diff --git a/doc/API-Mastodon.md b/doc/API-Mastodon.md
index 6bb17642da..85e23f525c 100644
--- a/doc/API-Mastodon.md
+++ b/doc/API-Mastodon.md
@@ -73,6 +73,7 @@ These endpoints use the [Mastodon API entities](https://docs.joinmastodon.org/en
 
 
 - [`GET /api/v1/instance`](https://docs.joinmastodon.org/methods/instance#fetch-instance)
+- GET /api/v1/instance/rules Undocumented, returns Terms of Service
 - [`GET /api/v1/instance/peers`](https://docs.joinmastodon.org/methods/instance#list-of-connected-domains)
 - [`GET /api/v1/lists`](https://docs.joinmastodon.org/methods/timelines/lists/)
 - [`POST /api/v1/lists`](https://docs.joinmastodon.org/methods/timelines/lists/)
@@ -140,7 +141,9 @@ They refer to features that don't exist in Friendica yet.
 These endpoints won't be implemented at the moment.
 They refer to features or data that don't exist in Friendica yet.
 
+- POST /api/meta Misskey API endpoint.
 - [`POST /api/v1/accounts`](https://docs.joinmastodon.org/methods/accounts/)
+- [`GET /api/v1/accounts/:id/featured_tags`](https://docs.joinmastodon.org/methods/accounts/)
 - [`POST /api/v1/accounts/:id/pin`](https://docs.joinmastodon.org/methods/accounts/)
 - [`POST /api/v1/accounts/:id/unpin`](https://docs.joinmastodon.org/methods/accounts/)
 - [`GET /api/v1/admin/accounts`](https://docs.joinmastodon.org/methods/admin/)
@@ -167,8 +170,13 @@ They refer to features or data that don't exist in Friendica yet.
 - [`POST /api/v1/markers`](https://docs.joinmastodon.org/methods/timelines/markers/)
 - [`GET /api/v1/polls/:id`](https://docs.joinmastodon.org/methods/statuses/polls/)
 - [`POST /api/v1/polls/:id/votes`](https://docs.joinmastodon.org/methods/statuses/polls/)
+- [`DELETE /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`GET /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`PUSH /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`PUT /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
 - [`POST /api/v1/reports`](https://docs.joinmastodon.org/methods/accounts/reports/)
 - [`GET /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
 - [`PUT /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
 - [`DELETE /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
+- [`GET /api/v1/streaming`](https://docs.joinmastodon.org/methods/timelines/streaming/)
 - [`DELETE /api/v1/suggestions/:id`](https://docs.joinmastodon.org/methods/accounts/suggestions/)
diff --git a/include/api.php b/include/api.php
index 8e89895ded..935bd11d63 100644
--- a/include/api.php
+++ b/include/api.php
@@ -44,6 +44,7 @@ use Friendica\Model\Photo;
 use Friendica\Model\Post;
 use Friendica\Model\User;
 use Friendica\Model\Verb;
+use Friendica\Module\BaseApi;
 use Friendica\Network\HTTPException;
 use Friendica\Network\HTTPException\BadRequestException;
 use Friendica\Network\HTTPException\ExpectationFailedException;
@@ -88,6 +89,11 @@ $called_api = [];
  */
 function api_user()
 {
+	$user = BaseApi::getCurrentUserID(true);
+	if (!empty($user)) {
+		return $user;
+	}
+
 	if (!empty($_SESSION['allow_api'])) {
 		return local_user();
 	}
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 2b2699328d..f6bec1561c 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -2882,7 +2882,7 @@ class Item
 						'mime'   => $attachment['mimetype'],
 					],
 				]);
-				if ($item['post-type'] == Item::PT_AUDIO) {
+				if (($item['post-type'] ?? null) == Item::PT_AUDIO) {
 					$leading .= $media;
 				} else {
 					$trailing .= $media;
diff --git a/src/Module/Api/Mastodon/Accounts.php b/src/Module/Api/Mastodon/Accounts.php
index a5c9b81045..f650af0587 100644
--- a/src/Module/Api/Mastodon/Accounts.php
+++ b/src/Module/Api/Mastodon/Accounts.php
@@ -24,6 +24,7 @@ namespace Friendica\Module\Api\Mastodon;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Module\BaseApi;
 
 /**
@@ -37,13 +38,22 @@ class Accounts extends BaseApi
 	 */
 	public static function rawContent(array $parameters = [])
 	{
-		if (empty($parameters['id'])) {
+		if (empty($parameters['id']) && empty($parameters['name'])) {
 			DI::mstdnError()->UnprocessableEntity();
 		}
 
-		$id = $parameters['id'];
-		if (!DBA::exists('contact', ['id' => $id, 'uid' => 0])) {
-			DI::mstdnError()->RecordNotFound();
+		if (!empty($parameters['id'])) {
+			$id = $parameters['id'];
+			if (!DBA::exists('contact', ['id' => $id, 'uid' => 0])) {
+				DI::mstdnError()->RecordNotFound();
+			}
+		} else {
+			$contact = Contact::selectFirst(['id'], ['nick' => $parameters['name'], 'uid' => 0]);
+			if (!empty($contact['id'])) {
+				$id = $contact['id'];
+			} elseif (!($id = Contact::getIdForURL($parameters['name'], 0, false))) {
+				DI::mstdnError()->RecordNotFound();
+			}
 		}
 
 		$account = DI::mstdnAccount()->createFromContactId($id, self::getCurrentUserID());
diff --git a/src/Module/Api/Mastodon/Filters.php b/src/Module/Api/Mastodon/Filters.php
index cdcefc97f9..81794e679c 100644
--- a/src/Module/Api/Mastodon/Filters.php
+++ b/src/Module/Api/Mastodon/Filters.php
@@ -29,12 +29,21 @@ use Friendica\Module\BaseApi;
  */
 class Filters extends BaseApi
 {
+	public static function post(array $parameters = [])
+	{
+		self::login(self::SCOPE_WRITE);
+
+		self::unsupported('post');
+	}
+
 	/**
 	 * @param array $parameters
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function rawContent(array $parameters = [])
 	{
-		System::jsonError(404, ['error' => 'Record not found']);
+		self::login(self::SCOPE_READ);
+
+		System::jsonExit([]);
 	}
 }
diff --git a/src/Module/Api/Mastodon/Instance/Rules.php b/src/Module/Api/Mastodon/Instance/Rules.php
new file mode 100644
index 0000000000..9b7d2dc77f
--- /dev/null
+++ b/src/Module/Api/Mastodon/Instance/Rules.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Module\Api\Mastodon\Instance;
+
+use Friendica\Content\Text\BBCode;
+use Friendica\Content\Text\HTML;
+use Friendica\Core\System;
+use Friendica\DI;
+use Friendica\Module\BaseApi;
+use Friendica\Network\HTTPException;
+
+/**
+ * Undocumented API endpoint
+ */
+class Rules extends BaseApi
+{
+	/**
+	 * @param array $parameters
+	 * @throws HTTPException\InternalServerErrorException
+	 */
+	public static function rawContent(array $parameters = [])
+	{
+		$rules = [];
+		$id    = 0;
+
+		if (DI::config()->get('system', 'tosdisplay')) {
+			$html = BBCode::convert(DI::config()->get('system', 'tostext'), false, BBCode::EXTERNAL);
+
+			$msg = HTML::toPlaintext($html, 0, true);
+			foreach (explode("\n", $msg) as $line) {
+				$line = trim($line);
+				if ($line) {
+					$rules[] = ['id' => (string)++$id, 'text' => $line];
+				}
+			}
+		}
+
+		System::jsonExit($rules);
+	}
+}
diff --git a/src/Module/BaseApi.php b/src/Module/BaseApi.php
index 7735b9802c..015324569b 100644
--- a/src/Module/BaseApi.php
+++ b/src/Module/BaseApi.php
@@ -238,7 +238,7 @@ class BaseApi extends BaseModule
 	 *
 	 * @return int User ID
 	 */
-	protected static function getCurrentUserID()
+	public static function getCurrentUserID(bool $nologin = false)
 	{
 		if (empty(self::$current_user_id)) {
 			self::$current_token = self::getTokenByBearer();
@@ -247,7 +247,10 @@ class BaseApi extends BaseModule
 			} else {
 				self::$current_user_id = 0;
 			}
+		}
 
+		if ($nologin) {
+			return (int)self::$current_user_id;
 		}
 
 		if (empty(self::$current_user_id)) {
diff --git a/static/routes.config.php b/static/routes.config.php
index 4569038a41..815d833ada 100644
--- a/static/routes.config.php
+++ b/static/routes.config.php
@@ -60,6 +60,7 @@ return [
 			'/accounts'                          => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
 			'/accounts/{id:\d+}'                 => [Module\Api\Mastodon\Accounts::class,                 [R::GET         ]],
 			'/accounts/{id:\d+}/statuses'        => [Module\Api\Mastodon\Accounts\Statuses::class,        [R::GET         ]],
+			'/accounts/{id:\d+}/featured_tags'   => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // @todo
 			'/accounts/{id:\d+}/followers'       => [Module\Api\Mastodon\Accounts\Followers::class,       [R::GET         ]],
 			'/accounts/{id:\d+}/following'       => [Module\Api\Mastodon\Accounts\Following::class,       [R::GET         ]],
 			'/accounts/{id:\d+}/lists'           => [Module\Api\Mastodon\Accounts\Lists::class,           [R::GET         ]],
@@ -77,6 +78,7 @@ return [
 			'/accounts/search'                   => [Module\Api\Mastodon\Accounts\Search::class,          [R::GET         ]],
 			'/accounts/update_credentials'       => [Module\Api\Mastodon\Accounts\UpdateCredentials::class, [R::PATCH     ]],
 			'/accounts/verify_credentials'       => [Module\Api\Mastodon\Accounts\VerifyCredentials::class, [R::GET       ]],
+			'/accounts/{name}'                   => [Module\Api\Mastodon\Accounts::class,                 [R::GET         ]],
 			'/admin/accounts'                    => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // not supported
 			'/admin/accounts/{id:\d+}'           => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // not supported
 			'/admin/accounts/{id:\d+}/{action}'  => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
@@ -108,6 +110,7 @@ return [
 			'/instance'                          => [Module\Api\Mastodon\Instance::class,                 [R::GET         ]],
 			'/instance/activity'                 => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // @todo
 			'/instance/peers'                    => [Module\Api\Mastodon\Instance\Peers::class,           [R::GET         ]],
+			'/instance/rules'                    => [Module\Api\Mastodon\Instance\Rules::class,           [R::GET         ]], // not supported
 			'/lists'                             => [Module\Api\Mastodon\Lists::class,                    [R::GET, R::POST]],
 			'/lists/{id:\d+}'                    => [Module\Api\Mastodon\Lists::class,                    [R::GET, R::PUT, R::DELETE]],
 			'/lists/{id:\d+}/accounts'           => [Module\Api\Mastodon\Lists\Accounts::class,           [R::GET, R::POST, R::DELETE]],
@@ -122,6 +125,7 @@ return [
 			'/polls/{id:\d+}'                    => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // not supported
 			'/polls/{id:\d+}/votes'              => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
 			'/preferences'                       => [Module\Api\Mastodon\Preferences::class,              [R::GET         ]],
+			'/push/subscription'                 => [Module\Api\Mastodon\Unimplemented::class,            [R::GET, R::POST, R::PUT, R::DELETE]], // not supported
 			'/reports'                           => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
 			'/scheduled_statuses'                => [Module\Api\Mastodon\ScheduledStatuses::class,        [R::GET         ]], // Dummy, not supported
 			'/scheduled_statuses/{id:\d+}'       => [Module\Api\Mastodon\Unimplemented::class,            [R::GET, R::PUT, R::DELETE]], // not supported
@@ -140,6 +144,7 @@ return [
 			'/statuses/{id:\d+}/unmute'          => [Module\Api\Mastodon\Statuses\Unmute::class,          [        R::POST]],
 			'/statuses/{id:\d+}/pin'             => [Module\Api\Mastodon\Statuses\Pin::class,             [        R::POST]],
 			'/statuses/{id:\d+}/unpin'           => [Module\Api\Mastodon\Statuses\Unpin::class,           [        R::POST]],
+			'/streaming'                         => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]],
 			'/suggestions'                       => [Module\Api\Mastodon\Suggestions::class,              [R::GET         ]],
 			'/suggestions/{id:\d+}'              => [Module\Api\Mastodon\Unimplemented::class,            [R::DELETE      ]], // not implemented
 			'/timelines/direct'                  => [Module\Api\Mastodon\Timelines\Direct::class,         [R::GET         ]],
@@ -160,6 +165,7 @@ return [
 		'/followers/list'                        => [Module\Api\Twitter\FollowersList::class,  [R::GET         ]],
 		'/friends/ids'                           => [Module\Api\Twitter\FriendsIds::class,     [R::GET         ]],
 		'/friends/list'                          => [Module\Api\Twitter\FriendsList::class,    [R::GET         ]],
+		'/meta'                                  => [Module\Api\Mastodon\Unimplemented::class, [R::POST        ]], // not supported
 		'/oembed'                                => [Module\Api\Mastodon\Unimplemented::class, [R::GET         ]],
 		'/proofs'                                => [Module\Api\Mastodon\Proofs::class,        [R::GET         ]], // Dummy, not supported
 	],
diff --git a/tests/legacy/ApiTest.php b/tests/legacy/ApiTest.php
index 423294e597..c94571d857 100644
--- a/tests/legacy/ApiTest.php
+++ b/tests/legacy/ApiTest.php
@@ -157,8 +157,8 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertStatus(array $status = [])
 	{
-		self::assertInternalType('string', $status['text'] ?? '');
-		self::assertInternalType('int', $status['id'] ?? '');
+		self::assertIsString($status['text'] ?? '');
+		self::assertIsInt($status['id'] ?? '');
 		// We could probably do more checks here.
 	}
 
@@ -171,9 +171,9 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertList(array $list = [])
 	{
-		self::assertInternalType('string', $list['name']);
-		self::assertInternalType('int', $list['id']);
-		self::assertInternalType('string', $list['id_str']);
+		self::assertIsString($list['name']);
+		self::assertIsInt($list['id']);
+		self::assertIsString('string', $list['id_str']);
 		self::assertContains($list['mode'], ['public', 'private']);
 		// We could probably do more checks here.
 	}
@@ -762,7 +762,7 @@ class ApiTest extends FixtureTest
 	public function testApiRssExtraWithoutUserInfo()
 	{
 		$result = api_rss_extra($this->app, [], null);
-		self::assertInternalType('array', $result['$user']);
+		self::assertIsArray($result['$user']);
 		self::assertArrayHasKey('alternate', $result['$rss']);
 		self::assertArrayHasKey('self', $result['$rss']);
 		self::assertArrayHasKey('base', $result['$rss']);
@@ -2355,7 +2355,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetAttachmentsWithImage()
 	{
 		$body = '[img]http://via.placeholder.com/1x1.png[/img]';
-		self::assertInternalType('array', api_get_attachments($body));
+		self::assertIsArray(api_get_attachments($body));
 	}
 
 	/**
@@ -2367,7 +2367,7 @@ class ApiTest extends FixtureTest
 	{
 		$_SERVER['HTTP_USER_AGENT'] = 'AndStatus';
 		$body                       = '[img]http://via.placeholder.com/1x1.png[/img]';
-		self::assertInternalType('array', api_get_attachments($body));
+		self::assertIsArray(api_get_attachments($body));
 	}
 
 	/**
@@ -2378,7 +2378,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetEntitities()
 	{
 		$text = 'text';
-		self::assertInternalType('array', api_get_entitities($text, 'bbcode'));
+		self::assertIsArray(api_get_entitities($text, 'bbcode'));
 	}
 
 	/**
@@ -2391,10 +2391,10 @@ class ApiTest extends FixtureTest
 		$_REQUEST['include_entities'] = 'true';
 		$text                         = 'text';
 		$result                       = api_get_entitities($text, 'bbcode');
-		self::assertInternalType('array', $result['hashtags']);
-		self::assertInternalType('array', $result['symbols']);
-		self::assertInternalType('array', $result['urls']);
-		self::assertInternalType('array', $result['user_mentions']);
+		self::assertIsArray($result['hashtags']);
+		self::assertIsArray($result['symbols']);
+		self::assertIsArray($result['urls']);
+		self::assertIsArray($result['user_mentions']);
 	}
 
 	/**
@@ -2532,7 +2532,7 @@ class ApiTest extends FixtureTest
 		$result = api_account_rate_limit_status('json');
 		self::assertEquals(150, $result['hash']['remaining_hits']);
 		self::assertEquals(150, $result['hash']['hourly_limit']);
-		self::assertInternalType('int', $result['hash']['reset_time_in_seconds']);
+		self::assertIsInt($result['hash']['reset_time_in_seconds']);
 	}
 
 	/**