diff --git a/test/api/v3/integration/chat/POST-chat_seen.test.js b/test/api/v3/integration/chat/POST-chat_seen.test.js
new file mode 100644
index 0000000000..6073fc1204
--- /dev/null
+++ b/test/api/v3/integration/chat/POST-chat_seen.test.js
@@ -0,0 +1,32 @@
+import {
+  createAndPopulateGroup,
+} from '../../../../helpers/api-v3-integration.helper';
+
+describe('POST /groups/:id/chat/seen', () => {
+  let groupWithChat, message, author, member;
+
+  before(async () => {
+    let { group, groupLeader, members } = await createAndPopulateGroup({
+      groupDetails: {
+        type: 'guild',
+        privacy: 'public',
+      },
+      members: 1,
+    });
+
+    groupWithChat = group;
+    author = groupLeader;
+    member = members[0];
+
+    message = await author.post(`/groups/${groupWithChat._id}/chat`, { message: 'Some message' });
+    message = message.message;
+  });
+
+  it('clears new messages', async () => {
+    await member.post(`/groups/${groupWithChat._id}/chat/seen`);
+
+    let userThatHasSeenChat = await member.get('/user');
+
+    expect(userThatHasSeenChat.newMessages).to.be.empty;
+  });
+});
diff --git a/website/src/controllers/api-v3/chat.js b/website/src/controllers/api-v3/chat.js
index 212e064441..bfca7eb3b7 100644
--- a/website/src/controllers/api-v3/chat.js
+++ b/website/src/controllers/api-v3/chat.js
@@ -105,7 +105,7 @@ api.postChat = {
  * @apiSuccess {Array} chat An array of chat messages
  */
 api.likeChat = {
-  method: 'Post',
+  method: 'POST',
   url: '/groups/:groupId/chat/:chatId/like',
   middlewares: [authWithHeaders(), cron],
   async handler (req, res) {
@@ -152,7 +152,7 @@ api.likeChat = {
  * @apiSuccess {Array} chat An array of chat messages
  */
 api.flagChat = {
-  method: 'Post',
+  method: 'POST',
   url: '/groups/:groupId/chat/:chatId/flag',
   middlewares: [authWithHeaders(), cron],
   async handler (req, res) {
@@ -256,4 +256,40 @@ api.flagChat = {
   },
 };
 
+/**
+ * @api {post} /groups/:groupId/chat/:chatId/seen Seen a group chat message
+ * @apiVersion 3.0.0
+ * @apiName SeenChat
+ * @apiGroup Chat
+ *
+ * @apiParam {groupId} groupId The group _id
+ *
+ * @apiSuccess {None}
+ */
+api.seenChat = {
+  method: 'POST',
+  url: '/groups/:groupId/chat/seen',
+  middlewares: [authWithHeaders(), cron],
+  async handler (req, res) {
+    let user = res.locals.user;
+    let groupId = req.params.groupId;
+
+    req.checkParams('groupId', res.t('groupIdRequired')).notEmpty();
+
+    let validationErrors = req.validationErrors();
+    if (validationErrors) throw validationErrors;
+
+    let group = await Group.getGroup({user, groupId});
+    if (!group) throw new NotFound(res.t('groupNotFound'));
+
+    // Skip the auth step, we want this to be fast. If !found with uuid/token, then it just doesn't save
+    let update = { $unset: {} };
+
+    update.$unset[`newMessages.${groupId}`] = '';
+    await User.update({_id: user._id}, update).exec();
+
+    res.respond(200);
+  },
+};
+
 export default api;
diff --git a/website/src/models/group.js b/website/src/models/group.js
index af592bb332..7e7e9c102b 100644
--- a/website/src/models/group.js
+++ b/website/src/models/group.js
@@ -205,7 +205,8 @@ schema.methods.sendChat = function sendChat (message, user) {
     // User.update({'profile.name':{$in:profileNames}},lastSeenUpdate,{multi:true}).exec();
   } else {
     User.update({
-      _id: {$in: this.members, $ne: user ? user._id : ''},
+      guilds: this._id,
+      _id: { $ne: user ? user._id : ''},
     }, lastSeenUpdate, {multi: true}).exec();
   }
 };