diff --git a/app/Http/Controllers/Api/MeetupEventController.php b/app/Http/Controllers/Api/MeetupEventController.php
index 0e1bf5f..91ca352 100644
--- a/app/Http/Controllers/Api/MeetupEventController.php
+++ b/app/Http/Controllers/Api/MeetupEventController.php
@@ -59,10 +59,13 @@ class MeetupEventController extends Controller
             ->get();
 
         return $events->map(fn ($event) => [
+            'id' => $event->id,
             'start' => $event->start->format('Y-m-d H:i'),
             'location' => $event->location,
             'description' => $event->description,
             'link' => $event->link,
+            'attendees' => $event->attendeesCount(),
+            'might_attendees' => $event->mightAttendeesCount(),
             'meetup.name' => $event->meetup->name,
             'meetup.portalLink' => url()->route(
                 'meetups.landingpage',
@@ -202,8 +205,8 @@ class MeetupEventController extends Controller
     {
         return [
             'status' => $meetupEvent->rsvpStatusFor($user)->value,
-            'attendees' => count($meetupEvent->attendees ?? []),
-            'might_attendees' => count($meetupEvent->might_attendees ?? []),
+            'attendees' => $meetupEvent->attendeesCount(),
+            'might_attendees' => $meetupEvent->mightAttendeesCount(),
         ];
     }
 }
diff --git a/app/Models/Meetup.php b/app/Models/Meetup.php
index 647ae1b..b93e247 100644
--- a/app/Models/Meetup.php
+++ b/app/Models/Meetup.php
@@ -272,8 +272,8 @@ class Meetup extends Model implements HasMedia
                 'location' => $nextEvent->location,
                 'description' => $nextEvent->description,
                 'link' => $nextEvent->link,
-                'attendees' => count($nextEvent->attendees ?? []),
-                'might_attendees' => count($nextEvent->might_attendees ?? []),
+                'attendees' => $nextEvent->attendeesCount(),
+                'might_attendees' => $nextEvent->mightAttendeesCount(),
                 'nostr_note' => str($nextEvent->nostr_status)->after('Sent event ')->before(' to '),
             ] : null,
         );
diff --git a/app/Models/MeetupEvent.php b/app/Models/MeetupEvent.php
index 1cff8c6..a954d5f 100644
--- a/app/Models/MeetupEvent.php
+++ b/app/Models/MeetupEvent.php
@@ -65,6 +65,19 @@ class MeetupEvent extends Model
         return $this->belongsTo(Meetup::class);
     }
 
+    /**
+     * Anzahl der Zusagen bzw. Vielleicht-Sagen (die Listen sind JSON-Arrays).
+     */
+    public function attendeesCount(): int
+    {
+        return count($this->attendees ?? []);
+    }
+
+    public function mightAttendeesCount(): int
+    {
+        return count($this->might_attendees ?? []);
+    }
+
     /**
      * Eindeutige Kennung eines angemeldeten Nutzers in den Teilnehmer-Listen.
      * Einträge werden als `id_<userId>|<name>` abgelegt; der angehängte Pipe
diff --git a/tests/Feature/Api/MeetupApiTest.php b/tests/Feature/Api/MeetupApiTest.php
index 8bb751c..79c9ef3 100644
--- a/tests/Feature/Api/MeetupApiTest.php
+++ b/tests/Feature/Api/MeetupApiTest.php
@@ -80,7 +80,9 @@ it('returns meetup events as JSON on GET /api/meetup-events', function () {
 
     $response = $this->getJson('/api/meetup-events');
 
-    $response->assertSuccessful();
+    $response->assertSuccessful()
+        // id + Zähler werden für das RSVP im mobilen Slide-In gebraucht.
+        ->assertJsonStructure([['id', 'start', 'attendees', 'might_attendees', 'meetup.name']]);
     expect($response->json())->toBeArray()->not->toBeEmpty();
 });