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diff --git a/lib/pleroma/web/mastodon_api/views/instance_view.ex b/lib/pleroma/web/mastodon_api/views/instance_view.ex
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+++ b/lib/pleroma/web/mastodon_api/views/instance_view.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MastodonAPI.InstanceView do
+  use Pleroma.Web, :view
+
+  alias Pleroma.Config
+  alias Pleroma.Web.ActivityPub.MRF
+
+  @mastodon_api_level "2.7.2"
+
+  def render("show.json", _) do
+    instance = Config.get(:instance)
+
+    %{
+      uri: Pleroma.Web.Endpoint.url(),
+      title: Keyword.get(instance, :name),
+      description: Keyword.get(instance, :description),
+      short_description: Keyword.get(instance, :short_description),
+      version: "#{@mastodon_api_level} (compatible; #{Pleroma.Application.named_version()})",
+      email: Keyword.get(instance, :email),
+      urls: %{
+        streaming_api: Pleroma.Web.Endpoint.websocket_url()
+      },
+      stats: Pleroma.Stats.get_stats(),
+      thumbnail:
+        URI.merge(Pleroma.Web.Endpoint.url(), Keyword.get(instance, :instance_thumbnail))
+        |> to_string,
+      languages: Keyword.get(instance, :languages, ["en"]),
+      registrations: Keyword.get(instance, :registrations_open),
+      approval_required: Keyword.get(instance, :account_approval_required),
+      # Extra (not present in Mastodon):
+      max_toot_chars: Keyword.get(instance, :limit),
+      max_media_attachments: Keyword.get(instance, :max_media_attachments),
+      poll_limits: Keyword.get(instance, :poll_limits),
+      upload_limit: Keyword.get(instance, :upload_limit),
+      avatar_upload_limit: Keyword.get(instance, :avatar_upload_limit),
+      background_upload_limit: Keyword.get(instance, :background_upload_limit),
+      banner_upload_limit: Keyword.get(instance, :banner_upload_limit),
+      background_image: Pleroma.Web.Endpoint.url() <> Keyword.get(instance, :background_image),
+      shout_limit: Config.get([:shout, :limit]),
+      description_limit: Keyword.get(instance, :description_limit),
+      pleroma: %{
+        metadata: %{
+          account_activation_required: Keyword.get(instance, :account_activation_required),
+          features: features(),
+          federation: federation(),
+          fields_limits: fields_limits(),
+          post_formats: Config.get([:instance, :allowed_post_formats]),
+          birthday_required: Config.get([:instance, :birthday_required]),
+          birthday_min_age: Config.get([:instance, :birthday_min_age])
+        },
+        stats: %{mau: Pleroma.User.active_user_count()},
+        vapid_public_key: Keyword.get(Pleroma.Web.Push.vapid_config(), :public_key)
+      }
+    }
+  end
+
+  def features do
+    [
+      "pleroma_api",
+      "mastodon_api",
+      "mastodon_api_streaming",
+      "polls",
+      "v2_suggestions",
+      "pleroma_explicit_addressing",
+      "shareable_emoji_packs",
+      "multifetch",
+      "pleroma:api/v1/notifications:include_types_filter",
+      "editing",
+      if Config.get([:activitypub, :blockers_visible]) do
+        "blockers_visible"
+      end,
+      if Config.get([:media_proxy, :enabled]) do
+        "media_proxy"
+      end,
+      if Config.get([:gopher, :enabled]) do
+        "gopher"
+      end,
+      # backwards compat
+      if Config.get([:shout, :enabled]) do
+        "chat"
+      end,
+      if Config.get([:shout, :enabled]) do
+        "shout"
+      end,
+      if Config.get([:instance, :allow_relay]) do
+        "relay"
+      end,
+      if Config.get([:instance, :safe_dm_mentions]) do
+        "safe_dm_mentions"
+      end,
+      "pleroma_emoji_reactions",
+      "pleroma_chat_messages",
+      if Config.get([:instance, :show_reactions]) do
+        "exposable_reactions"
+      end,
+      if Config.get([:instance, :profile_directory]) do
+        "profile_directory"
+      end,
+      "pleroma:get:main/ostatus"
+    ]
+    |> Enum.filter(& &1)
+  end
+
+  def federation do
+    quarantined = Config.get([:instance, :quarantined_instances], [])
+
+    if Config.get([:mrf, :transparency]) do
+      {:ok, data} = MRF.describe()
+
+      data
+      |> Map.put(
+        :quarantined_instances,
+        Enum.map(quarantined, fn {instance, _reason} -> instance end)
+      )
+      # This is for backwards compatibility. We originally didn't sent
+      # extra info like a reason why an instance was rejected/quarantined/etc.
+      # Because we didn't want to break backwards compatibility it was decided
+      # to add an extra "info" key.
+      |> Map.put(:quarantined_instances_info, %{
+        "quarantined_instances" =>
+          quarantined
+          |> Enum.map(fn {instance, reason} -> {instance, %{"reason" => reason}} end)
+          |> Map.new()
+      })
+    else
+      %{}
+    end
+    |> Map.put(:enabled, Config.get([:instance, :federating]))
+  end
+
+  def fields_limits do
+    %{
+      max_fields: Config.get([:instance, :max_account_fields]),
+      max_remote_fields: Config.get([:instance, :max_remote_account_fields]),
+      name_length: Config.get([:instance, :account_field_name_length]),
+      value_length: Config.get([:instance, :account_field_value_length])
+    }
+  end
+end