diff --git a/atproto.py b/atproto.py
index ab1ae2be..a1707da7 100644
--- a/atproto.py
+++ b/atproto.py
@@ -834,3 +834,40 @@ def create_report(cls, input, from_user):
         output = client.com.atproto.moderation.createReport(input)
         logger.info(f'Created report on {mod_host}: {json_dumps(output)}')
         return True
+
+    def send_chat(self, msg, from_user):
+        """Sends a chat message to this user.
+
+        Args:
+          msg (dict): ``chat.bsky.convo.defs#messageInput``
+          from_user (models.User)
+
+        Returns:
+          bool: True if the report was sent successfully, False if the flag's
+            actor is not bridged into ATProto
+        """
+        assert msg['$type'] == 'chat.bsky.convo.defs#messageInput'
+
+        to_did = self.key.id()
+        from_did = from_user.get_copy(ATProto)
+        if not from_did or not from_user.is_enabled(ATProto):
+            return False
+
+        repo = arroba.server.storage.load_repo(from_did)
+
+        chat_host = os.environ['CHAT_HOST']
+        token = service_jwt(host=chat_host,
+                            aud=os.environ['CHAT_DID'],
+                            repo_did=from_did,
+                            privkey=repo.signing_key)
+        client = Client(f'https://{chat_host}', truncate=True, headers={
+                            'User-Agent': USER_AGENT,
+                            'Authorization': f'Bearer {token}',
+                        })
+        convo = client.chat.bsky.convo.getConvoForMembers(members=[to_did])
+        output = client.chat.bsky.convo.sendMessage({
+            'convoId': convo['convo']['id'],
+            'message': msg,
+        })
+        logger.info(f'Sent chat message from {from_user.handle} to {self.handle} {to_did}: {json_dumps(output)}')
+        return True
diff --git a/router.yaml b/router.yaml
index 8ee2bdac..f81647d1 100644
--- a/router.yaml
+++ b/router.yaml
@@ -22,6 +22,9 @@ env_variables:
   BGS_HOST: bsky.network
   MOD_SERVICE_HOST: mod.bsky.app
   MOD_SERVICE_DID: did:plc:ar7c4by46qjdydhdevvrndac
+  # https://bsky.app/profile/gargaj.umlaut.hu/post/3kxsvpqiuln26
+  CHAT_HOST: api.bsky.chat
+  CHAT_DID: did:web:api.bsky.chat
 
 manual_scaling:
   instances: 1
diff --git a/tests/test_atproto.py b/tests/test_atproto.py
index ef9c6c73..e4600fdd 100644
--- a/tests/test_atproto.py
+++ b/tests/test_atproto.py
@@ -1741,6 +1741,55 @@ def test_send_flag_createReport(self, _, mock_post):
                 'Authorization': ANY,
             })
 
+    # sendMessage
+    @patch('requests.post', return_value=requests_response({
+        'id': 'chat456',
+        'rev': '22222222tef2d',
+        'sender': {'did': 'did:plc:user'},
+        'text': 'hello world',
+    }))
+    @patch('requests.get', side_effect=[
+        requests_response({  # getConvoForMembers
+            'convo': {
+                'id': 'convo123',
+                'rev': '22222222fuozt',
+                'members': [{
+                    'did': 'did:plc:alice',
+                    'handle': 'alice.bsky.social',
+                }, {
+                    'did': 'did:plc:user',
+                    'handle': 'handull',
+                }],
+            },
+        }),
+        requests_response(DID_DOC),
+    ])
+    def test_send_chat(self, mock_get, mock_post):
+        user = self.make_user_and_repo()
+        alice = ATProto(id='did:plc:alice')
+
+        self.assertTrue(alice.send_chat({
+            '$type': 'chat.bsky.convo.defs#messageInput',
+            'text': 'hello world',
+        }, from_user=user))
+
+        mock_get.assert_any_call(
+            'https://chat.service.local/xrpc/chat.bsky.convo.getConvoForMembers?members=did%3Aplc%3Aalice',
+            json=None, data=None, headers=ANY)
+        mock_post.assert_called_with(
+            'https://chat.service.local/xrpc/chat.bsky.convo.sendMessage',
+            json={
+                'convoId': 'convo123',
+                'message': {
+                    '$type': 'chat.bsky.convo.defs#messageInput',
+                    'text': 'hello world',
+                },
+            }, data=None, headers={
+                'Content-Type': 'application/json',
+                'User-Agent': common.USER_AGENT,
+                'Authorization': ANY,
+            })
+
     def test_datastore_client_get_record_datastore_object(self):
         self.make_user_and_repo()
         post = {
diff --git a/tests/testutil.py b/tests/testutil.py
index 185d8a40..765b7dce 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -314,6 +314,8 @@ def setUp(self):
             'PLC_HOST': 'plc.local',
             'MOD_SERVICE_HOST': 'mod.service.local',
             'MOD_SERVICE_DID': 'did:mod-service',
+            'CHAT_HOST': 'chat.service.local',
+            'CHAT_DID': 'did:chat-service',
         })
         atproto.appview.address = 'https://appview.local'