diff --git a/app/Services/Federation/ActiveSharedInboxService.php b/app/Services/Federation/ActiveSharedInboxService.php
new file mode 100644
index 000000000..4f7020a8f
--- /dev/null
+++ b/app/Services/Federation/ActiveSharedInboxService.php
@@ -0,0 +1,244 @@
+<?php
+
+namespace App\Services\Federation;
+
+use App\Profile;
+use App\Util\ActivityPub\Helpers;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Redis;
+use Illuminate\Support\Facades\Storage;
+
+class ActiveSharedInboxService
+{
+    const CACHE_KEY = 'pf:services:asinbox:list';
+
+    const CACHE_KEY_CHECK = 'pf:services:asinbox:list-check';
+
+    const CACHE_FILE_NAME = 'ap_asis.json';
+
+    const CACHE_FILE_VERSION = 1;
+
+    public static function get()
+    {
+        $res = Redis::smembers(self::CACHE_KEY);
+
+        if ($res) {
+            return $res;
+        }
+
+        if (! $res && self::count() == '0') {
+            return self::warmCheck();
+        }
+    }
+
+    public static function contains($member)
+    {
+        return Redis::sismember(self::CACHE_KEY, strtolower($member));
+    }
+
+    public static function count()
+    {
+        return Redis::scard(self::CACHE_KEY);
+    }
+
+    public static function add($member)
+    {
+        if (empty($member)) {
+            return false;
+        }
+        if (! str_starts_with(strtolower($member), 'https://')) {
+            $member = 'https://'.$member;
+        }
+        $validUrl = Helpers::validateUrl($member, false, true);
+        if (! $validUrl) {
+            return false;
+        }
+
+        return Redis::sadd(self::CACHE_KEY, strtolower($member));
+    }
+
+    public static function remove($member)
+    {
+        if (empty($member)) {
+            return false;
+        }
+        if (! str_starts_with(strtolower($member), 'https://')) {
+            $member = 'https://'.$member;
+        }
+        $validUrl = Helpers::validateUrl($member);
+        if (! $validUrl) {
+            return false;
+        }
+
+        return Redis::srem(self::CACHE_KEY, strtolower($member));
+    }
+
+    public static function warmCheck()
+    {
+        if (! Cache::has(self::CACHE_KEY_CHECK)) {
+            return self::warmCacheFromDatabase();
+        }
+
+        return [];
+    }
+
+    public static function warmCacheFromDatabase()
+    {
+        $res = self::parseCacheFileData() ? self::parseCacheFileData() : self::getFromDatabase();
+        if (Storage::has(self::CACHE_FILE_NAME)) {
+            $res = Storage::get(self::CACHE_FILE_NAME);
+            if (! $res) {
+                $res = self::getFromDatabase();
+            } else {
+                $res = json_decode($res, true);
+                if (isset($res['version'], $res['data'], $res['created'], $res['updated'])) {
+                    if (now()->parse($res['updated'])->lt(now()->subMonths(6))) {
+                        $res = self::getFromDatabase();
+                    } else {
+                        if ($res['version'] === self::CACHE_FILE_VERSION) {
+                            $res = $res['data'];
+                        } else {
+                            $res = self::getFromDatabase();
+                        }
+                    }
+                } else {
+                    $res = self::getFromDatabase();
+                }
+            }
+        } else {
+            $res = self::getFromDatabase();
+        }
+
+        if (! $res) {
+            return [];
+        }
+
+        $filteredList = [];
+
+        foreach ($res as $value) {
+            if (! $value || ! str_starts_with($value, 'https://')) {
+                continue;
+            }
+            $passed = self::add($value);
+            if ($passed) {
+                $filteredList[] = $value;
+            }
+        }
+
+        self::saveCacheToDisk($filteredList);
+        Cache::remember(self::CACHE_KEY_CHECK, 86400, function () {
+            return true;
+        });
+
+        return $res;
+    }
+
+    public static function parseCacheFileData()
+    {
+        if (Storage::has(self::CACHE_FILE_NAME)) {
+            $res = Storage::get(self::CACHE_FILE_NAME);
+            if (! $res) {
+                return false;
+            } else {
+                $res = json_decode($res, true);
+                if (! $res || isset($res['version'], $res['data'], $res['created'], $res['updated'])) {
+                    if (now()->parse($res['updated'])->lt(now()->subMonths(6))) {
+                        return false;
+                    } else {
+                        if ($res['version'] === self::CACHE_FILE_VERSION) {
+                            return $res;
+                        } else {
+                            return false;
+                        }
+                    }
+                } else {
+                    return false;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    public static function transformCacheFileData($res)
+    {
+        return [
+            'id' => 'pixelfed/storage/app/'.self::CACHE_FILE_NAME,
+            'version' => self::CACHE_FILE_VERSION,
+            'created' => now()->format('c'),
+            'updated' => now()->format('c'),
+            'length' => count($res),
+            'data' => $res,
+        ];
+    }
+
+    public static function updateCacheFileData()
+    {
+        $res = self::parseCacheFileData();
+        if (! $res) {
+            return false;
+        }
+
+        $diff = [];
+        $nodes = $res['data'];
+        $latest = self::getFromDatabase();
+        $merge = array_merge($nodes, $latest);
+
+        foreach ($merge as $val) {
+            if (! in_array($val, $nodes)) {
+                if (self::add($val)) {
+                    $nodes[] = $val;
+                } else {
+                    unset($nodes[$val]);
+                }
+            }
+        }
+
+        $data = [
+            'id' => 'pixelfed/storage/app/'.self::CACHE_FILE_NAME,
+            'version' => self::CACHE_FILE_VERSION,
+            'created' => $res['created'],
+            'updated' => now()->format('c'),
+            'length' => count($nodes),
+            'data' => $nodes,
+        ];
+
+        $contents = json_encode($data, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
+        Storage::put(self::CACHE_FILE_NAME, $contents);
+
+        return 1;
+    }
+
+    public static function saveCacheToDisk($res = false)
+    {
+        if (! $res) {
+            return;
+        }
+
+        $contents = json_encode(self::transformCacheFileData($res), JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
+        Storage::put(self::CACHE_FILE_NAME, $contents);
+    }
+
+    public static function getFromDatabase()
+    {
+        return Profile::whereNotNull('sharedInbox')->groupBy('sharedInbox')->pluck('sharedInbox')->toArray();
+    }
+
+    public static function scanForUpdates()
+    {
+        $res = self::getFromDatabase();
+        $filteredList = [];
+
+        foreach ($res as $value) {
+            if (! $value || ! str_starts_with($value, 'https://')) {
+                continue;
+            }
+            Redis::sadd(self::CACHE_KEY, $value);
+            $filteredList[] = $value;
+        }
+
+        self::saveCacheToDisk($filteredList);
+
+        return 1;
+    }
+}