diff --git a/CMakeLists.txt b/CMakeLists.txt
index cee63a3..24aef43 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.7)
 project (mastodon-cpp
-         VERSION 0.18.1
+         VERSION 0.18.2
          LANGUAGES CXX
 )
 
diff --git a/src/easy/easy.hpp b/src/easy/easy.hpp
index 8c23bd9..cc47934 100644
--- a/src/easy/easy.hpp
+++ b/src/easy/easy.hpp
@@ -341,9 +341,9 @@ public:
         /*!
          *  @brief  Returns true if the Entity holds valid data
          *  
-         *  @since  before 0.11.0
+         *  @since  before 0.11.0 (virtual since 0.18.2)
          */
-        const bool valid() const;
+        virtual const bool valid() const = 0;
 
         /*!
          *  @brief  Returns error string sent by the server
@@ -444,9 +444,20 @@ public:
 
         const std::uint_fast64_t stouint64(const string &str) const;
 
+        /*!
+         *  @brief  Checks if an Entity is valid
+         *
+         *  @param  attributes  The attributes to check
+         *
+         *  @return true if all attributes are set
+         *  
+         *  @since  0.18.2
+         */
+        const bool
+        check_valid(const std::vector<string> &attributes) const;
+
     private:
         Json::Value _tree;
-        bool _valid;
         mutable bool _was_set;
     };
 
diff --git a/src/easy/entities/account.cpp b/src/easy/entities/account.cpp
index 447b74a..38a98c9 100644
--- a/src/easy/entities/account.cpp
+++ b/src/easy/entities/account.cpp
@@ -14,6 +14,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <array>
 #include "account.hpp"
 #include "macros.hpp"
 
@@ -28,6 +29,30 @@ Account::Account()
 : Entity()
 {}
 
+const bool Account::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "username",
+        "acct",
+        "display_name",
+        "locked",
+        "created_at",
+        "followers_count",
+        "following_count",
+        "statuses_count",
+        "note",
+        "url",
+        "avatar",
+        "avatar_static",
+        "header",
+        "header_static"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string Account::acct() const
 {
     return get_string("acct");
diff --git a/src/easy/entities/account.hpp b/src/easy/entities/account.hpp
index ea7fd1b..978cd4e 100644
--- a/src/easy/entities/account.hpp
+++ b/src/easy/entities/account.hpp
@@ -69,6 +69,8 @@ namespace Mastodon
          */
         Account();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns username
          *
diff --git a/src/easy/entities/application.cpp b/src/easy/entities/application.cpp
index bec917f..57fd74b 100644
--- a/src/easy/entities/application.cpp
+++ b/src/easy/entities/application.cpp
@@ -27,6 +27,11 @@ Application::Application()
 : Entity()
 {}
 
+const bool Application::valid() const
+{
+    return Entity::check_valid({"name"});
+}
+
 const string Application::name() const
 {
     return get_string("name");
diff --git a/src/easy/entities/application.hpp b/src/easy/entities/application.hpp
index feba73f..e88e4b2 100644
--- a/src/easy/entities/application.hpp
+++ b/src/easy/entities/application.hpp
@@ -56,6 +56,8 @@ namespace Mastodon
          */
         Application();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the name of the application
          *  
diff --git a/src/easy/entities/attachment.cpp b/src/easy/entities/attachment.cpp
index c155099..40203e6 100644
--- a/src/easy/entities/attachment.cpp
+++ b/src/easy/entities/attachment.cpp
@@ -29,6 +29,19 @@ Attachment::Attachment()
 : Entity()
 {}
 
+const bool Attachment::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "type",
+        "url",
+        "preview_url"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const double Attachment::aspect() const
 {
     return get_double("meta.original.aspect");
diff --git a/src/easy/entities/attachment.hpp b/src/easy/entities/attachment.hpp
index 805c4f7..ab38050 100644
--- a/src/easy/entities/attachment.hpp
+++ b/src/easy/entities/attachment.hpp
@@ -60,6 +60,8 @@ namespace Mastodon
          */
         Attachment();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Aspect of original image
          *  
diff --git a/src/easy/entities/card.cpp b/src/easy/entities/card.cpp
index c8dec9d..129651c 100644
--- a/src/easy/entities/card.cpp
+++ b/src/easy/entities/card.cpp
@@ -28,6 +28,19 @@ Card::Card()
 : Entity()
 {}
 
+const bool Card::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "url",
+        "title",
+        "description",
+        "type"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string Card::author_name() const
 {
     return get_string("author_name");
diff --git a/src/easy/entities/card.hpp b/src/easy/entities/card.hpp
index 7c6437a..12a4e45 100644
--- a/src/easy/entities/card.hpp
+++ b/src/easy/entities/card.hpp
@@ -58,6 +58,8 @@ namespace Mastodon
          */
         Card();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the name of the author
          *  
diff --git a/src/easy/entities/context.cpp b/src/easy/entities/context.cpp
index 9f521a7..9dc84e1 100644
--- a/src/easy/entities/context.cpp
+++ b/src/easy/entities/context.cpp
@@ -28,6 +28,17 @@ Context::Context()
 : Entity()
 {}
 
+const bool Context::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "ancestors",
+        "descendants"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const std::vector<Easy::Status> Context::ancestors() const
 {
     const Json::Value node = get("ancestors");
diff --git a/src/easy/entities/context.hpp b/src/easy/entities/context.hpp
index a8e1ed9..84d6117 100644
--- a/src/easy/entities/context.hpp
+++ b/src/easy/entities/context.hpp
@@ -59,6 +59,8 @@ namespace Mastodon
          */
         Context();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the ancestors of the Status as vector of Statuses
          *  
diff --git a/src/easy/entities/emoji.cpp b/src/easy/entities/emoji.cpp
index 3782b02..49ff660 100644
--- a/src/easy/entities/emoji.cpp
+++ b/src/easy/entities/emoji.cpp
@@ -28,6 +28,18 @@ Emoji::Emoji()
 : Entity()
 {}
 
+const bool Emoji::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "shortcode",
+        "static_url",
+        "url"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string Emoji::shortcode() const
 {
     return get_string("shortcode");
diff --git a/src/easy/entities/emoji.hpp b/src/easy/entities/emoji.hpp
index 76779bd..3b5e5af 100644
--- a/src/easy/entities/emoji.hpp
+++ b/src/easy/entities/emoji.hpp
@@ -56,6 +56,8 @@ namespace Mastodon
          */
         Emoji();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the shortcode of the emoji
          *  
diff --git a/src/easy/entities/instance.cpp b/src/easy/entities/instance.cpp
index ef658f6..e847682 100644
--- a/src/easy/entities/instance.cpp
+++ b/src/easy/entities/instance.cpp
@@ -30,6 +30,23 @@ Instance::Instance()
 : Entity()
 {}
 
+const bool Instance::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "uri",
+        "title",
+        "description",
+        "email",
+        "version",
+        "urls",
+        "languages",
+        "contact_account"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const Easy::Account Instance::contact_account() const
 {
     const Json::Value node = get("contact_account");
diff --git a/src/easy/entities/instance.hpp b/src/easy/entities/instance.hpp
index 1274c45..5c0cb5c 100644
--- a/src/easy/entities/instance.hpp
+++ b/src/easy/entities/instance.hpp
@@ -59,6 +59,8 @@ namespace Mastodon
          */
         Instance();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the Account of the admin or another contact person
          *  
diff --git a/src/easy/entities/list.cpp b/src/easy/entities/list.cpp
index ba64357..c0d12a9 100644
--- a/src/easy/entities/list.cpp
+++ b/src/easy/entities/list.cpp
@@ -29,6 +29,17 @@ List::List()
 : Entity()
 {}
 
+const bool List::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "title"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const uint_fast64_t List::id() const
 {
     return stouint64(get_string("id"));
diff --git a/src/easy/entities/list.hpp b/src/easy/entities/list.hpp
index b5d6a8c..2a8a324 100644
--- a/src/easy/entities/list.hpp
+++ b/src/easy/entities/list.hpp
@@ -59,6 +59,8 @@ namespace Mastodon
          */
         List();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns list-ID
          *  
diff --git a/src/easy/entities/mention.cpp b/src/easy/entities/mention.cpp
index 17dd000..78a369e 100644
--- a/src/easy/entities/mention.cpp
+++ b/src/easy/entities/mention.cpp
@@ -27,6 +27,19 @@ Mention::Mention()
 : Entity()
 {}
 
+const bool Mention::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "url",
+        "username",
+        "acct",
+        "id"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string Mention::acct() const
 {
     return get_string("acct");
diff --git a/src/easy/entities/mention.hpp b/src/easy/entities/mention.hpp
index 70a1834..c0a7376 100644
--- a/src/easy/entities/mention.hpp
+++ b/src/easy/entities/mention.hpp
@@ -59,6 +59,8 @@ namespace Mastodon
          */
         Mention();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns acct
          *  
diff --git a/src/easy/entities/notification.cpp b/src/easy/entities/notification.cpp
index 6d672b0..b6d277e 100644
--- a/src/easy/entities/notification.cpp
+++ b/src/easy/entities/notification.cpp
@@ -28,6 +28,19 @@ Notification::Notification()
 : Entity()
 {}
 
+const bool Notification::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "type",
+        "created_at",
+        "account"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const Easy::Account Notification::account() const
 {
     const Json::Value node = get("account");
diff --git a/src/easy/entities/notification.hpp b/src/easy/entities/notification.hpp
index d9efe09..b7b766a 100644
--- a/src/easy/entities/notification.hpp
+++ b/src/easy/entities/notification.hpp
@@ -64,6 +64,8 @@ namespace Mastodon
          */
         Notification();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the Account sending the notification to the user
          *  
diff --git a/src/easy/entities/pushsubscription.cpp b/src/easy/entities/pushsubscription.cpp
index 11f5199..3882c89 100644
--- a/src/easy/entities/pushsubscription.cpp
+++ b/src/easy/entities/pushsubscription.cpp
@@ -32,6 +32,18 @@ PushSubscription::PushSubscription()
 : Entity()
 {}
 
+const bool PushSubscription::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "endpoint",
+        "server_key"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string PushSubscription::endpoint() const
 {
     return get_string("endpoint");
diff --git a/src/easy/entities/pushsubscription.hpp b/src/easy/entities/pushsubscription.hpp
index e7c0e6a..1f7b50d 100644
--- a/src/easy/entities/pushsubscription.hpp
+++ b/src/easy/entities/pushsubscription.hpp
@@ -59,6 +59,8 @@ namespace Mastodon
          */
         PushSubscription();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns push subscription ID
          *  
diff --git a/src/easy/entities/relationship.cpp b/src/easy/entities/relationship.cpp
index c775d73..58c3f31 100644
--- a/src/easy/entities/relationship.cpp
+++ b/src/easy/entities/relationship.cpp
@@ -27,6 +27,23 @@ Relationship::Relationship()
 : Entity()
 {}
 
+const bool Relationship::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "following",
+        "followed_by",
+        "blocking",
+        "muting",
+        "muting_notifications",
+        "requested",
+        "domain_blocking"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const bool Relationship::blocking() const
 {
     return get_bool("blocking");
diff --git a/src/easy/entities/relationship.hpp b/src/easy/entities/relationship.hpp
index d889685..5754bfc 100644
--- a/src/easy/entities/relationship.hpp
+++ b/src/easy/entities/relationship.hpp
@@ -58,6 +58,8 @@ namespace Mastodon
          */
         Relationship();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns true if the user is blocking the account
          *  
diff --git a/src/easy/entities/report.cpp b/src/easy/entities/report.cpp
index bbbd0f6..7a85b5e 100644
--- a/src/easy/entities/report.cpp
+++ b/src/easy/entities/report.cpp
@@ -27,6 +27,17 @@ Report::Report()
 : Entity()
 {}
 
+const bool Report::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "action_taken"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const bool Report::action_taken() const
 {
     return get_bool("action_taken");
diff --git a/src/easy/entities/report.hpp b/src/easy/entities/report.hpp
index 35e0412..ef80a74 100644
--- a/src/easy/entities/report.hpp
+++ b/src/easy/entities/report.hpp
@@ -58,6 +58,8 @@ namespace Mastodon
          */
         Report();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns true if an action was taken in response to the
          *          report
diff --git a/src/easy/entities/results.cpp b/src/easy/entities/results.cpp
index 089315d..e571802 100644
--- a/src/easy/entities/results.cpp
+++ b/src/easy/entities/results.cpp
@@ -28,6 +28,18 @@ Results::Results()
 : Entity()
 {}
 
+const bool Results::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "accounts",
+        "statuses",
+        "hashtags"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const std::vector<Easy::Account> Results::accounts() const
 {
     const Json::Value node = get("accounts");
diff --git a/src/easy/entities/results.hpp b/src/easy/entities/results.hpp
index 9aca8c0..685717d 100644
--- a/src/easy/entities/results.hpp
+++ b/src/easy/entities/results.hpp
@@ -63,6 +63,8 @@ namespace Mastodon
          */
         Results();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns an array of matched Accounts
          *  
diff --git a/src/easy/entities/status.cpp b/src/easy/entities/status.cpp
index 6bfcfd7..3b7f383 100644
--- a/src/easy/entities/status.cpp
+++ b/src/easy/entities/status.cpp
@@ -29,6 +29,29 @@ Status::Status()
 : Entity()
 {}
 
+const bool Status::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "id",
+        "uri",
+        "account",
+        "content",
+        "created_at",
+        "emojis",
+        "reblogs_count",
+        "favourites_count",
+        "sensitive",
+        "spoiler_text",
+        "visibility",
+        "media_attachments",
+        "mentions",
+        "tags"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const Easy::Account Status::account() const
 {
     const Json::Value node = get("account");
diff --git a/src/easy/entities/status.hpp b/src/easy/entities/status.hpp
index ab666d7..2da5198 100644
--- a/src/easy/entities/status.hpp
+++ b/src/easy/entities/status.hpp
@@ -73,6 +73,8 @@ namespace Mastodon
          */
         Status();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns an array of matched accounts.
          *  
diff --git a/src/easy/entities/tag.cpp b/src/easy/entities/tag.cpp
index 47dcbfb..1899483 100644
--- a/src/easy/entities/tag.cpp
+++ b/src/easy/entities/tag.cpp
@@ -30,6 +30,17 @@ Tag::Tag()
 : Entity()
 {}
 
+const bool Tag::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "name",
+        "url"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const string Tag::name() const
 {
     return get_string("name");
@@ -66,6 +77,18 @@ Tag::History::History()
 : Entity()
 {}
 
+const bool Tag::History::valid() const
+{
+    const std::vector<string> attributes =
+    {{
+        "day",
+        "uses",
+        "accounts"
+    }};
+
+    return Entity::check_valid(attributes);
+}
+
 const uint_fast64_t Tag::History::accounts()
 {
     return stouint64(get_string("accounts"));
diff --git a/src/easy/entities/tag.hpp b/src/easy/entities/tag.hpp
index a9b10ef..46b9214 100644
--- a/src/easy/entities/tag.hpp
+++ b/src/easy/entities/tag.hpp
@@ -68,6 +68,8 @@ namespace Mastodon
              */
             History();
 
+            virtual const bool valid() const;
+
             /*!
              *  @brief  Returns the number of accounts using that hashtag.
              *  
@@ -106,6 +108,8 @@ namespace Mastodon
          */
         Tag();
 
+        virtual const bool valid() const;
+
         /*!
          *  @brief  Returns the name of the tag
          *  
diff --git a/src/easy/entity.cpp b/src/easy/entity.cpp
index 6d07eaa..79e4cba 100644
--- a/src/easy/entity.cpp
+++ b/src/easy/entity.cpp
@@ -28,7 +28,6 @@ using std::chrono::system_clock;
 
 Easy::Entity::Entity(const string &json)
 : _tree(Json::nullValue)
-, _valid(false)
 ,_was_set(false)
 {
     from_string(json);
@@ -56,10 +55,6 @@ const void Easy::Entity::from_string(const string &json)
         ttdebug << "ERROR: Server returned an error\n";
         ttdebug << "String was: " << json << '\n';
     }
-    else
-    {
-        _valid = true;
-    }
 }
 
 const Json::Value Easy::Entity::to_object() const
@@ -68,13 +63,22 @@ const Json::Value Easy::Entity::to_object() const
 }
 
 Easy::Entity::Entity()
-: _valid(false)
-, _was_set(false)
+: _was_set(false)
 {}
 
-const bool Easy::Entity::valid() const
+const bool
+Easy::Entity::check_valid(const std::vector<string> &attributes) const
 {
-    return _valid;
+    for (const string &attribute: attributes)
+    {
+        get(attribute);
+        if (!was_set())
+        {
+            return false;
+        }
+    }
+
+    return true;
 }
 
 const string Easy::Entity::error() const