diff --git a/composer.json b/composer.json
index c101081..c6db7b4 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,8 @@
     "autoload": {
         "psr-4": {
             "App\\": "src/"
-        }
+        },
+        "files": ["./src/Functions/index.php"]
     },
     "autoload-dev": {
         "psr-4": {
diff --git a/config/services.yaml b/config/services.yaml
index 78fc17e..e1787fc 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -23,7 +23,7 @@ services:
     # this creates a service per class whose id is the fully-qualified class name
     App\:
         resource: '../src/*'
-        exclude: '../src/{DependencyInjection,Entity,Model,Migrations,Tests,Kernel.php}'
+        exclude: '../src/{DependencyInjection,Entity,Model,Migrations,Tests,Functions,Kernel.php}'
 
     # controllers are imported separately to make sure services can be injected
     # as action arguments even if you don't extend any base controller class
diff --git a/src/Controller/Api/v1/TracksController.php b/src/Controller/Api/v1/TracksController.php
new file mode 100644
index 0000000..e054679
--- /dev/null
+++ b/src/Controller/Api/v1/TracksController.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Controller\Api\v1;
+
+use App\Controller\Controller;
+use App\Provider\TrackRepository;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use function App\Functions\encapsulate;
+
+/**
+ * @Route("/tracks")
+ */
+class TracksController extends Controller
+{
+    /**
+     * @Route("/")
+     */
+    public function index(Request $request, TrackRepository $repository)
+    {
+        switch (true) {
+            case $request->query->has('stop'):
+                return $this->byStop($request, $repository);
+            case $request->query->has('line'):
+                return $this->byLine($request, $repository);
+            case $request->query->has('id'):
+                return $this->byId($request, $repository);
+            default:
+                throw new BadRequestHttpException(sprintf('At least one parameter of %s must be set.', implode(', ', ['stop', 'line', 'id'])));
+        }
+    }
+
+    private function byId(Request $request, TrackRepository $repository)
+    {
+        $id = encapsulate($request->query->get('id'));
+
+        return $this->json($repository->getManyById($id));
+    }
+
+    private function byStop(Request $request, TrackRepository $repository)
+    {
+        $stop = encapsulate($request->query->get('stop'));
+
+        return $this->json($repository->getByStop($stop));
+    }
+
+    private function byLine(Request $request, TrackRepository $repository)
+    {
+        $line = encapsulate($request->query->get('line'));
+
+        return $this->json($repository->getByLine($line));
+    }
+}
\ No newline at end of file
diff --git a/src/Functions/helpers.php b/src/Functions/helpers.php
new file mode 100644
index 0000000..46f1c7a
--- /dev/null
+++ b/src/Functions/helpers.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Functions;
+
+function encapsulate($value)
+{
+    switch (true) {
+        case is_array($value):
+            return $value;
+        case is_iterable($value):
+            return iterator_to_array($value);
+        default:
+            return [ $value ];
+    }
+}
\ No newline at end of file
diff --git a/src/Functions/index.php b/src/Functions/index.php
new file mode 100644
index 0000000..a0028ce
--- /dev/null
+++ b/src/Functions/index.php
@@ -0,0 +1,3 @@
+<?php
+
+require_once __DIR__ . '/helpers.php';
\ No newline at end of file
diff --git a/src/Provider/Database/GenericTrackRepository.php b/src/Provider/Database/GenericTrackRepository.php
index 1047093..d13bd19 100644
--- a/src/Provider/Database/GenericTrackRepository.php
+++ b/src/Provider/Database/GenericTrackRepository.php
@@ -6,6 +6,8 @@ use App\Entity\LineEntity;
 use App\Entity\StopEntity;
 use App\Entity\StopInTrack;
 use App\Entity\TrackEntity;
+use function App\Functions\encapsulate;
+use App\Model\Stop;
 use App\Model\Track;
 use App\Provider\TrackRepository;
 use Tightenco\Collect\Support\Collection;
@@ -32,13 +34,16 @@ class GenericTrackRepository extends DatabaseRepository implements TrackReposito
 
     public function getByStop($stop): Collection
     {
+        $reference = f\apply(f\ref([$this, 'reference']), StopEntity::class);
+        $stop      = array_map([Stop::class, 'reference'], encapsulate($stop));
+
         $tracks = $this->em->createQueryBuilder()
             ->from(StopInTrack::class, 'st')
             ->join('st.track', 't')
-            ->where('st.stop = :stop')
+            ->where('st.stop in (:stop)')
             ->select(['st', 't'])
             ->getQuery()
-            ->execute(['stop' => $this->reference(StopEntity::class, $stop)]);
+            ->execute(['stop' => array_map($reference, $stop)]);
 
         return collect($tracks)->map(function (StopInTrack $entity) {
             return [ $this->convert($entity->getTrack()), $entity->getOrder() ];
@@ -47,14 +52,17 @@ class GenericTrackRepository extends DatabaseRepository implements TrackReposito
 
     public function getByLine($line): Collection
     {
+        $reference = f\apply(f\ref([$this, 'reference']), LineEntity::class);
+        $line      = array_map([Stop::class, 'reference'], encapsulate($line));
+
         $tracks = $this->em->createQueryBuilder()
             ->from(StopInTrack::class, 'st')
             ->join('st.track', 't')
             ->join('t.stops', 's')
-            ->where('st.line = :line')
+            ->where('st.line in (:line)')
             ->select(['st', 't', 's'])
             ->getQuery()
-            ->execute(['stop' => $this->reference(LineEntity::class, $line)]);
+            ->execute(['stop' => array_map($reference, $line)]);
 
         return collect($tracks)->map(f\ref([$this, 'convert']));
     }