diff --git a/contrib/buildbot/server.py b/contrib/buildbot/server.py
--- a/contrib/buildbot/server.py
+++ b/contrib/buildbot/server.py
@@ -254,28 +254,30 @@
     def land():
         data = get_json_request_data(request)
 
-        revision = data['revision']
-        if not revision:
+        revision = data.get('revision', None)
+        diff = data.get('diff', None)
+        if not revision and not diff:
+            return FAILURE, 400
+
+        commitMessage = data.get('commitMessage', None)
+        if diff and not commitMessage:
             return FAILURE, 400
 
         # conduitToken is expected to be encrypted and will be decrypted by the
         # land bot.
-        conduitToken = data['conduitToken']
+        conduitToken = data.get('conduitToken', None)
         if not conduitToken:
             return FAILURE, 400
 
-        committerName = data['committerName']
+        committerName = data.get('committerName', None)
         if not committerName:
             return FAILURE, 400
 
-        committerEmail = data['committerEmail']
+        committerEmail = data.get('committerEmail', None)
         if not committerEmail:
             return FAILURE, 400
 
         properties = [{
-            'name': 'env.ABC_REVISION',
-            'value': revision,
-        }, {
             'name': 'env.ABC_CONDUIT_TOKEN',
             'value': conduitToken,
         }, {
@@ -285,6 +287,22 @@
             'name': 'env.ABC_COMMITTER_EMAIL',
             'value': committerEmail,
         }]
+
+        if revision:
+            properties += [{
+                'name': 'env.ABC_REVISION',
+                'value': revision,
+            }]
+
+        if diff:
+            properties += [{
+                'name': 'env.ABC_DIFF',
+                'value': diff,
+            }, {
+                'name': 'env.ABC_COMMIT_MESSAGE',
+                'value': commitMessage,
+            }]
+
         output = tc.trigger_build(
             LANDBOT_BUILD_TYPE,
             'master',
diff --git a/contrib/buildbot/test/test_endpoint_land.py b/contrib/buildbot/test/test_endpoint_land.py
--- a/contrib/buildbot/test/test_endpoint_land.py
+++ b/contrib/buildbot/test/test_endpoint_land.py
@@ -14,7 +14,7 @@
 from testutil import AnyWith
 
 
-class landRequestData(test.mocks.fixture.MockData):
+class landRevisionRequestData(test.mocks.fixture.MockData):
     def __init__(self):
         self.revision = 'D1234'
         self.conduitToken = 'U2FsdGVkX1/RI0AAAAAAAF46wjo3lSAxj1d1iqqkxks='
@@ -22,9 +22,18 @@
         self.committerEmail = 'user@bitcoinabc.org'
 
 
+class landDiffRequestData(test.mocks.fixture.MockData):
+    def __init__(self):
+        self.diff = '12345'
+        self.commitMessage = '[Test] Commit message'
+        self.conduitToken = 'U2FsdGVkX1/RI0AAAAAAAF46wjo3lSAxj1d1iqqkxks='
+        self.committerName = 'User Name'
+        self.committerEmail = 'user@bitcoinabc.org'
+
+
 class EndpointLandTestCase(ABCBotFixture):
-    def test_land_happyPath(self):
-        data = landRequestData()
+    def test_land_revision(self):
+        data = landRevisionRequestData()
         triggerBuildResponse = test.mocks.teamcity.buildInfo(
             test.mocks.teamcity.buildInfo_changes(['test-change']))
         self.teamcity.session.send.return_value = triggerBuildResponse
@@ -38,9 +47,42 @@
                 },
                 'properties': {
                     'property': [{
+                        'name': 'env.ABC_CONDUIT_TOKEN',
+                        'value': 'U2FsdGVkX1/RI0AAAAAAAF46wjo3lSAxj1d1iqqkxks=',
+                    }, {
+                        'name': 'env.ABC_COMMITTER_NAME',
+                        'value': 'User Name',
+                    }, {
+                        'name': 'env.ABC_COMMITTER_EMAIL',
+                        'value': 'user@bitcoinabc.org',
+                    }, {
                         'name': 'env.ABC_REVISION',
                         'value': 'D1234',
                     }, {
+                        'name': 'env.harborMasterTargetPHID',
+                        'value': 'UNRESOLVED',
+                    }],
+                },
+            }),
+        }))
+        assert response.status_code == 200
+        assert response.get_json() == json.loads(triggerBuildResponse.content)
+
+    def test_land_diff(self):
+        data = landDiffRequestData()
+        triggerBuildResponse = test.mocks.teamcity.buildInfo(
+            test.mocks.teamcity.buildInfo_changes(['test-change']))
+        self.teamcity.session.send.return_value = triggerBuildResponse
+        response = self.app.post('/land', headers=self.headers, json=data)
+        self.teamcity.session.send.assert_called_with(AnyWith(requests.PreparedRequest, {
+            'url': 'https://teamcity.test/app/rest/buildQueue',
+            'body': json.dumps({
+                'branchName': 'master',
+                'buildType': {
+                    'id': 'BitcoinAbcLandBot',
+                },
+                'properties': {
+                    'property': [{
                         'name': 'env.ABC_CONDUIT_TOKEN',
                         'value': 'U2FsdGVkX1/RI0AAAAAAAF46wjo3lSAxj1d1iqqkxks=',
                     }, {
@@ -49,6 +91,12 @@
                     }, {
                         'name': 'env.ABC_COMMITTER_EMAIL',
                         'value': 'user@bitcoinabc.org',
+                    }, {
+                        'name': 'env.ABC_DIFF',
+                        'value': '12345',
+                    }, {
+                        'name': 'env.ABC_COMMIT_MESSAGE',
+                        'value': '[Test] Commit message',
                     }, {
                         'name': 'env.harborMasterTargetPHID',
                         'value': 'UNRESOLVED',
@@ -67,14 +115,27 @@
     def test_land_missingArguments(self):
         # Test otherwise valid requests with each required argument missing.
         # All of them should fail with status code 400.
-        requiredArgs = [
+        requiredRevisionArgs = [
             'revision',
             'conduitToken',
             'committerName',
             'committerEmail',
         ]
-        for arg in requiredArgs:
-            data = landRequestData()
+        for arg in requiredRevisionArgs:
+            data = landRevisionRequestData()
+            setattr(data, arg, '')
+            response = self.app.post('/land', headers=self.headers, json=data)
+            assert response.status_code == 400
+
+        requiredDiffArgs = [
+            'diff',
+            'commitMessage',
+            'conduitToken',
+            'committerName',
+            'committerEmail',
+        ]
+        for arg in requiredDiffArgs:
+            data = landDiffRequestData()
             setattr(data, arg, '')
             response = self.app.post('/land', headers=self.headers, json=data)
             assert response.status_code == 400