diff --git a/swh/web/common/service.py b/swh/web/common/service.py
--- a/swh/web/common/service.py
+++ b/swh/web/common/service.py
@@ -89,6 +89,7 @@
     """
     algo, hash = query.parse_hash(q)
     found = storage.content_find({algo: hash})
+    found = found[0] if found else None
     return {'found': converters.from_content(found),
             'algo': algo}
 
@@ -104,7 +105,7 @@
     """
     algo, hash = query.parse_hash(q)
     found = storage.content_find({algo: hash})
-    return {'found': found is not None}
+    return {'found': bool(found)}
 
 
 def _lookup_content_sha1(q):
@@ -122,7 +123,7 @@
         hashes = storage.content_find({algo: hash})
         if not hashes:
             return None
-        return hashes['sha1']
+        return hashes[0]['sha1']
     return hash
 
 
@@ -718,6 +719,7 @@
                                     directory_entries))}
     elif entity['type'] == 'file':  # content
         content = storage.content_find({'sha1_git': entity['target']})
+        content = content[0] if content else None
         if with_data:
             c = _first_element(storage.content_get([content['sha1']]))
             content['data'] = c['data']
@@ -751,7 +753,7 @@
     if not c:
         raise NotFoundExc('Content with %s checksum equals to %s not found!' %
                           (algo, hashutil.hash_to_hex(hash)))
-    return converters.from_content(c)
+    return converters.from_content(c[0])
 
 
 def lookup_content_raw(q):