diff --git a/api/config/config.php b/api/config/config.php
index ae816f3..ff3123d 100644
--- a/api/config/config.php
+++ b/api/config/config.php
@@ -70,10 +70,13 @@ return [
     'modules' => [
         'authserver' => [
             'class' => api\modules\authserver\Module::class,
-            'baseDomain' => getenv('AUTHSERVER_HOST'),
+            'host' => $params['authserverHost'],
         ],
         'session' => [
             'class' => api\modules\session\Module::class,
         ],
+        'mojang' => [
+            'class' => api\modules\mojang\Module::class,
+        ],
     ],
 ];
diff --git a/api/config/routes.php b/api/config/routes.php
index 6dec26d..7ff19d2 100644
--- a/api/config/routes.php
+++ b/api/config/routes.php
@@ -1,4 +1,7 @@
 <?php
+/**
+ * @var array $params
+ */
 return [
     '/accounts/change-email/initialize' => 'accounts/change-email-initialize',
     '/accounts/change-email/submit-new-email' => 'accounts/change-email-submit-new-email',
@@ -13,4 +16,12 @@ return [
     '/minecraft/session/hasJoined' => 'session/session/has-joined',
     '/minecraft/session/legacy/hasJoined' => 'session/session/has-joined-legacy',
     '/minecraft/session/profile/<uuid>' => 'session/session/profile',
+
+    '/mojang/profiles/<username>' => 'mojang/api/uuid-by-username',
+    '/mojang/profiles/<uuid>/names' => 'mojang/api/usernames-by-uuid',
+    'POST /mojang/profiles' => 'mojang/api/uuids-by-usernames',
+
+    "http://{$params['authserverHost']}/mojang/api/users/profiles/minecraft/<username>" => 'mojang/api/uuid-by-username',
+    "http://{$params['authserverHost']}/mojang/api/user/profiles/<uuid>/names" => 'mojang/api/usernames-by-uuid',
+    "POST http://{$params['authserverHost']}/mojang/api/profiles/minecraft" => 'mojang/api/uuids-by-usernames',
 ];
diff --git a/api/models/authentication/RegistrationForm.php b/api/models/authentication/RegistrationForm.php
index 8122c4d..1dfc3ea 100644
--- a/api/models/authentication/RegistrationForm.php
+++ b/api/models/authentication/RegistrationForm.php
@@ -9,6 +9,7 @@ use common\components\UserFriendlyRandomKey;
 use common\models\Account;
 use common\models\confirmations\RegistrationConfirmation;
 use common\models\EmailActivation;
+use common\models\UsernameHistory;
 use common\validators\LanguageValidator;
 use common\validators\PasswordValidate;
 use Ely\Email\Renderer;
@@ -108,6 +109,14 @@ class RegistrationForm extends ApiForm {
                 throw new ErrorException('Unable save email-activation model.');
             }
 
+            $usernamesHistory = new UsernameHistory();
+            $usernamesHistory->account_id = $account->id;
+            $usernamesHistory->username = $account->username;
+            $usernamesHistory->applied_in = $account->created_at;
+            if (!$usernamesHistory->save()) {
+                throw new ErrorException('Cannot save username history record');
+            }
+
             $this->sendMail($emailActivation, $account);
 
             $changeUsernameForm = new ChangeUsernameForm();
diff --git a/api/modules/authserver/Module.php b/api/modules/authserver/Module.php
index d8bcc11..1a4a5e2 100644
--- a/api/modules/authserver/Module.php
+++ b/api/modules/authserver/Module.php
@@ -15,11 +15,11 @@ class Module extends \yii\base\Module implements BootstrapInterface {
     /**
      * @var string базовый домен, запросы на который этот модуль должен обрабатывать
      */
-    public $baseDomain = 'https://authserver.ely.by';
+    public $host = 'authserver.ely.by';
 
     public function init() {
         parent::init();
-        if ($this->baseDomain === null) {
+        if ($this->host === null) {
             throw new InvalidConfigException('base domain must be specified');
         }
     }
@@ -39,7 +39,7 @@ class Module extends \yii\base\Module implements BootstrapInterface {
      */
     public function bootstrap($app) {
         $app->getUrlManager()->addRules([
-            $this->baseDomain . '/' . $this->id . '/auth/<action>' => $this->id . '/authentication/<action>',
+            "http://$this->host/$this->id/auth/<action>" => "$this->id/authentication/<action>",
         ], false);
     }
 
@@ -59,7 +59,7 @@ class Module extends \yii\base\Module implements BootstrapInterface {
      * @throws NotFoundHttpException
      */
     protected function checkHost() {
-        if (Yii::$app->request->getHostInfo() !== $this->baseDomain) {
+        if (parse_url(Yii::$app->request->getHostInfo(), PHP_URL_HOST) !== $this->host) {
             throw new NotFoundHttpException();
         }
     }
diff --git a/api/modules/mojang/Module.php b/api/modules/mojang/Module.php
new file mode 100644
index 0000000..9306443
--- /dev/null
+++ b/api/modules/mojang/Module.php
@@ -0,0 +1,10 @@
+<?php
+namespace api\modules\mojang;
+
+class Module extends \yii\base\Module {
+
+    public $id = 'mojang';
+
+    public $defaultRoute = 'api';
+
+}
diff --git a/api/modules/mojang/controllers/ApiController.php b/api/modules/mojang/controllers/ApiController.php
new file mode 100644
index 0000000..53967df
--- /dev/null
+++ b/api/modules/mojang/controllers/ApiController.php
@@ -0,0 +1,145 @@
+<?php
+namespace api\modules\mojang\controllers;
+
+use api\controllers\Controller;
+use common\models\Account;
+use common\models\UsernameHistory;
+use Ramsey\Uuid\Uuid;
+use Yii;
+use yii\web\Response;
+
+class ApiController extends Controller {
+
+    public function behaviors() {
+        $behaviors = parent::behaviors();
+        unset($behaviors['authenticator']);
+
+        return $behaviors;
+    }
+
+    public function actionUuidByUsername($username, $at = null) {
+        if ($at !== null) {
+            /** @var UsernameHistory|null $record */
+            $record = UsernameHistory::find()
+                ->andWhere(['username' => $username])
+                ->orderBy(['applied_in' => SORT_DESC])
+                ->andWhere(['<=', 'applied_in', $at])
+                ->one();
+
+            // Запрос выше находит просто последний случай использования, не учитывая то, что ник
+            // мог быть сменён с тех пор. Поэтому дополнительно проводим проверку, чтобы ник находился
+            // в каком-либо периоде (т.е. существовала последующая запись) или последний использовавший
+            // ник пользователь не сменил его на нечто иное
+            $account = null;
+            if ($record !== null) {
+                if ($record->findNext($at) !== null || $record->account->username === $record->username) {
+                    $account = $record->account;
+                }
+            }
+        } else {
+            /** @var Account|null $record */
+            $account = Account::findOne(['username' => $username]);
+        }
+
+        if ($account === null) {
+            return $this->noContentResponse();
+        }
+
+        return [
+            'id' => str_replace('-', '', $account->uuid),
+            'name' => $account->username,
+        ];
+    }
+
+    public function actionUsernamesByUuid($uuid) {
+        try {
+            $uuid = Uuid::fromString($uuid)->toString();
+        } catch(\InvalidArgumentException $e) {
+            return $this->illegalArgumentResponse('Invalid uuid format.');
+        }
+
+        $account = Account::findOne(['uuid' => $uuid]);
+        if ($account === null) {
+            return $this->noContentResponse();
+        }
+
+        /** @var UsernameHistory[] $usernameHistory */
+        $usernameHistory = $account->getUsernameHistory()
+            ->orderBy(['applied_in' => SORT_ASC])
+            ->all();
+
+        $data = [];
+        foreach($usernameHistory as $record) {
+            $data[] = [
+                'name' => $record->username,
+                'changedToAt' => $record->applied_in * 1000,
+            ];
+        }
+
+        // У первого элемента не должно быть времени, когда он был применён
+        // Хотя мы в принципе эту инфу знаем. А вот Mojang, вероятно, нет
+        unset($data[0]['changedToAt']);
+
+        return $data;
+    }
+
+    public function actionUuidsByUsernames() {
+        $usernames = Yii::$app->request->post();
+        if (empty($usernames)) {
+            $usernames = json_decode(Yii::$app->request->getRawBody());
+            if (empty($usernames)) {
+                return $this->illegalArgumentResponse('Passed array of profile names is an invalid JSON string.');
+            }
+        }
+
+        $usernames = array_unique($usernames);
+        if (count($usernames) > 100) {
+            return $this->illegalArgumentResponse('Not more that 100 profile name per call is allowed.');
+        }
+
+        foreach($usernames as $username) {
+            if (empty($username) || is_array($username)) {
+                return $this->illegalArgumentResponse('profileName can not be null, empty or array key.');
+            }
+        }
+
+        /** @var Account[] $accounts */
+        $accounts = Account::find()
+            ->andWhere(['username' => $usernames])
+            ->orderBy(['username' => $usernames])
+            ->limit(count($usernames))
+            ->all();
+
+        $responseData = [];
+        foreach($accounts as $account) {
+            $responseData[] = [
+                'id' => str_replace('-', '', $account->uuid),
+                'name' => $account->username,
+            ];
+        }
+
+        return $responseData;
+    }
+
+    private function noContentResponse() {
+        $response = Yii::$app->getResponse();
+        $response->setStatusCode(204);
+        $response->format = Response::FORMAT_RAW;
+        $response->content = '';
+
+        return $response;
+    }
+
+    private function illegalArgumentResponse(string $errorMessage) {
+        $response = Yii::$app->getResponse();
+        $response->setStatusCode(400);
+        $response->format = Response::FORMAT_JSON;
+        $response->data = [
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => $errorMessage,
+        ];
+
+        return $response;
+    }
+
+}
diff --git a/common/config/config.php b/common/config/config.php
index 3df1fbb..92f07f9 100644
--- a/common/config/config.php
+++ b/common/config/config.php
@@ -12,6 +12,9 @@ return [
             'username' => getenv('MYSQL_USER'),
             'password' => getenv('MYSQL_PASSWORD'),
             'charset' => 'utf8',
+            'schemaMap' => [
+                'mysql' => common\db\mysql\Schema::class,
+            ],
         ],
         'mailer' => [
             'class' => yii\swiftmailer\Mailer::class,
diff --git a/common/db/mysql/QueryBuilder.php b/common/db/mysql/QueryBuilder.php
new file mode 100644
index 0000000..f467396
--- /dev/null
+++ b/common/db/mysql/QueryBuilder.php
@@ -0,0 +1,39 @@
+<?php
+namespace common\db\mysql;
+
+use yii\db\Expression;
+use yii\db\mysql\QueryBuilder as MysqlQueryBuilder;
+
+class QueryBuilder extends MysqlQueryBuilder {
+
+    public function buildOrderBy($columns) {
+        if (empty($columns)) {
+            return '';
+        }
+
+        $orders = [];
+        foreach($columns as $name => $direction) {
+            if ($direction instanceof Expression) {
+                $orders[] = $direction->expression;
+            } elseif (is_array($direction)) {
+                // This is new feature
+                if (empty($direction)) {
+                    continue;
+                }
+
+                $fieldValues = [];
+                foreach($direction as $fieldValue) {
+                    $fieldValues[] = $this->db->quoteValue($fieldValue);
+                }
+
+                $orders[] = 'FIELD(' . $this->db->quoteColumnName($name) . ',' . implode(',', $fieldValues) . ')';
+                // End of new feature
+            } else {
+                $orders[] = $this->db->quoteColumnName($name) . ($direction === SORT_DESC ? ' DESC' : '');
+            }
+        }
+
+        return 'ORDER BY ' . implode(', ', $orders);
+    }
+
+}
diff --git a/common/db/mysql/Schema.php b/common/db/mysql/Schema.php
new file mode 100644
index 0000000..301d828
--- /dev/null
+++ b/common/db/mysql/Schema.php
@@ -0,0 +1,12 @@
+<?php
+namespace common\db\mysql;
+
+use yii\db\mysql\Schema as MysqlSchema;
+
+class Schema extends MysqlSchema {
+
+    public function createQueryBuilder() {
+        return new QueryBuilder($this->db);
+    }
+
+}
diff --git a/common/models/UsernameHistory.php b/common/models/UsernameHistory.php
index c2f832f..720cc10 100644
--- a/common/models/UsernameHistory.php
+++ b/common/models/UsernameHistory.php
@@ -1,7 +1,6 @@
 <?php
 namespace common\models;
 
-use Yii;
 use yii\behaviors\TimestampBehavior;
 use yii\db\ActiveRecord;
 
@@ -42,4 +41,16 @@ class UsernameHistory extends ActiveRecord {
         return $this->hasOne(Account::class, ['id' => 'account_id']);
     }
 
+    /**
+     * @param int $afterTime
+     * @return UsernameHistory|null
+     */
+    public function findNext(int $afterTime = null) /*: ?UsernameHistory*/ {
+        return self::find()
+            ->andWhere(['account_id' => $this->account_id])
+            ->andWhere(['>', 'applied_in', $afterTime ?: $this->applied_in])
+            ->orderBy(['applied_in' => SORT_ASC])
+            ->one();
+    }
+
 }
diff --git a/console/migrations/m160919_170008_improve_username_history.php b/console/migrations/m160919_170008_improve_username_history.php
new file mode 100644
index 0000000..3d7b3f1
--- /dev/null
+++ b/console/migrations/m160919_170008_improve_username_history.php
@@ -0,0 +1,33 @@
+<?php
+
+use console\db\Migration;
+
+class m160919_170008_improve_username_history extends Migration {
+
+    public function safeUp() {
+        $this->execute('
+            INSERT INTO {{%usernames_history}} (account_id, username, applied_in)
+            SELECT id as account_id, username, created_at as applied_at
+              FROM {{%accounts}}
+        ');
+        $this->createIndex('applied_in', '{{%usernames_history}}', 'applied_in');
+        $this->createIndex('username', '{{%usernames_history}}', 'username');
+    }
+
+    public function safeDown() {
+        $this->dropIndex('applied_in', '{{%usernames_history}}');
+        $this->dropIndex('username', '{{%usernames_history}}');
+        $this->execute('
+            DELETE FROM {{%usernames_history}}
+            WHERE id IN (
+                SELECT t1.id
+                  FROM (
+                      SELECT id, MIN(applied_in)
+                        FROM {{%usernames_history}}
+                       GROUP BY account_id
+                  ) t1
+            )
+        ');
+    }
+
+}
diff --git a/docker/nginx/account.ely.by.conf.template b/docker/nginx/account.ely.by.conf.template
index 3670e88..03a4522 100644
--- a/docker/nginx/account.ely.by.conf.template
+++ b/docker/nginx/account.ely.by.conf.template
@@ -13,16 +13,24 @@ server {
     set $request_url $request_uri;
     set $host_with_uri '${host}${request_uri}';
 
-    if ($host_with_uri ~* '^${AUTHSERVER_HOST}/auth') {
+    rewrite_log on;
+    error_log /var/log/nginx/error.log debug;
+
+    if ($host_with_uri ~ '^${AUTHSERVER_HOST}/auth') {
         set $request_url '/api/authserver${request_uri}';
         rewrite ^/auth /api/authserver$uri last;
     }
 
-    if ($host_with_uri ~* '^${AUTHSERVER_HOST}/session') {
+    if ($host_with_uri ~ '^${AUTHSERVER_HOST}/session') {
         set $request_url '/api/minecraft${request_uri}';
         rewrite ^/session /api/minecraft$uri last;
     }
 
+    if ($host_with_uri ~ '^${AUTHSERVER_HOST}/api/(user|profiles)') {
+        set $request_url '/api/mojang${request_uri}';
+        rewrite ^/api/(user|profiles) /api/mojang$uri last;
+    }
+
     location / {
         alias $frontend_path;
         index index.html;
diff --git a/tests/codeception/api/_pages/MojangApiRoute.php b/tests/codeception/api/_pages/MojangApiRoute.php
new file mode 100644
index 0000000..edf95ac
--- /dev/null
+++ b/tests/codeception/api/_pages/MojangApiRoute.php
@@ -0,0 +1,27 @@
+<?php
+namespace tests\codeception\api\_pages;
+
+use yii\codeception\BasePage;
+
+/**
+ * @property \tests\codeception\api\FunctionalTester $actor
+ */
+class MojangApiRoute extends BasePage {
+
+    public function usernameToUuid($username, $at = null) {
+        $this->route = '/mojang/profiles/' . $username;
+        $params = $at === null ? [] : ['at' => $at];
+        $this->actor->sendGET($this->getUrl(), $params);
+    }
+
+    public function usernamesByUuid($uuid) {
+        $this->route = "/mojang/profiles/{$uuid}/names";
+        $this->actor->sendGET($this->getUrl());
+    }
+
+    public function uuidsByUsernames($uuids) {
+        $this->route = '/mojang/profiles';
+        $this->actor->sendPOST($this->getUrl(), $uuids);
+    }
+
+}
diff --git a/tests/codeception/api/functional/mojang/UsernameToUuidCest.php b/tests/codeception/api/functional/mojang/UsernameToUuidCest.php
new file mode 100644
index 0000000..d952f83
--- /dev/null
+++ b/tests/codeception/api/functional/mojang/UsernameToUuidCest.php
@@ -0,0 +1,67 @@
+<?php
+namespace tests\codeception\api\functional\authserver;
+
+use tests\codeception\api\_pages\MojangApiRoute;
+use tests\codeception\api\FunctionalTester;
+
+class UsernameToUuidCest {
+
+    /**
+     * @var MojangApiRoute
+     */
+    private $route;
+
+    public function _before(FunctionalTester $I) {
+        $this->route = new MojangApiRoute($I);
+    }
+
+    public function getUuidByUsername(FunctionalTester $I) {
+        $I->wantTo('get user uuid by his username');
+        $this->route->usernameToUuid('Admin');
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'id' => 'df936908b2e1544d96f82977ec213022',
+            'name' => 'Admin',
+        ]);
+    }
+
+    public function getUuidByUsernameAtMoment(FunctionalTester $I) {
+        $I->wantTo('get user uuid by his username at fixed moment');
+        $this->route->usernameToUuid('klik201', 1474404142);
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'id' => 'd6b3e93564664cb886dbb5df91ae6541',
+            'name' => 'klik202',
+        ]);
+    }
+
+    public function getUuidByUsernameAtWrongMoment(FunctionalTester $I) {
+        $I->wantTo('get 204 if passed once used, but changed username at moment, when it was changed');
+        $this->route->usernameToUuid('klik201', 1474404144);
+        $I->canSeeResponseCodeIs(204);
+        $I->canSeeResponseEquals('');
+    }
+
+    public function getUuidByUsernameWithoutMoment(FunctionalTester $I) {
+        $I->wantTo('get 204 if username not busy and not passed valid time mark, when it was busy');
+        $this->route->usernameToUuid('klik201');
+        $I->canSeeResponseCodeIs(204);
+        $I->canSeeResponseEquals('');
+    }
+
+    public function getUuidByWrongUsername(FunctionalTester $I) {
+        $I->wantTo('get user uuid by some wrong username');
+        $this->route->usernameToUuid('not-exists-user');
+        $I->canSeeResponseCodeIs(204);
+        $I->canSeeResponseEquals('');
+    }
+
+    public function nonPassedUsername(FunctionalTester $I) {
+        $I->wantTo('get 404 on not passed username');
+        $this->route->usernameToUuid('');
+        $I->canSeeResponseCodeIs(404);
+    }
+
+}
diff --git a/tests/codeception/api/functional/mojang/UsernamesToUuidsCest.php b/tests/codeception/api/functional/mojang/UsernamesToUuidsCest.php
new file mode 100644
index 0000000..caa42dd
--- /dev/null
+++ b/tests/codeception/api/functional/mojang/UsernamesToUuidsCest.php
@@ -0,0 +1,131 @@
+<?php
+namespace tests\codeception\api\functional\authserver;
+
+use tests\codeception\api\_pages\MojangApiRoute;
+use tests\codeception\api\FunctionalTester;
+
+class UsernamesToUuidsCest {
+
+    /**
+     * @var MojangApiRoute
+     */
+    private $route;
+
+    public function _before(FunctionalTester $I) {
+        $this->route = new MojangApiRoute($I);
+    }
+
+    public function geUuidByOneUsername(FunctionalTester $I) {
+        $I->wantTo('get uuid by one username');
+        $this->route->uuidsByUsernames(['Admin']);
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            [
+                'id' => 'df936908b2e1544d96f82977ec213022',
+                'name' => 'Admin',
+            ],
+        ]);
+    }
+
+    public function getUuidsByUsernames(FunctionalTester $I) {
+        $I->wantTo('get uuids by few usernames');
+        $this->route->uuidsByUsernames(['Admin', 'AccWithOldPassword', 'Notch']);
+        $this->validateFewValidUsernames($I);
+    }
+
+    public function getUuidsByUsernamesWithPostString(FunctionalTester $I) {
+        $I->wantTo('get uuids by few usernames');
+        $this->route->uuidsByUsernames(json_encode(['Admin', 'AccWithOldPassword', 'Notch']));
+        $this->validateFewValidUsernames($I);
+    }
+
+    public function getUuidsByPartialNonexistentUsernames(FunctionalTester $I) {
+        $I->wantTo('get uuids by few usernames and some nonexistent');
+        $this->route->uuidsByUsernames(['Admin', 'not-exists-user']);
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            [
+                'id' => 'df936908b2e1544d96f82977ec213022',
+                'name' => 'Admin',
+            ],
+        ]);
+    }
+
+    public function passAllNonexistentUsernames(FunctionalTester $I) {
+        $I->wantTo('get specific response when pass all nonexistent usernames');
+        $this->route->uuidsByUsernames(['not-exists-1', 'not-exists-2']);
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([]);
+    }
+
+    public function passTooManyUsernames(FunctionalTester $I) {
+        $I->wantTo('get specific response when pass too many usernames');
+        $usernames = [];
+        for($i = 0; $i < 150; $i++) {
+            $usernames[] = random_bytes(10);
+        }
+        $this->route->uuidsByUsernames($usernames);
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'Not more that 100 profile name per call is allowed.',
+        ]);
+    }
+
+    public function passEmptyUsername(FunctionalTester $I) {
+        $I->wantTo('get specific response when pass empty username');
+        $this->route->uuidsByUsernames(['Admin', '']);
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'profileName can not be null, empty or array key.',
+        ]);
+    }
+
+    public function passEmptyField(FunctionalTester $I) {
+        $I->wantTo('get response when pass empty array');
+        $this->route->uuidsByUsernames([]);
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'Passed array of profile names is an invalid JSON string.',
+        ]);
+    }
+
+    public function passWrongPostBody(FunctionalTester $I) {
+        $I->wantTo('get specific response when pass invalid json string');
+        $this->route->uuidsByUsernames('wrong-json');
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'Passed array of profile names is an invalid JSON string.',
+        ]);
+    }
+
+    private function validateFewValidUsernames(FunctionalTester $I) {
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            [
+                'id' => 'df936908b2e1544d96f82977ec213022',
+                'name' => 'Admin',
+            ],
+            [
+                'id' => 'bdc239f08a22518d8b93f02d4827c3eb',
+                'name' => 'AccWithOldPassword',
+            ],
+            [
+                'id' => '4aaf4f003b5b4d3692529e8ee0c86679',
+                'name' => 'Notch',
+            ],
+        ]);
+    }
+
+}
diff --git a/tests/codeception/api/functional/mojang/UuidToUsernamesHistoryCest.php b/tests/codeception/api/functional/mojang/UuidToUsernamesHistoryCest.php
new file mode 100644
index 0000000..ae98423
--- /dev/null
+++ b/tests/codeception/api/functional/mojang/UuidToUsernamesHistoryCest.php
@@ -0,0 +1,69 @@
+<?php
+namespace tests\codeception\api\functional\authserver;
+
+use Faker\Provider\Uuid;
+use tests\codeception\api\_pages\MojangApiRoute;
+use tests\codeception\api\FunctionalTester;
+
+class UuidToUsernamesHistoryCest {
+
+    /**
+     * @var MojangApiRoute
+     */
+    private $route;
+
+    public function _before(FunctionalTester $I) {
+        $this->route = new MojangApiRoute($I);
+    }
+
+    public function getUsernameByUuid(FunctionalTester $I) {
+        $I->wantTo('get usernames history by uuid for user, without history');
+        $this->route->usernamesByUuid('df936908b2e1544d96f82977ec213022');
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            [
+                'name' => 'Admin',
+            ],
+        ]);
+    }
+
+    public function getUsernameByUuidWithHistory(FunctionalTester $I) {
+        $I->wantTo('get usernames history by dashed uuid and expect history with time marks');
+        $this->route->usernamesByUuid('d6b3e935-6466-4cb8-86db-b5df91ae6541');
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            [
+                'name' => 'klik202',
+            ],
+            [
+                'name' => 'klik201',
+                'changedToAt' => 1474404141000,
+            ],
+            [
+                'name' => 'klik202',
+                'changedToAt' => 1474404143000,
+            ],
+        ]);
+    }
+
+    public function passWrongUuid(FunctionalTester $I) {
+        $I->wantTo('get user username by some wrong uuid');
+        $this->route->usernamesByUuid(Uuid::uuid());
+        $I->canSeeResponseCodeIs(204);
+        $I->canSeeResponseEquals('');
+    }
+
+    public function passWrongUuidFormat(FunctionalTester $I) {
+        $I->wantTo('call profile route with invalid uuid string');
+        $this->route->usernamesByUuid('bla-bla-bla');
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'Invalid uuid format.',
+        ]);
+    }
+
+}
diff --git a/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php b/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
index 6159731..0a1313f 100644
--- a/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
+++ b/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
@@ -6,6 +6,7 @@ use api\models\authentication\RegistrationForm;
 use Codeception\Specify;
 use common\models\Account;
 use common\models\EmailActivation;
+use common\models\UsernameHistory;
 use tests\codeception\api\unit\DbTestCase;
 use tests\codeception\common\fixtures\AccountFixture;
 use Yii;
@@ -118,6 +119,11 @@ class RegistrationFormTest extends DbTestCase {
             'account_id' => $account->id,
             'type' => EmailActivation::TYPE_REGISTRATION_EMAIL_CONFIRMATION,
         ])->exists())->true();
+        expect('username history record exists in database', UsernameHistory::find()->andWhere([
+            'username' => $account->username,
+            'account_id' => $account->id,
+            'applied_in' => $account->created_at,
+        ])->exists())->true();
         expect_file('message file exists', $this->getMessageFile())->exists();
     }
 
diff --git a/tests/codeception/common/fixtures/data/accounts.php b/tests/codeception/common/fixtures/data/accounts.php
index 00bf8f9..33db104 100644
--- a/tests/codeception/common/fixtures/data/accounts.php
+++ b/tests/codeception/common/fixtures/data/accounts.php
@@ -133,4 +133,17 @@ return [
         'created_at' => 1472682343,
         'updated_at' => 1472682343,
     ],
+    'account-with-usernames-history' => [
+        'id' => 11,
+        'uuid' => 'd6b3e935-6466-4cb8-86db-b5df91ae6541',
+        'username' => 'klik202',
+        'email' => 'klik202@mail.ru',
+        'password_hash' => '$2y$13$2rYkap5T6jG8z/mMK8a3Ou6aZxJcmAaTha6FEuujvHEmybSHRzW5e', # password_0
+        'password_hash_strategy' => \common\models\Account::PASS_HASH_STRATEGY_YII2,
+        'lang' => 'ru',
+        'status' => \common\models\Account::STATUS_ACTIVE,
+        'rules_agreement_version' => \common\LATEST_RULES_VERSION,
+        'created_at' => 1474404139,
+        'updated_at' => 1474404149,
+    ],
 ];
diff --git a/tests/codeception/common/fixtures/data/usernames-history.php b/tests/codeception/common/fixtures/data/usernames-history.php
index bee73cf..26de303 100644
--- a/tests/codeception/common/fixtures/data/usernames-history.php
+++ b/tests/codeception/common/fixtures/data/usernames-history.php
@@ -1,4 +1,27 @@
 <?php
 return [
-
+    [
+        'id' => 1,
+        'username' => 'Admin',
+        'account_id' => 1,
+        'applied_in' => 1451775316,
+    ],
+    [
+        'id' => 2,
+        'username' => 'klik202',
+        'account_id' => 11,
+        'applied_in' => 1474404139,
+    ],
+    [
+        'id' => 3,
+        'username' => 'klik201',
+        'account_id' => 11,
+        'applied_in' => 1474404141,
+    ],
+    [
+        'id' => 4,
+        'username' => 'klik202',
+        'account_id' => 11,
+        'applied_in' => 1474404143,
+    ],
 ];
diff --git a/tests/codeception/common/unit/db/mysql/QueryBuilderTest.php b/tests/codeception/common/unit/db/mysql/QueryBuilderTest.php
new file mode 100644
index 0000000..77a3d96
--- /dev/null
+++ b/tests/codeception/common/unit/db/mysql/QueryBuilderTest.php
@@ -0,0 +1,16 @@
+<?php
+namespace codeception\common\unit\db\mysql;
+
+use common\db\mysql\QueryBuilder;
+use tests\codeception\common\unit\TestCase;
+use Yii;
+
+class QueryBuilderTest extends TestCase {
+
+    public function testBuildOrderByField() {
+        $queryBuilder = new QueryBuilder(Yii::$app->db);
+        $result = $queryBuilder->buildOrderBy(['dummy' => ['first', 'second']]);
+        $this->assertEquals("ORDER BY FIELD(`dummy`,'first','second')", $result);
+    }
+
+}
diff --git a/tests/codeception/config/api/config.php b/tests/codeception/config/api/config.php
index ff84813..eb1ccbb 100644
--- a/tests/codeception/config/api/config.php
+++ b/tests/codeception/config/api/config.php
@@ -11,7 +11,7 @@ return [
     ],
     'modules' => [
         'authserver' => [
-            'baseDomain' => 'http://localhost',
+            'host' => 'localhost',
         ],
     ],
     'params' => [