diff --git a/app/Factories/LinkFactory.php b/app/Factories/LinkFactory.php
index 7ff2bda..9f3e504 100644
--- a/app/Factories/LinkFactory.php
+++ b/app/Factories/LinkFactory.php
@@ -9,7 +9,7 @@ use App\Helpers\LinkHelper;
 class LinkFactory {
     const MAXIMUM_LINK_LENGTH = 65535;
 
-    private static function formatLink($link_ending, $secret_ending=false) {
+    public static function formatLink($link_ending, $secret_ending=false) {
         /**
         * Given a link ending and a boolean indicating whether a secret ending is needed,
         * return a link formatted with app protocol, app address, and link ending.
diff --git a/app/Http/Controllers/Api/ApiLinkController.php b/app/Http/Controllers/Api/ApiLinkController.php
index b1f377c..1169c17 100644
--- a/app/Http/Controllers/Api/ApiLinkController.php
+++ b/app/Http/Controllers/Api/ApiLinkController.php
@@ -137,4 +137,29 @@ class ApiLinkController extends ApiController {
             throw new ApiException('NOT_FOUND', 'Link not found.', 404, $response_type);
         }
     }
+
+    public function findByLongLink(Request $request) {
+
+        $response_type = $request->input('response_type', 'json');
+        if ($response_type != 'json') {
+            throw new ApiException('JSON_ONLY', 'Only JSON-encoded responses are available for this endpoint.', 401, $response_type);
+        }
+
+        $long_url = urldecode(trim($request->input('long_url')));
+        if (empty($long_url)) {
+            throw new ApiException('MISSING_PARAMETERS', 'Invalid or missing parameters.', 400, $response_type);
+        }
+
+        $user = $request->user;
+
+        $short_url = LinkHelper::longLinkExists($long_url, $user->username);
+        if ($short_url) {
+            return self::encodeResponse([
+                'short_url' => LinkFactory::formatLink($short_url),
+                'long_url'  => $long_url
+            ], 'find_by_long', 'json');
+        } else {
+            throw new ApiException('NOT_FOUND', 'Link not found.', 404, $response_type);
+        }
+    }
 }
diff --git a/app/Http/routes.php b/app/Http/routes.php
index e936cb1..8598a74 100644
--- a/app/Http/routes.php
+++ b/app/Http/routes.php
@@ -72,6 +72,9 @@ $app->group(['prefix' => '/api/v2', 'namespace' => 'App\Http\Controllers\Api', '
     $app->post('action/lookup', ['as' => 'api_lookup_url', 'uses' => 'ApiLinkController@lookupLink']);
     $app->get('action/lookup', ['as' => 'api_lookup_url', 'uses' => 'ApiLinkController@lookupLink']);
 
+    /* API find long link endpoints */
+    $app->get('action/find_by_long', ['as' => 'api_find_by_long_url', 'uses' => 'ApiLinkController@findByLongLink']);
+
     /* API data endpoints */
     $app->get('data/link', ['as' => 'api_link_analytics', 'uses' => 'ApiAnalyticsController@lookupLinkStats']);
     $app->post('data/link', ['as' => 'api_link_analytics', 'uses' => 'ApiAnalyticsController@lookupLinkStats']);