diff --git a/hubstorage/frontier.py b/hubstorage/frontier.py
index 6f74451..b37cacc 100644
--- a/hubstorage/frontier.py
+++ b/hubstorage/frontier.py
@@ -63,3 +63,21 @@ def delete(self, frontier, slot, ids):
 
     def delete_slot(self, frontier, slot):
         self.apidelete((frontier, 's', slot))
+
+    def count_slot(self, frontier, slot):
+        total = {
+            'count': 0,
+            'scanned': 0,
+        }
+        start = None
+        while True:
+            ret = list(self.apiget(
+                (frontier, 's', slot, 'q/count'),
+                params={'start': start}
+            ))
+            total['count'] += ret[0]['count']
+            total['scanned'] += ret[0]['scanned']
+            start = ret[0].get('nextstart')
+            if not start:
+                break
+        return total
diff --git a/tests/test_frontier.py b/tests/test_frontier.py
index e781377..b0d173c 100644
--- a/tests/test_frontier.py
+++ b/tests/test_frontier.py
@@ -41,6 +41,7 @@ def test_add_read(self):
     def test_add_multiple_chunks(self):
         frontier = self.project.frontier
         old_count = frontier.newcount
+        initial_count = frontier.count_slot(self.frontier, self.slot)
 
         batch_size = 50
         fps1 = [{'fp': '/index_%s.html' % fp} for fp in range(0, batch_size)]
@@ -55,6 +56,10 @@ def test_add_multiple_chunks(self):
 
         self.assertEqual(frontier.newcount, 150 + old_count)
 
+        # test count_slot
+        count = frontier.count_slot(self.frontier, self.slot)
+        self.assertEqual(count['count'] - initial_count['count'], 150)
+
         # insert repeated fingerprints
         fps4 = [{'fp': '/index_%s.html' % fp} for fp in range(0, batch_size)]
         frontier.add(self.frontier, self.slot, fps3)
@@ -73,6 +78,10 @@ def test_add_multiple_chunks(self):
         ids = [batch['id'] for batch in batches]
         frontier.delete(self.frontier, self.slot, ids)
 
+        # test count_slot again
+        count = frontier.count_slot(self.frontier, self.slot)
+        self.assertEqual(count['count'] - initial_count['count'], 150 - 100)
+
         # get remaining 50
         batches = list(frontier.read(self.frontier, self.slot))
         urls = [self._get_urls(batch) for batch in batches]