diff --git a/.github/workflows/shorebird_code_push_api.yaml b/.github/workflows/shorebird_code_push_api.yaml
index 52d4d726..7fdbd69a 100644
--- a/.github/workflows/shorebird_code_push_api.yaml
+++ b/.github/workflows/shorebird_code_push_api.yaml
@@ -20,6 +20,11 @@ on:
       - "packages/shorebird_code_push_api/test/**"
       - "packages/shorebird_code_push_api/pubspec.yaml"
 
+env:
+  PROJECT_ID: shorebird-code-push-api
+  SERVICE: shorebird-code-push-api
+  REGION: us-central1
+
 jobs:
   semantic-pull-request:
     uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/semantic_pull_request.yml@v1
@@ -33,3 +38,46 @@ jobs:
     uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/pana.yml@v1
     with:
       working_directory: packages/shorebird_code_push_api
+
+  deploy:
+    needs: build
+
+    defaults:
+      run:
+        working-directory: packages/shorebird_code_push_api
+
+    runs-on: ubuntu-latest
+
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Cloud SDK
+        uses: google-github-actions/setup-gcloud@v0.2.0
+        with:
+          project_id: ${{ env.PROJECT_ID }}
+          service_account_key: ${{ secrets.CLOUD_RUN_SA }}
+          export_default_credentials: true
+
+      - name: Authorize Docker Push
+        run: gcloud auth configure-docker
+
+      - name: Build and Push Container
+        run: |-
+          docker build -t gcr.io/${{ env.PROJECT_ID }}/${{ env.SERVICE }}:${{ github.sha }} .
+          docker push gcr.io/${{ env.PROJECT_ID }}/${{ env.SERVICE }}:${{ github.sha }}
+
+      - name: Deploy to Cloud Run
+        id: deploy
+        uses: google-github-actions/deploy-cloudrun@v0.4.0
+        with:
+          service: ${{ env.SERVICE }}
+          image: gcr.io/${{ env.PROJECT_ID }}/${{ env.SERVICE }}:${{ github.sha }}
+          region: ${{ env.REGION }}
+
+      - name: Show Output
+        run: echo ${{ steps.deploy.outputs.url }}
+
+      - name: Ping
+        run: curl "${{ steps.deploy.outputs.url }}"
diff --git a/packages/shorebird_code_push_api/.gitignore b/packages/shorebird_code_push_api/.gitignore
index 526da158..a4385834 100644
--- a/packages/shorebird_code_push_api/.gitignore
+++ b/packages/shorebird_code_push_api/.gitignore
@@ -4,4 +4,6 @@
 .dart_tool/
 .packages
 build/
-pubspec.lock
\ No newline at end of file
+pubspec.lock
+coverage/
+cache/
\ No newline at end of file
diff --git a/packages/shorebird_code_push_api/analysis_options.yaml b/packages/shorebird_code_push_api/analysis_options.yaml
index 84e34fba..d767e5d3 100644
--- a/packages/shorebird_code_push_api/analysis_options.yaml
+++ b/packages/shorebird_code_push_api/analysis_options.yaml
@@ -1 +1,4 @@
 include: package:very_good_analysis/analysis_options.4.0.0.yaml
+linter:
+  rules:
+    public_member_api_docs: false
diff --git a/packages/shorebird_code_push_api/bin/server.dart b/packages/shorebird_code_push_api/bin/server.dart
index 1fa9db67..46548c45 100644
--- a/packages/shorebird_code_push_api/bin/server.dart
+++ b/packages/shorebird_code_push_api/bin/server.dart
@@ -3,15 +3,24 @@ import 'dart:io';
 import 'package:shelf/shelf.dart';
 import 'package:shelf/shelf_io.dart' as shelf_io;
 import 'package:shelf_router/shelf_router.dart' as shelf_router;
+import 'package:shorebird_code_push_api/src/middleware/middleware.dart';
+import 'package:shorebird_code_push_api/src/routes/routes.dart';
 
 Future<void> main() async {
   final port = int.parse(Platform.environment['PORT'] ?? '8080');
   final router = shelf_router.Router()
-    ..all('/', (_) => Response.ok('Hello, world!'));
+    ..all('/', (_) => Response(HttpStatus.noContent))
+    ..post('/api/v1/updates', checkForUpdatesHandler)
+    ..get('/api/v1/releases/<version>', downloadReleaseHandler)
+    ..post('/api/v1/releases', uploadReleaseHandler);
+
+  final handler = const Pipeline()
+      .addMiddleware(versionStoreProvider)
+      .addHandler(router.call);
 
   final server = await shelf_io.serve(
-    logRequests().addHandler(router.call),
-    InternetAddress.anyIPv6,
+    logRequests().addHandler(handler),
+    InternetAddress.anyIPv4,
     port,
   );
 
diff --git a/packages/shorebird_code_push_api/lib/shorebird_code_push_api.dart b/packages/shorebird_code_push_api/lib/shorebird_code_push_api.dart
deleted file mode 100644
index 17127c20..00000000
--- a/packages/shorebird_code_push_api/lib/shorebird_code_push_api.dart
+++ /dev/null
@@ -1,4 +0,0 @@
-/// The Shorebird CodePush API
-library shorebird_code_push_api;
-
-export 'src/shorebird_code_push_api.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/config.dart b/packages/shorebird_code_push_api/lib/src/config.dart
new file mode 100644
index 00000000..bf28939f
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/config.dart
@@ -0,0 +1 @@
+const cachePath = 'cache';
diff --git a/packages/shorebird_code_push_api/lib/src/middleware/middleware.dart b/packages/shorebird_code_push_api/lib/src/middleware/middleware.dart
new file mode 100644
index 00000000..036aa574
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/middleware/middleware.dart
@@ -0,0 +1 @@
+export 'version_store_provider.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/middleware/version_store_provider.dart b/packages/shorebird_code_push_api/lib/src/middleware/version_store_provider.dart
new file mode 100644
index 00000000..50f52335
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/middleware/version_store_provider.dart
@@ -0,0 +1,7 @@
+import 'package:shorebird_code_push_api/src/config.dart' as config;
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+
+const _versionStore = VersionStore(cachePath: config.cachePath);
+
+final versionStoreProvider = provider<VersionStore>((_) => _versionStore);
diff --git a/packages/shorebird_code_push_api/lib/src/provider.dart b/packages/shorebird_code_push_api/lib/src/provider.dart
new file mode 100644
index 00000000..3ff5c799
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/provider.dart
@@ -0,0 +1,25 @@
+import 'package:shelf/shelf.dart';
+
+extension ProvideExtension on Request {
+  Request provide<T extends Object>(T Function() create) {
+    return change(context: {...context, '$T': create});
+  }
+
+  T lookup<T>() {
+    final value = context['$T'];
+    if (value == null) {
+      throw StateError(
+        '''
+request.lookup<$T>() called with a request request that does not contain a $T.
+''',
+      );
+    }
+    return (value as T Function())();
+  }
+}
+
+Middleware provider<T extends Object>(T Function(Request request) create) {
+  return (handler) {
+    return (req) => handler(req.provide(() => create(req)));
+  };
+}
diff --git a/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates.dart b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates.dart
new file mode 100644
index 00000000..63a00823
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates.dart
@@ -0,0 +1,2 @@
+export 'check_for_updates_handler.dart';
+export 'models/models.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates_handler.dart b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates_handler.dart
new file mode 100644
index 00000000..1028a1f6
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/check_for_updates_handler.dart
@@ -0,0 +1,39 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/routes/check_for_updates/check_for_updates.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+
+Future<Response> checkForUpdatesHandler(Request request) async {
+  late final CheckForUpdatesRequest checkForUpdatesRequest;
+  try {
+    checkForUpdatesRequest = CheckForUpdatesRequest.fromJson(
+      jsonDecode(await request.readAsString()) as Map<String, dynamic>,
+    );
+  } catch (_) {
+    return Response.badRequest(
+      body: 'Invalid request body',
+      headers: {HttpHeaders.contentTypeHeader: ContentType.text.value},
+    );
+  }
+
+  final store = request.lookup<VersionStore>();
+  final latestVersion = store.latestVersionForClient(
+    checkForUpdatesRequest.clientId,
+    currentVersion: checkForUpdatesRequest.version,
+  );
+
+  final response = latestVersion == null
+      ? const CheckForUpdatesResponse()
+      : CheckForUpdatesResponse(
+          updateAvailable: true,
+          update: Update(version: latestVersion, hash: ''),
+        );
+
+  return Response.ok(
+    json.encode(response.toJson()),
+    headers: {HttpHeaders.contentTypeHeader: ContentType.json.value},
+  );
+}
diff --git a/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_request.dart b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_request.dart
new file mode 100644
index 00000000..0578b68a
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_request.dart
@@ -0,0 +1,31 @@
+class CheckForUpdatesRequest {
+  const CheckForUpdatesRequest({
+    required this.version,
+    required this.platform,
+    required this.arch,
+    required this.clientId,
+  });
+
+  factory CheckForUpdatesRequest.fromJson(Map<String, dynamic> json) {
+    return CheckForUpdatesRequest(
+      version: (json['version'] ?? '') as String,
+      platform: json['platform'] as String,
+      arch: json['arch'] as String,
+      clientId: json['client_id'] as String,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'version': version,
+      'platform': platform,
+      'arch': arch,
+      'client_id': clientId,
+    };
+  }
+
+  final String version;
+  final String platform;
+  final String arch;
+  final String clientId;
+}
diff --git a/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_response.dart b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_response.dart
new file mode 100644
index 00000000..a64f65c8
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/check_for_updates_response.dart
@@ -0,0 +1,35 @@
+class CheckForUpdatesResponse {
+  const CheckForUpdatesResponse({
+    this.updateAvailable = false,
+    this.update,
+  });
+
+  final bool updateAvailable;
+  final Update? update;
+
+  Map<String, dynamic> toJson() {
+    return <String, dynamic>{
+      'update_available': updateAvailable,
+      if (update != null) 'update': update!.toJson(),
+    };
+  }
+}
+
+class Update {
+  const Update({required this.version, required this.hash});
+
+  final String version;
+  final String hash;
+
+  Map<String, dynamic> toJson() {
+    return <String, dynamic>{
+      'version': version,
+      'hash': hash,
+      'download_url': downloadUrlForVersion(version),
+    };
+  }
+
+  String downloadUrlForVersion(String version) {
+    return 'http://localhost:8080/releases/$version.txt';
+  }
+}
diff --git a/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/models.dart b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/models.dart
new file mode 100644
index 00000000..030bbd45
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/check_for_updates/models/models.dart
@@ -0,0 +1,2 @@
+export 'check_for_updates_request.dart';
+export 'check_for_updates_response.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release.dart b/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release.dart
new file mode 100644
index 00000000..d4a93c91
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release.dart
@@ -0,0 +1 @@
+export 'download_release_handler.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release_handler.dart b/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release_handler.dart
new file mode 100644
index 00000000..d198d46b
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/download_release/download_release_handler.dart
@@ -0,0 +1,19 @@
+import 'dart:io';
+
+import 'package:path/path.dart' as path;
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+
+Future<Response> downloadReleaseHandler(
+  Request request,
+  String versionWithExtension,
+) async {
+  final version = path.withoutExtension(versionWithExtension);
+  final releasePath =
+      request.lookup<VersionStore>().filePathForVersion(version);
+  final file = File(releasePath);
+  if (!file.existsSync()) return Response.notFound('Release not found');
+  final bytes = file.openRead();
+  return Response.ok(bytes);
+}
diff --git a/packages/shorebird_code_push_api/lib/src/routes/routes.dart b/packages/shorebird_code_push_api/lib/src/routes/routes.dart
new file mode 100644
index 00000000..7fb726d7
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/routes.dart
@@ -0,0 +1,3 @@
+export 'check_for_updates/check_for_updates.dart';
+export 'download_release/download_release.dart';
+export 'upload_release/upload_release.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release.dart b/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release.dart
new file mode 100644
index 00000000..f2ad5914
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release.dart
@@ -0,0 +1 @@
+export 'upload_release_handler.dart';
diff --git a/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release_handler.dart b/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release_handler.dart
new file mode 100644
index 00000000..a998638a
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/routes/upload_release/upload_release_handler.dart
@@ -0,0 +1,45 @@
+import 'dart:io';
+
+import 'package:shelf/shelf.dart';
+import 'package:shelf_multipart/form_data.dart';
+import 'package:shelf_multipart/multipart.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+
+Future<Response> uploadReleaseHandler(Request request) async {
+  if (!request.isMultipart || !request.isMultipartForm) {
+    return Response.badRequest(body: 'Expected multipart form request');
+  }
+
+  final store = request.lookup<VersionStore>();
+
+  store.cacheDir.createSync(recursive: true);
+
+  final nextVersion = store.getNextVersion();
+  final path = store.filePathForVersion(nextVersion);
+
+  var foundFile = false;
+
+  try {
+    await for (final formData in request.multipartFormData) {
+      // 'file' is just the name of the field we used in this form.
+      if (formData.name == 'file') {
+        if (foundFile) {
+          throw Exception('Unexpected form data: ${formData.name}');
+        }
+        final file = File(path);
+        await file.create();
+        await file.writeAsBytes(await formData.part.readBytes(), flush: true);
+        foundFile = true;
+        continue;
+      } else {
+        throw Exception('Unexpected form data: ${formData.name}');
+      }
+    }
+    if (!foundFile) throw Exception('Missing file');
+  } catch (error) {
+    return Response.badRequest(body: error.toString());
+  }
+
+  return Response(HttpStatus.created, body: 'OK');
+}
diff --git a/packages/shorebird_code_push_api/lib/src/shorebird_code_push_api.dart b/packages/shorebird_code_push_api/lib/src/shorebird_code_push_api.dart
deleted file mode 100644
index f1065833..00000000
--- a/packages/shorebird_code_push_api/lib/src/shorebird_code_push_api.dart
+++ /dev/null
@@ -1,7 +0,0 @@
-/// {@template shorebird_code_push_api}
-/// The Shorebird CodePush API
-/// {@endtemplate}
-class ShorebirdCodePushApi {
-  /// {@macro shorebird_code_push_api}
-  const ShorebirdCodePushApi();
-}
diff --git a/packages/shorebird_code_push_api/lib/src/version_store.dart b/packages/shorebird_code_push_api/lib/src/version_store.dart
new file mode 100644
index 00000000..dcbd1148
--- /dev/null
+++ b/packages/shorebird_code_push_api/lib/src/version_store.dart
@@ -0,0 +1,56 @@
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:version/version.dart';
+
+int _compareVersions(String a, String b) {
+  return Version.parse(a).compareTo(Version.parse(b));
+}
+
+class VersionStore {
+  const VersionStore({required this.cachePath});
+
+  final String cachePath;
+
+  Directory get cacheDir {
+    return Directory(p.join(Directory.current.path, cachePath));
+  }
+
+  // Should take an api key/product name, etc.
+  String getNextVersion() {
+    final latest = latestVersionForClient('client') ?? '0.0.0';
+    final next = Version.parse(latest).incrementPatch().toString();
+    return next;
+  }
+
+  void addVersion(String version, List<int> bytes) {
+    cacheDir.createSync(recursive: true);
+    final path = filePathForVersion(version);
+    File(path).writeAsBytesSync(bytes);
+  }
+
+  String? latestVersionForClient(String clientId, {String? currentVersion}) {
+    final versions = _versionsForClientId(clientId).toList()
+      ..sort(_compareVersions);
+    if (versions.isEmpty) return null;
+    if (versions.last == currentVersion) return null;
+
+    return versions.last;
+  }
+
+  String filePathForVersion(String version) {
+    return p.join(cacheDir.path, '$version.txt');
+  }
+
+  Iterable<String> _versionsForClientId(String clientId) {
+    // This should use the clientId to get a productId and look up the versions
+    // based on productId/architecture, etc.
+    try {
+      final dir = cacheDir;
+      final files = dir.listSync();
+      return files.map((e) => p.basenameWithoutExtension(e.path));
+    } catch (e) {
+      return [];
+    }
+  }
+}
diff --git a/packages/shorebird_code_push_api/pubspec.yaml b/packages/shorebird_code_push_api/pubspec.yaml
index 32c2c027..b8540cad 100644
--- a/packages/shorebird_code_push_api/pubspec.yaml
+++ b/packages/shorebird_code_push_api/pubspec.yaml
@@ -7,8 +7,11 @@ environment:
   sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
+  path: ^1.8.3
   shelf: ^1.4.0
+  shelf_multipart: ^1.0.0
   shelf_router: ^1.1.3
+  version: ^3.0.2
 
 dev_dependencies:
   mocktail: ^0.3.0
diff --git a/packages/shorebird_code_push_api/test/fixtures/release.txt b/packages/shorebird_code_push_api/test/fixtures/release.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/packages/shorebird_code_push_api/test/src/middleware/version_store_provider_test.dart b/packages/shorebird_code_push_api/test/src/middleware/version_store_provider_test.dart
new file mode 100644
index 00000000..7f6ded73
--- /dev/null
+++ b/packages/shorebird_code_push_api/test/src/middleware/version_store_provider_test.dart
@@ -0,0 +1,24 @@
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/middleware/middleware.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('versionStoreProvider', () {
+    test('provides a version store instance', () async {
+      VersionStore? store;
+
+      final handler = versionStoreProvider(
+        (req) {
+          store = req.lookup<VersionStore>();
+          return Response.ok('');
+        },
+      );
+      final request = Request('GET', Uri.parse('http://localhost/'));
+
+      await handler(request);
+      expect(store, isNotNull);
+    });
+  });
+}
diff --git a/packages/shorebird_code_push_api/test/src/provider_test.dart b/packages/shorebird_code_push_api/test/src/provider_test.dart
new file mode 100644
index 00000000..73993d4f
--- /dev/null
+++ b/packages/shorebird_code_push_api/test/src/provider_test.dart
@@ -0,0 +1,45 @@
+import 'dart:io';
+
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('values can be provided and read via middleware', () async {
+    const value = '__test_value__';
+    Handler middleware(Handler handler) {
+      return (request) {
+        return handler(request.provide(() => value));
+      };
+    }
+
+    Response onRequest(Request request) {
+      final value = request.lookup<String>();
+      return Response.ok(value);
+    }
+
+    final handler =
+        const Pipeline().addMiddleware(middleware).addHandler(onRequest);
+
+    final request = Request('GET', Uri.parse('http://localhost/'));
+    final response = await handler(request);
+
+    await expectLater(response.statusCode, equals(HttpStatus.ok));
+    await expectLater(await response.readAsString(), equals(value));
+  });
+
+  test('A StateError is thrown when reading an un-provided value', () async {
+    Response onRequest(Request request) {
+      request.lookup<Uri>();
+      return Response.ok('');
+    }
+
+    final handler = const Pipeline()
+        .addMiddleware((handler) => handler)
+        .addHandler(onRequest);
+
+    final request = Request('GET', Uri.parse('http://localhost/'));
+
+    await expectLater(() => handler(request), throwsStateError);
+  });
+}
diff --git a/packages/shorebird_code_push_api/test/src/routes/check_for_updates/check_for_updates_handler_test.dart b/packages/shorebird_code_push_api/test/src/routes/check_for_updates/check_for_updates_handler_test.dart
new file mode 100644
index 00000000..b2e0251d
--- /dev/null
+++ b/packages/shorebird_code_push_api/test/src/routes/check_for_updates/check_for_updates_handler_test.dart
@@ -0,0 +1,95 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:mocktail/mocktail.dart';
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/routes/check_for_updates/check_for_updates.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+import 'package:test/test.dart';
+
+class _MockVersionStore extends Mock implements VersionStore {}
+
+void main() {
+  group('checkForUpdatesHandler', () {
+    final uri = Uri.parse('http://localhost/');
+
+    late VersionStore store;
+
+    setUp(() {
+      store = _MockVersionStore();
+    });
+
+    test('returns 400 if request body is invalid', () async {
+      final request = Request('POST', uri);
+      final response = await checkForUpdatesHandler(request);
+
+      expect(response.statusCode, HttpStatus.badRequest);
+    });
+
+    test(
+        'returns 200 no update available '
+        'when unable to get latest version', () async {
+      const payload = CheckForUpdatesRequest(
+        version: '1.0.0',
+        platform: 'android',
+        arch: 'arm64',
+        clientId: 'client-id',
+      );
+
+      when(
+        () => store.latestVersionForClient(
+          any(),
+          currentVersion: any(named: 'currentVersion'),
+        ),
+      ).thenReturn(null);
+
+      final request = Request(
+        'POST',
+        uri,
+        body: json.encode(payload.toJson()),
+      ).provide(() => store);
+
+      final response = await checkForUpdatesHandler(request);
+
+      expect(response.statusCode, HttpStatus.ok);
+
+      final body = await response.readAsString();
+      expect(body, equals('{"update_available":false}'));
+    });
+
+    test('returns 200 update available when version is not latest', () async {
+      const payload = CheckForUpdatesRequest(
+        version: '1.0.0',
+        platform: 'android',
+        arch: 'arm64',
+        clientId: 'client-id',
+      );
+
+      when(
+        () => store.latestVersionForClient(
+          any(),
+          currentVersion: any(named: 'currentVersion'),
+        ),
+      ).thenReturn('1.0.1');
+
+      final request = Request(
+        'POST',
+        uri,
+        body: json.encode(payload.toJson()),
+      ).provide(() => store);
+
+      final response = await checkForUpdatesHandler(request);
+
+      expect(response.statusCode, HttpStatus.ok);
+
+      final body = await response.readAsString();
+      expect(
+        body,
+        equals(
+          '{"update_available":true,"update":{"version":"1.0.1","hash":"","download_url":"http://localhost:8080/releases/1.0.1.txt"}}',
+        ),
+      );
+    });
+  });
+}
diff --git a/packages/shorebird_code_push_api/test/src/routes/download_release/download_release_handler_test.dart b/packages/shorebird_code_push_api/test/src/routes/download_release/download_release_handler_test.dart
new file mode 100644
index 00000000..9c7b55be
--- /dev/null
+++ b/packages/shorebird_code_push_api/test/src/routes/download_release/download_release_handler_test.dart
@@ -0,0 +1,42 @@
+import 'dart:io';
+
+import 'package:mocktail/mocktail.dart';
+import 'package:path/path.dart' as path;
+import 'package:shelf/shelf.dart';
+import 'package:shorebird_code_push_api/src/provider.dart';
+import 'package:shorebird_code_push_api/src/routes/download_release/download_release.dart';
+import 'package:shorebird_code_push_api/src/version_store.dart';
+import 'package:test/test.dart';
+
+class _MockVersionStore extends Mock implements VersionStore {}
+
+void main() {
+  group('downloadReleaseHandler', () {
+    final uri = Uri.parse('http://localhost/');
+    late VersionStore store;
+
+    setUp(() {
+      store = _MockVersionStore();
+    });
+
+    test('returns 404 if release not found', () async {
+      when(() => store.filePathForVersion('1.0.0')).thenReturn('not-found');
+
+      final request = Request('GET', uri).provide(() => store);
+      final response = await downloadReleaseHandler(request, '1.0.0.txt');
+
+      expect(response.statusCode, HttpStatus.notFound);
+    });
+
+    test('returns 200 if release found', () async {
+      when(
+        () => store.filePathForVersion('1.0.0'),
+      ).thenReturn(path.join('test', 'fixtures', 'release.txt'));
+
+      final request = Request('GET', uri).provide(() => store);
+      final response = await downloadReleaseHandler(request, '1.0.0.txt');
+
+      expect(response.statusCode, HttpStatus.ok);
+    });
+  });
+}
diff --git a/packages/shorebird_code_push_api/test/src/shorebird_code_push_api_test.dart b/packages/shorebird_code_push_api/test/src/shorebird_code_push_api_test.dart
deleted file mode 100644
index c4ec44cc..00000000
--- a/packages/shorebird_code_push_api/test/src/shorebird_code_push_api_test.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-// ignore_for_file: prefer_const_constructors
-import 'package:shorebird_code_push_api/shorebird_code_push_api.dart';
-import 'package:test/test.dart';
-
-void main() {
-  group('ShorebirdCodePushApi', () {
-    test('can be instantiated', () {
-      expect(ShorebirdCodePushApi(), isNotNull);
-    });
-  });
-}
diff --git a/packages/shorebird_code_push_api/test/src/version_store_test.dart b/packages/shorebird_code_push_api/test/src/version_store_test.dart
new file mode 100644
index 00000000..aa6fda9f
--- /dev/null
+++ b/packages/shorebird_code_push_api/test/src/version_store_test.dart
@@ -0,0 +1,47 @@
+import 'dart:io';
+
+import 'package:shorebird_code_push_api/src/version_store.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('VersionStore', () {
+    group('getNextVersion', () {
+      test('returns 0.0.1 when no versions exist', () {
+        final tempDir = Directory.systemTemp.createTempSync();
+        final store = VersionStore(cachePath: tempDir.path);
+        expect(store.getNextVersion(), equals('0.0.1'));
+      });
+
+      test('returns 0.0.2 when 0.0.1 exists', () {
+        final tempDir = Directory.systemTemp.createTempSync();
+        final store = VersionStore(cachePath: tempDir.path)
+          ..addVersion('0.0.1', []);
+        expect(store.getNextVersion(), equals('0.0.2'));
+      });
+    });
+
+    group('latestVersionForClient', () {
+      test('returns null when cache does not exist', () {
+        const store = VersionStore(cachePath: 'invalid-path');
+        expect(store.latestVersionForClient('empty-client-id'), isNull);
+      });
+
+      test('returns null when no versions exist', () {
+        final tempDir = Directory.systemTemp.createTempSync();
+        final store = VersionStore(cachePath: tempDir.path);
+        expect(store.latestVersionForClient('empty-client-id'), isNull);
+      });
+
+      test('returns latest version when multiple versions exist', () {
+        final tempDir = Directory.systemTemp.createTempSync();
+        final store = VersionStore(cachePath: tempDir.path)
+          ..addVersion('0.0.1', [])
+          ..addVersion('0.0.2', []);
+        expect(
+          store.latestVersionForClient('empty-client-id'),
+          equals('0.0.2'),
+        );
+      });
+    });
+  });
+}