diff --git a/common/components/Mojang/Api.php b/common/components/Mojang/Api.php
new file mode 100644
index 0000000..70e253d
--- /dev/null
+++ b/common/components/Mojang/Api.php
@@ -0,0 +1,49 @@
+<?php
+namespace common\components\Mojang;
+
+use common\components\Mojang\exceptions\MojangApiException;
+use common\components\Mojang\exceptions\NoContentException;
+use common\components\Mojang\response\UsernameToUUIDResponse;
+use GuzzleHttp\Client as GuzzleClient;
+
+class Api {
+
+    /**
+     * @param string $username
+     * @param int    $atTime
+     *
+     * @return UsernameToUUIDResponse
+     * @throws MojangApiException
+     * @throws NoContentException
+     */
+    public function usernameToUUID($username, $atTime = null) {
+        $client = $this->createClient();
+        $request = $client->createRequest('GET', 'https://api.mojang.com/users/profiles/minecraft/' . $username);
+        $queryParams = [];
+        if ($atTime !== null) {
+            $queryParams['atTime'] = $atTime;
+        }
+
+        $request->setQuery($queryParams);
+        $response = $client->send($request);
+        if ($response->getStatusCode() === 204) {
+            throw new NoContentException('Username not found');
+        } elseif ($response->getStatusCode()) {
+            throw new MojangApiException('Unexpected request result');
+        }
+
+        $data = $response->json(['object' => false]);
+        $responseObj = new UsernameToUUIDResponse();
+        $responseObj->id = $data['id'];
+        $responseObj->name = $data['name'];
+        $responseObj->legacy = isset($data['legacy']);
+        $responseObj->demo = isset($data['demo']);
+
+        return $responseObj;
+    }
+
+    protected function createClient() {
+        return new GuzzleClient();
+    }
+
+}
diff --git a/common/components/Mojang/exceptions/MojangApiException.php b/common/components/Mojang/exceptions/MojangApiException.php
new file mode 100644
index 0000000..954f76d
--- /dev/null
+++ b/common/components/Mojang/exceptions/MojangApiException.php
@@ -0,0 +1,8 @@
+<?php
+namespace common\components\Mojang\exceptions;
+
+use Exception;
+
+class MojangApiException extends Exception {
+
+}
diff --git a/common/components/Mojang/exceptions/NoContentException.php b/common/components/Mojang/exceptions/NoContentException.php
new file mode 100644
index 0000000..6fb08d3
--- /dev/null
+++ b/common/components/Mojang/exceptions/NoContentException.php
@@ -0,0 +1,6 @@
+<?php
+namespace common\components\Mojang\exceptions;
+
+class NoContentException extends MojangApiException {
+
+}
diff --git a/common/components/Mojang/response/UsernameToUUIDResponse.php b/common/components/Mojang/response/UsernameToUUIDResponse.php
new file mode 100644
index 0000000..de7dc9a
--- /dev/null
+++ b/common/components/Mojang/response/UsernameToUUIDResponse.php
@@ -0,0 +1,29 @@
+<?php
+namespace common\components\Mojang\response;
+
+/**
+ * http://wiki.vg/Mojang_API#Username_-.3E_UUID_at_time
+ */
+class UsernameToUUIDResponse {
+
+    /**
+     * @var string uuid пользователя без разделения на дефисы
+     */
+    public $id;
+
+    /**
+     * @var string ник пользователя в настоящем времени
+     */
+    public $name;
+
+    /**
+     * @var bool если имеет значение true, то значит аккаунт не мигрирован в Mojang аккаунт
+     */
+    public $legacy = false;
+
+    /**
+     * @var bool будет иметь значение true, если аккаунт находится в демо-режиме (не приобретена лицензия)
+     */
+    public $demo = false;
+
+}
diff --git a/composer.json b/composer.json
index 1efe3e9..5b5ab15 100644
--- a/composer.json
+++ b/composer.json
@@ -15,13 +15,14 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=5.6.0",
-        "yiisoft/yii2": ">=2.0.6",
+        "yiisoft/yii2": "~2.0.6",
         "yiisoft/yii2-bootstrap": "*",
         "yiisoft/yii2-swiftmailer": "*",
-        "ramsey/uuid": "^3.1",
+        "ramsey/uuid": "~3.1",
         "league/oauth2-server": "~4.1.5",
         "yiisoft/yii2-redis": "~2.0.0",
-        "damirka/yii2-jwt": "dev-master#be29a5b5d7e7d146c13d4374788e02c54cc04138"
+        "damirka/yii2-jwt": "dev-master#be29a5b5d7e7d146c13d4374788e02c54cc04138",
+        "guzzlehttp/guzzle": "~5.3.0"
     },
     "require-dev": {
         "yiisoft/yii2-codeception": "*",