diff --git a/config/modules.php b/config/modules.php
new file mode 100644
index 0000000..c6df2ac
--- /dev/null
+++ b/config/modules.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Liste ordonnée des modules actifs (classes implémentant App\Shared\Domain\Module\ModuleInterface).
+ * Activer/désactiver un module = ajouter/commenter sa ligne. Exposé par GET /api/modules.
+ */
+return [
+    // Aucun module pour l'instant — les modules arrivent à partir du ticket 1.1 (Core).
+];
diff --git a/config/packages/security.yaml b/config/packages/security.yaml
index 35949cd..bcdbaa6 100644
--- a/config/packages/security.yaml
+++ b/config/packages/security.yaml
@@ -62,6 +62,8 @@ security:
         - { path: ^/api/docs, roles: PUBLIC_ACCESS }
         # Version de l'application en public
         - { path: ^/api/version, roles: PUBLIC_ACCESS, methods: [ GET ] }
+        # Liste des modules actifs en public (consommée au boot du front)
+        - { path: ^/api/modules, roles: PUBLIC_ACCESS, methods: [ GET ] }
         - { path: ^/_mcp, roles: PUBLIC_ACCESS, methods: [ GET ] }
         - { path: ^/_mcp, roles: IS_AUTHENTICATED_FULLY }
         # Mail : requiert authentification (le check ROLE_USER est dans MailAccessChecker)
diff --git a/src/Shared/Domain/Module/ModuleInterface.php b/src/Shared/Domain/Module/ModuleInterface.php
new file mode 100644
index 0000000..c390297
--- /dev/null
+++ b/src/Shared/Domain/Module/ModuleInterface.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Module;
+
+/**
+ * Implemented by every `*Module` declaration class. The set of active modules
+ * is listed in config/modules.php and exposed via GET /api/modules.
+ */
+interface ModuleInterface
+{
+    public static function id(): string;
+
+    public static function label(): string;
+
+    public static function isRequired(): bool;
+
+    /**
+     * @return list<array{code: string, label: string}>
+     */
+    public static function permissions(): array;
+}
diff --git a/src/Shared/Domain/Module/ModuleRegistry.php b/src/Shared/Domain/Module/ModuleRegistry.php
new file mode 100644
index 0000000..894b6af
--- /dev/null
+++ b/src/Shared/Domain/Module/ModuleRegistry.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Module;
+
+final class ModuleRegistry
+{
+    /**
+     * @param list<class-string> $moduleClasses
+     *
+     * @return list<string>
+     */
+    public static function ids(array $moduleClasses): array
+    {
+        $ids = [];
+        foreach ($moduleClasses as $moduleClass) {
+            if (is_a($moduleClass, ModuleInterface::class, true)) {
+                $ids[] = $moduleClass::id();
+            }
+        }
+
+        return $ids;
+    }
+}
diff --git a/src/Shared/Infrastructure/ApiPlatform/Resource/ModulesResource.php b/src/Shared/Infrastructure/ApiPlatform/Resource/ModulesResource.php
new file mode 100644
index 0000000..b00fd3a
--- /dev/null
+++ b/src/Shared/Infrastructure/ApiPlatform/Resource/ModulesResource.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Infrastructure\ApiPlatform\Resource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use App\Shared\Infrastructure\ApiPlatform\State\ModulesProvider;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            uriTemplate: '/modules',
+            normalizationContext: ['groups' => ['modules:read']],
+            provider: ModulesProvider::class,
+        ),
+    ],
+)]
+final class ModulesResource
+{
+    /**
+     * @var list<string>
+     */
+    #[Groups(['modules:read'])]
+    public array $modules = [];
+}
diff --git a/src/Shared/Infrastructure/ApiPlatform/State/ModulesProvider.php b/src/Shared/Infrastructure/ApiPlatform/State/ModulesProvider.php
new file mode 100644
index 0000000..b5204b7
--- /dev/null
+++ b/src/Shared/Infrastructure/ApiPlatform/State/ModulesProvider.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Infrastructure\ApiPlatform\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProviderInterface;
+use App\Shared\Domain\Module\ModuleRegistry;
+use App\Shared\Infrastructure\ApiPlatform\Resource\ModulesResource;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+final readonly class ModulesProvider implements ProviderInterface
+{
+    public function __construct(
+        #[Autowire('%kernel.project_dir%')]
+        private string $projectDir,
+    ) {}
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): ModulesResource
+    {
+        /** @var list<class-string> $classes */
+        $classes = require $this->projectDir.'/config/modules.php';
+
+        $dto          = new ModulesResource();
+        $dto->modules = ModuleRegistry::ids($classes);
+
+        return $dto;
+    }
+}
diff --git a/tests/Functional/Shared/ModulesEndpointTest.php b/tests/Functional/Shared/ModulesEndpointTest.php
new file mode 100644
index 0000000..9279ca5
--- /dev/null
+++ b/tests/Functional/Shared/ModulesEndpointTest.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Functional\Shared;
+
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+/**
+ * @internal
+ */
+final class ModulesEndpointTest extends WebTestCase
+{
+    public function testModulesEndpointIsPublicAndReturnsModulesKey(): void
+    {
+        $client = self::createClient();
+        $client->request('GET', '/api/modules');
+
+        self::assertResponseIsSuccessful();
+        $data = json_decode($client->getResponse()->getContent(), true);
+        self::assertArrayHasKey('modules', $data);
+        self::assertIsArray($data['modules']);
+    }
+}
diff --git a/tests/Unit/Shared/Module/ModuleRegistryTest.php b/tests/Unit/Shared/Module/ModuleRegistryTest.php
new file mode 100644
index 0000000..a5ea1aa
--- /dev/null
+++ b/tests/Unit/Shared/Module/ModuleRegistryTest.php
@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Shared\Module;
+
+use App\Shared\Domain\Module\ModuleInterface;
+use App\Shared\Domain\Module\ModuleRegistry;
+use PHPUnit\Framework\TestCase;
+use stdClass;
+
+/**
+ * @internal
+ */
+final class ModuleRegistryTest extends TestCase
+{
+    public function testIdsExtractsDeclaredModuleIds(): void
+    {
+        $classes = [FakeAlphaModule::class, FakeBetaModule::class];
+
+        self::assertSame(['alpha', 'beta'], ModuleRegistry::ids($classes));
+    }
+
+    public function testIdsIgnoresClassesNotImplementingModuleInterface(): void
+    {
+        $classes = [FakeAlphaModule::class, stdClass::class];
+
+        self::assertSame(['alpha'], ModuleRegistry::ids($classes));
+    }
+
+    public function testIdsReturnsEmptyArrayForNoModules(): void
+    {
+        self::assertSame([], ModuleRegistry::ids([]));
+    }
+}
+
+final class FakeAlphaModule implements ModuleInterface
+{
+    public static function id(): string
+    {
+        return 'alpha';
+    }
+
+    public static function label(): string
+    {
+        return 'Alpha';
+    }
+
+    public static function isRequired(): bool
+    {
+        return false;
+    }
+
+    public static function permissions(): array
+    {
+        return [];
+    }
+}
+
+final class FakeBetaModule implements ModuleInterface
+{
+    public static function id(): string
+    {
+        return 'beta';
+    }
+
+    public static function label(): string
+    {
+        return 'Beta';
+    }
+
+    public static function isRequired(): bool
+    {
+        return true;
+    }
+
+    public static function permissions(): array
+    {
+        return [];
+    }
+}