diff --git a/application/Espo/Controllers/Action.php b/application/Espo/Core/Action/Api/PostProcess.php
similarity index 79%
rename from application/Espo/Controllers/Action.php
rename to application/Espo/Core/Action/Api/PostProcess.php
index e34a17a19d..7df97c4b0c 100644
--- a/application/Espo/Controllers/Action.php
+++ b/application/Espo/Core/Action/Api/PostProcess.php
@@ -27,29 +27,24 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Controllers;
+namespace Espo\Core\Action\Api;
 
-use Espo\Core\{
-    Exceptions\BadRequest,
-    Action\Service,
-    Api\Request,
-};
-
-use stdClass;
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Action\Service;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
 
 /**
- * Action framework.
+ * Processes actions.
  */
-class Action
+class PostProcess implements Action
 {
-    private $service;
+    public function __construct(private Service $service)
+    {}
 
-    public function __construct(Service $service)
-    {
-        $this->service = $service;
-    }
-
-    public function postActionProcess(Request $request): stdClass
+    public function process(Request $request): Response
     {
         $body = $request->getParsedBody();
 
@@ -64,6 +59,6 @@ class Action
 
         $entity = $this->service->process($entityType, $action, $id, $data);
 
-        return $entity->getValueMap();
+        return ResponseComposer::json($entity->getValueMap());
     }
 }
diff --git a/application/Espo/Core/MassAction/Api/GetStatus.php b/application/Espo/Core/MassAction/Api/GetStatus.php
new file mode 100644
index 0000000000..160fcbadb4
--- /dev/null
+++ b/application/Espo/Core/MassAction/Api/GetStatus.php
@@ -0,0 +1,56 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\MassAction\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\MassAction\Service;
+
+class GetStatus implements Action
+{
+    public function __construct(private Service $service)
+    {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id');
+
+        if (!$id) {
+            throw new BadRequest();
+        }
+
+        $result = $this->service->getStatusData($id);
+
+        return ResponseComposer::json($result);
+    }
+}
diff --git a/application/Espo/Controllers/MassAction.php b/application/Espo/Core/MassAction/Api/PostProcess.php
similarity index 77%
rename from application/Espo/Controllers/MassAction.php
rename to application/Espo/Core/MassAction/Api/PostProcess.php
index eb91cd448b..e9ee1f08ff 100644
--- a/application/Espo/Controllers/MassAction.php
+++ b/application/Espo/Core/MassAction/Api/PostProcess.php
@@ -27,37 +27,31 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Controllers;
-
-use Espo\Core\Exceptions\BadRequest;
-use Espo\Core\Exceptions\Error;
-
-use Espo\Core\MassAction\Service;
-use Espo\Core\MassAction\ServiceResult;
-use Espo\Core\MassAction\Params;
-use Espo\Core\MassAction\ServiceParams;
+namespace Espo\Core\MassAction\Api;
 
+use Espo\Core\Api\Action;
 use Espo\Core\Api\Request;
 use Espo\Core\Api\Response;
-
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Exceptions\Error;
+use Espo\Core\MassAction\Params;
+use Espo\Core\MassAction\Service;
+use Espo\Core\MassAction\ServiceParams;
+use Espo\Core\MassAction\ServiceResult;
 use Espo\Core\Utils\Json;
-
-use stdClass;
 use RuntimeException;
+use stdClass;
 
 /**
- * Mass-Action framework.
+ * Processes mass actions.
  */
-class MassAction
+class PostProcess implements Action
 {
-    private $service;
+    public function __construct(private Service $service)
+    {}
 
-    public function __construct(Service $service)
-    {
-        $this->service = $service;
-    }
-
-    public function postActionProcess(Request $request): stdClass
+    public function process(Request $request): Response
     {
         $body = $request->getParsedBody();
 
@@ -90,35 +84,13 @@ class MassAction
             $data
         );
 
-        return $this->convertResult($result);
-    }
+        $result = $this->convertResult($result);
 
-    public function getActionStatus(Request $request): stdClass
-    {
-        $id = $request->getQueryParam('id');
-
-        if (!$id) {
-            throw new BadRequest();
-        }
-
-        return $this->service->getStatusData($id);
-    }
-
-    public function postActionSubscribeToNotificationOnSuccess(Request $request, Response $response): void
-    {
-        $id = $request->getParsedBody()->id ?? null;
-
-        if (!$id || !is_string($id)) {
-            throw new BadRequest();
-        }
-
-        $this->service->subscribeToNotificationOnSuccess($id);
-
-        $response->writeBody('true');
+        return ResponseComposer::json($result);
     }
 
     /**
-     * @return array<string,mixed>
+     * @return array<string, mixed>
      * @throws BadRequest
      */
     private function prepareMassActionParams(stdClass $data): array
@@ -141,13 +113,11 @@ class MassAction
             return $params;
         }
 
-        if (!is_null($ids)) {
-            return [
-                'ids' => $ids,
-            ];
+        if (is_null($ids)) {
+            throw new BadRequest("Bad search params for mass action.");
         }
 
-        throw new BadRequest("Bad search params for mass action.");
+        return ['ids' => $ids];
     }
 
     /**
diff --git a/application/Espo/Core/MassAction/Api/PostSubscribe.php b/application/Espo/Core/MassAction/Api/PostSubscribe.php
new file mode 100644
index 0000000000..6efeddc93c
--- /dev/null
+++ b/application/Espo/Core/MassAction/Api/PostSubscribe.php
@@ -0,0 +1,56 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\MassAction\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\MassAction\Service;
+
+class PostSubscribe implements Action
+{
+    public function __construct(private Service $service)
+    {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id');
+
+        if (!$id) {
+            throw new BadRequest();
+        }
+
+        $this->service->subscribeToNotificationOnSuccess($id);
+
+        return ResponseComposer::json(true);
+    }
+}
diff --git a/application/Espo/Resources/routes.json b/application/Espo/Resources/routes.json
index 259c9df504..b9143fcd78 100644
--- a/application/Espo/Resources/routes.json
+++ b/application/Espo/Resources/routes.json
@@ -228,29 +228,35 @@
             "name": ":name"
         }
     },
+    {
+        "route": "/CurrencyRate",
+        "method": "get",
+        "actionClassName": "Espo\\Tools\\Currency\\Api\\Get"
+    },
     {
         "route": "/CurrencyRate",
         "method": "put",
-        "params": {
-            "controller": "CurrencyRate",
-            "action": "update"
-        }
+        "actionClassName": "Espo\\Tools\\Currency\\Api\\PutUpdate"
     },
     {
         "route": "/Action",
         "method": "post",
-        "params": {
-            "controller": "Action",
-            "action": "process"
-        }
+        "actionClassName": "Espo\\Core\\Action\\Api\\PostProcess"
     },
     {
         "route": "/MassAction",
         "method": "post",
-        "params": {
-            "controller": "MassAction",
-            "action": "process"
-        }
+        "actionClassName": "Espo\\Core\\MassAction\\Api\\PostProcess"
+    },
+    {
+        "route": "/MassAction/:id/status",
+        "method": "get",
+        "actionClassName": "Espo\\Core\\MassAction\\Api\\GetStatus"
+    },
+    {
+        "route": "/MassAction/:id/subscribe",
+        "method": "post",
+        "actionClassName": "Espo\\Core\\MassAction\\Api\\PostSubscribe"
     },
     {
         "route": "/Export",
diff --git a/application/Espo/Tools/Currency/Api/Get.php b/application/Espo/Tools/Currency/Api/Get.php
new file mode 100644
index 0000000000..4091e7d0fa
--- /dev/null
+++ b/application/Espo/Tools/Currency/Api/Get.php
@@ -0,0 +1,52 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Currency\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Tools\Currency\RateService as Service;
+
+/**
+ * Gets rates.
+ */
+class Get implements Action
+{
+    public function __construct(private Service $service)
+    {}
+
+    public function process(Request $request): Response
+    {
+        $result = $this->service->get()->toAssoc();
+
+        return ResponseComposer::json($result);
+    }
+}
diff --git a/application/Espo/Controllers/CurrencyRate.php b/application/Espo/Tools/Currency/Api/PutUpdate.php
similarity index 79%
rename from application/Espo/Controllers/CurrencyRate.php
rename to application/Espo/Tools/Currency/Api/PutUpdate.php
index ed5d4c01b1..ef205f9fe7 100644
--- a/application/Espo/Controllers/CurrencyRate.php
+++ b/application/Espo/Tools/Currency/Api/PutUpdate.php
@@ -27,33 +27,24 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Controllers;
+namespace Espo\Tools\Currency\Api;
 
-use Espo\Core\Currency\Rates;
-use Espo\Core\Exceptions\BadRequest;
-use Espo\Core\Exceptions\Forbidden;
-use Espo\Tools\Currency\RateService as Service;
+use Espo\Core\Api\Action;
 use Espo\Core\Api\Request;
-use stdClass;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Currency\Rates;
+use Espo\Tools\Currency\RateService as Service;
 
-class CurrencyRate
+/**
+ * Updates rates.
+ */
+class PutUpdate implements Action
 {
     public function __construct(private Service $service)
     {}
 
-    /**
-     * @throws Forbidden
-     */
-    public function getActionIndex(): stdClass
-    {
-        return (object) $this->service->get()->toAssoc();
-    }
-
-    /**
-     * @throws BadRequest
-     * @throws Forbidden
-     */
-    public function putActionUpdate(Request $request): bool
+    public function process(Request $request): Response
     {
         $data = $request->getParsedBody();
 
@@ -61,6 +52,6 @@ class CurrencyRate
 
         $this->service->set($rates);
 
-        return true;
+        return ResponseComposer::json(true);
     }
 }
diff --git a/client/src/views/modals/mass-action.js b/client/src/views/modals/mass-action.js
index 8862e8d956..ae3a0f6c08 100644
--- a/client/src/views/modals/mass-action.js
+++ b/client/src/views/modals/mass-action.js
@@ -114,9 +114,7 @@ define('views/modals/mass-action', ['views/modal', 'model'], function (Dep, Mode
                     return;
                 }
 
-                Espo.Ajax.postRequest('MassAction/action/subscribeToNotificationOnSuccess', {
-                    id: this.id,
-                });
+                Espo.Ajax.postRequest(`MassAction/${this.id}/subscribe`);
             });
 
             this.checkStatus();
@@ -124,9 +122,7 @@ define('views/modals/mass-action', ['views/modal', 'model'], function (Dep, Mode
 
         checkStatus: function () {
             Espo.Ajax
-                .getRequest('MassAction/action/status', {
-                    id: this.id,
-                })
+                .getRequest(`MassAction/${this.id}/status`)
                 .then(response => {
                     let status = response.status;