diff --git a/plugins/WebMonetization/Entity/Wallet.php b/plugins/WebMonetization/Entity/Wallet.php
new file mode 100644
index 0000000000..8310fa3940
--- /dev/null
+++ b/plugins/WebMonetization/Entity/Wallet.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Plugin\WebMonetization\Entity;
+
+use App\Core\Entity;
+
+class Wallet extends Entity
+{
+    // These tags are meant to be literally included and will be populated with the appropriate fields, setters and getters by `bin/generate_entity_fields`
+    // {{{ Autocode
+    // @codeCoverageIgnoreStart
+    private int $id;
+    private int $actor_id;
+    private string $address;
+
+    public function setId(int $id): self
+    {
+        $this->id = $id;
+        return $this;
+    }
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function setActorId(int $actor_id): self
+    {
+        $this->actor_id = $actor_id;
+        return $this;
+    }
+
+    public function getActorId(): int
+    {
+        return $this->actor_id;
+    }
+
+    public function setAddress(string $address): self
+    {
+        $this->address = mb_substr($address, 0, 255);
+        return $this;
+    }
+
+    public function getAddress(): string
+    {
+        return $this->address;
+    }
+
+    // @codeCoverageIgnoreEnd
+    // }}} Autocode
+    public static function schemaDef()
+    {
+        return [
+            'name'   => 'webmonetizationWallet',
+            'fields' => [
+                'id'       => ['type' => 'serial', 'not null' => true, 'description' => 'unique identifier'],
+                'actor_id' => ['type' => 'int', 'foreign key' => true, 'target' => 'Actor.id', 'multiplicity' => 'one to one', 'not null' => true, 'description' => 'foreign key to actor table'],
+                'address'  => ['type' => 'varchar', 'length' => 255, 'not null' => true, 'description' => 'wallet address'],
+            ],
+            'primary key' => ['id'],
+        ];
+    }
+}
diff --git a/plugins/WebMonetization/Entity/WebMonetization.php b/plugins/WebMonetization/Entity/WebMonetization.php
new file mode 100644
index 0000000000..45600866c9
--- /dev/null
+++ b/plugins/WebMonetization/Entity/WebMonetization.php
@@ -0,0 +1,105 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Plugin\WebMonetization\Entity;
+
+use App\Core\Entity;
+
+class WebMonetization extends Entity
+{
+    // These tags are meant to be literally included and will be populated with the appropriate fields, setters and getters by `bin/generate_entity_fields`
+    // {{{ Autocode
+    // @codeCoverageIgnoreStart
+    private int $id;
+    private int $sender;
+    private int $receiver;
+    private float $sent;
+    private bool $active;
+
+    public function setId(int $id): self
+    {
+        $this->id = $id;
+        return $this;
+    }
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function setSender(int $sender): self
+    {
+        $this->sender = $sender;
+        return $this;
+    }
+
+    public function getSender(): int
+    {
+        return $this->sender;
+    }
+
+    public function setReceiver(int $receiver): self
+    {
+        $this->receiver = $receiver;
+        return $this;
+    }
+
+    public function getReceiver(): int
+    {
+        return $this->receiver;
+    }
+
+    public function setSent(float $sent): self
+    {
+        $this->sent = $sent;
+        return $this;
+    }
+
+    public function getSent(): float
+    {
+        return $this->sent;
+    }
+
+    public function setActive(bool $active): self
+    {
+        $this->active = $active;
+        return $this;
+    }
+
+    public function getActive(): bool
+    {
+        return $this->active;
+    }
+
+    // @codeCoverageIgnoreEnd
+    // }}} Autocode
+    public function getNotificationTargetIds(array $ids_already_known = [], ?int $sender_id = null, bool $include_additional = true): array
+    {
+        if (\array_key_exists('object', $ids_already_known)) {
+            $target_ids = $ids_already_known['object'];
+        } else {
+            $target_ids = [$this->getReceiver()];
+        }
+        // Additional actors that should know about this
+        if ($include_additional && \array_key_exists('additional', $ids_already_known)) {
+            array_push($target_ids, ...$ids_already_known['additional']);
+            return array_unique($target_ids);
+        }
+        return $target_ids;
+    }
+    public static function schemaDef()
+    {
+        return [
+            'name'   => 'webmonetization',
+            'fields' => [
+                'id'       => ['type' => 'serial', 'not null' => true, 'description' => 'unique identifier'],
+                'sender'   => ['type' => 'int', 'foreign key' => true, 'target' => 'Actor.id', 'multiplicity' => 'many to one', 'not null' => true, 'description' => 'actor sending money'],
+                'receiver' => ['type' => 'int', 'foreign key' => true, 'target' => 'Actor.id', 'multiplicity' => 'many to one', 'not null' => true, 'description' => 'actor receiving money'],
+                'sent'     => ['type' => 'float', 'not null' => true, 'description' => 'how much sender has sent to receiver'],
+                'active'   => ['type' => 'bool', 'not null' => true, 'description' => 'whether it should donate'],
+            ],
+            'primary key' => ['id'],
+        ];
+    }
+}
diff --git a/plugins/WebMonetization/WebMonetization.php b/plugins/WebMonetization/WebMonetization.php
new file mode 100644
index 0000000000..f561eef91b
--- /dev/null
+++ b/plugins/WebMonetization/WebMonetization.php
@@ -0,0 +1,221 @@
+<?php
+
+declare(strict_types = 1);
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social 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.
+//
+// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+/**
+ * WebMonetization for GNU social
+ *
+ * @package   GNUsocial
+ * @category  Plugin
+ *
+ * @author    Phablulo <phablulo@gmail.com>
+ * @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace Plugin\WebMonetization;
+
+use App\Core\DB\DB;
+use App\Core\Event;
+use App\Core\Form;
+use function App\Core\I18n\_m;
+use App\Core\Modules\Plugin;
+use App\Entity\Activity;
+use App\Entity\LocalUser;
+use App\Util\Common;
+use App\Util\Exception\RedirectException;
+use App\Util\Formatting;
+use Plugin\WebMonetization\Entity\Wallet;
+use Plugin\WebMonetization\Entity\WebMonetization as Monetization;
+use Symfony\Component\Form\Extension\Core\Type\SubmitType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\HttpFoundation\Request;
+
+class WebMonetization extends Plugin
+{
+    public function onAppendRightPanelBlock($vars, Request $request, &$res): bool
+    {
+        $user = Common::actor();
+        if (\is_null($user)) {
+            return Event::next;
+        }
+        if (\is_null($vars)) {
+            return Event::next;
+        }
+
+        $is_self     = null;
+        $receiver_id = null;
+
+        if ($vars['path'] === 'settings') {
+            $is_self = true;
+        } elseif ($vars['path'] === 'actor_view_nickname') {
+            $is_self = $request->attributes->get('nickname') === $user->getNickname();
+            if (!$is_self) {
+                $receiver_id = DB::findOneBy(LocalUser::class, [
+                    'nickname' => $request->attributes->get('nickname'),
+                ], return_null: true)?->getId();
+            }
+        } elseif ($vars['path'] === 'actor_view_id') {
+            $is_self = $request->attributes->get('id') == $user->getId();
+            if (!$is_self) {
+                $receiver_id = $request->attributes->get('id');
+            }
+        } else {
+            return Event::next;
+        }
+        // if visiting self page, the user will see a form to add, remove or update his wallet
+        if ($is_self) {
+            $wallet = DB::findOneBy(Wallet::class, ['actor_id' => $user->getId()], return_null: true);
+            $form   = Form::create([
+                ['address', TextType::class, [
+                    'label' => _m('Wallet address'),
+                    'attr'  => [
+                        'placeholder'  => _m('Wallet address'),
+                        'autocomplete' => 'off',
+                        'value'        => $wallet?->getAddress(),
+                    ],
+                ]],
+                ['webmonetizationsave', SubmitType::class, [
+                    'label' => _m('Save'),
+                    'attr'  => [
+                        'title' => _m('Save'),
+                    ],
+                ]],
+            ]);
+            $form->handleRequest($request);
+            if ($form->isSubmitted() && $form->isValid()) {
+                if (\is_null($wallet)) {
+                    DB::persist(
+                        Wallet::create([
+                            'actor_id' => $user->getId(),
+                            'address'  => $form->getData()['address'],
+                        ]),
+                    );
+                } else {
+                    $wallet->setAddress($form->getData()['address']);
+                }
+                DB::flush();
+                throw new RedirectException();
+            }
+
+            $res[] = Formatting::twigRenderFile(
+                'WebMonetization/widget.html.twig',
+                ['user' => $user, 'the_form' => $form->createView()],
+            );
+        }
+        // if visiting another user page, the user will see a form to start/stop donating to them
+        else {
+            $entry = DB::findOneBy(Monetization::class, ['sender' => $user->getId(), 'receiver' => $receiver_id], return_null: true);
+            $label = $entry?->getActive() ? _m('Stop donating') : _m('Start donating');
+            $form  = Form::create([
+                ['toggle', SubmitType::class, [
+                    'label' => $label,
+                    'attr'  => [
+                        'title' => $label,
+                    ],
+                ]],
+            ]);
+            $res[] = Formatting::twigRenderFile(
+                'WebMonetization/widget.html.twig',
+                ['user' => $user, 'the_form' => $form->createView()],
+            );
+            $form->handleRequest($request);
+            if ($form->isSubmitted() && $form->isValid()) {
+                if (\is_null($entry)) {
+                    $entry = Monetization::create(
+                        ['sender' => $user->getId(), 'receiver' => $receiver_id, 'active' => true, 'sent' => 0],
+                    );
+                    DB::persist($entry);
+                } else {
+                    $entry->setActive(!$entry->getActive());
+                }
+                DB::flush();
+                // notify receiver!
+                $rwallet = DB::findOneBy(Wallet::class, ['actor_id' => $receiver_id], return_null: true);
+                $message = null;
+                if ($entry->getActive()) {
+                    if ($rwallet?->getAddress()) {
+                        $message = '{nickname} is now donating to you!';
+                    } else {
+                        $message = '{nickname} wants to donate to you. Configure a wallet address to receive donations!';
+                    }
+                    $activity = Activity::create([
+                        'actor_id'    => $user->getId(),
+                        'verb'        => 'offer',
+                        'object_type' => 'webmonetization',
+                        'object_id'   => $entry->getId(),
+                        'source'      => 'web',
+                    ]);
+                } else {
+                    $message = '{nickname} is no longer donating to you.';
+                    // find the old activity ...
+                    $activity = DB::findOneBy(Activity::class, [
+                        'actor_id'    => $user->getId(),
+                        'verb'        => 'offer',
+                        'object_type' => 'webmonetization',
+                        'object_id'   => $entry->getId(),
+                    ], order_by: ['created' => 'DESC']);
+                    // ... and undo it
+                    $activity = Activity::create([
+                        'actor_id'    => $user->getId(),
+                        'verb'        => 'undo',
+                        'object_type' => 'activity',
+                        'object_id'   => $activity->getId(),
+                        'source'      => 'web',
+                    ]);
+                }
+                DB::persist($activity);
+                Event::handle('NewNotification', [
+                    $user,
+                    $activity,
+                    ['object' => [$receiver_id]],
+                    _m($message, ['{nickname}' => $user->getNickname()]),
+                ]);
+                DB::flush();
+                // --
+
+                throw new RedirectException();
+            }
+        }
+        return Event::next;
+    }
+    public function onAppendToHead(Request $request, &$res): bool
+    {
+        $user = Common::actor();
+        if (\is_null($user)) {
+            return Event::next;
+        }
+        // donate to everyone!
+        // Using Javascript, it can be improved to donate only
+        // to actors owning notes rendered on current page.
+        $entries = DB::dql(<<<'EOF'
+                SELECT wallet FROM \Plugin\WebMonetization\Entity\Wallet wallet
+                    INNER JOIN \Plugin\WebMonetization\Entity\WebMonetization wm
+                    WITH wallet.actor_id = wm.receiver
+                WHERE wm.active = :active AND wm.sender = :sender
+            EOF, ['sender' => $user->getId(), 'active' => true]);
+        foreach ($entries as $entry) {
+            $res[] = Formatting::twigRenderString(
+                '<meta name="monetization" content="{{ address }}">',
+                ['address' => $entry->getAddress()],
+            );
+        }
+        return Event::next;
+    }
+}
diff --git a/plugins/WebMonetization/templates/WebMonetization/widget.html.twig b/plugins/WebMonetization/templates/WebMonetization/widget.html.twig
new file mode 100644
index 0000000000..9363a578e7
--- /dev/null
+++ b/plugins/WebMonetization/templates/WebMonetization/widget.html.twig
@@ -0,0 +1,12 @@
+<section class="section-widget">
+    <details class="section-widget-title-details" title="Expand if you want to access more options.">
+        <summary class="section-title-summary">
+            <h2>Web Monetization</h2>
+            {{ icon('arrow-down', 'icon icon-details-open') | raw }}
+        </summary>
+        <fieldset class="section-form">
+            {{ form(the_form) }}
+        </fieldset>
+    </details>
+</section>
+