duration(seconds: 55);
 
@@ -674,6 +677,9 @@ class Api with Logging {
           : 'application/x-www-form-urlencoded',
       if (_tokenCache.clientToken.isNotEmpty) //
         HttpHeaders.authorizationHeader: _tokenCache.clientToken,
+      _kClerkAPIVersion: ClerkConstants.clerkApiVersion,
+      _kXFlutterSDKVersion: ClerkConstants.flutterSdkVersion,
+      _kXMobile: '1',
       ...?headers,
     };
   }
diff --git a/packages/clerk_auth/lib/src/clerk_auth/http_client.dart b/packages/clerk_auth/lib/src/clerk_auth/http_client.dart
index bedca74..0bb55c2 100644
--- a/packages/clerk_auth/lib/src/clerk_auth/http_client.dart
+++ b/packages/clerk_auth/lib/src/clerk_auth/http_client.dart
@@ -74,9 +74,13 @@ class DefaultHttpClient implements HttpClient {
   }) async {
     final request = Request(method.toString(), uri);
 
-    if (headers != null) request.headers.addAll(headers);
+    if (headers case Map<String, String> headers) {
+      request.headers.addAll(headers);
+    }
 
-    if (params != null) request.bodyFields = params.toStringMap();
+    if (params case Map<String, dynamic> params) {
+      request.bodyFields = params.toStringMap();
+    }
 
     final streamedResponse = await request.send();
     return Response.fromStream(streamedResponse);