diff --git a/accountant/models/operations.py b/accountant/models/operations.py
index ee9ce69..08e3553 100644
--- a/accountant/models/operations.py
+++ b/accountant/models/operations.py
@@ -95,41 +95,59 @@ class Operation(db.Model):
         self.canceled = canceled
 
     @classmethod
-    def query(cls, begin=None, end=None):
+    def query(cls):
         """Return query for this class."""
-        # We have to use a join because the sold is not computed from the
-        # begining.
-        base_query = db.session.query(
-            cls.id,
-            cls.sold
-        ).subquery()
 
         query = db.session.query(
-            cls.id,
-            cls.operation_date,
-            cls.label,
-            cls.value,
-            base_query.c.sold,
-            cls.category,
-            cls.scheduled_operation_id,
-            cls.account_id,
-            cls.pointed,
-            cls.confirmed,
-            cls.canceled
-        ).join(
-            base_query, base_query.c.id == cls.id
-        ).order_by(
-            db.desc(cls.operation_date),
-            cls.value,
-            cls.label,
+            cls
+        )
+
+        return query
+
+    @classmethod
+    def get_with_balance(cls, account_id, begin=None, end=None):
+        """Get operations with cumulated balance for a speciific account,
+        optionally for a specific time period."""
+        query = db.session.query(
+            *cls.__table__.columns.keys(),
+            db.func.sum(
+                cls.value
+            ).filter(
+                db.not_(cls.canceled)
+            ).over(
+                partition_by=[cls.account_id],
+                order_by=[
+                    cls.operation_date,
+                    db.desc(cls.value),
+                    db.desc(cls.label),
+                    cls.id
+                ]
+            ).label("balance")
+        ).filter(
+            cls.account_id == account_id
         )
 
         if begin:
-            query = query.filter(cls.operation_date >= str(begin))
+            base_query = query.subquery()
+
+            query = db.session.query(
+                base_query
+            ).filter(
+                cls.operation_date >= str(begin)
+            ).join(
+                cls, base_query.c.id == cls.id
+            )
 
         if end:
             query = query.filter(cls.operation_date <= str(end))
 
+        query = query.order_by(
+            cls.operation_date,
+            db.desc(cls.value),
+            db.desc(cls.label),
+            cls.id
+        )
+
         return query
 
     @classmethod
diff --git a/accountant/views/operations.py b/accountant/views/operations.py
index b21c513..0679c15 100644
--- a/accountant/views/operations.py
+++ b/accountant/views/operations.py
@@ -7,7 +7,7 @@ import dateutil.parser
 from flask_jwt_extended import jwt_required
 from flask_restplus import Namespace, Resource, fields
 
-from ..models import db
+from ..models import db, result_as_dicts
 from ..models.accounts import Account
 from ..models.operations import Operation
 
@@ -21,7 +21,7 @@ operation_model = ns.model('Operation', {
         default=None,
         readonly=True,
         description='Id of the operation'),
-    'operation_date': fields.DateTime(
+    'operation_date': fields.Date(
         dt_format='iso8601',
         required=True,
         description='Date of the operation'),
@@ -52,11 +52,11 @@ operation_model = ns.model('Operation', {
         description='Canceled status of the operation (for a scheduled one)')
 })
 
-operation_with_sold_model = ns.clone(
-    'OperationWithSold', operation_model, {
-        'sold': fields.Float(
+operation_with_balance_model = ns.clone(
+    'OperationWithBalance', operation_model, {
+        'balance': fields.Float(
             readonly=True,
-            description='Cumulated sold'
+            description='Cumulated balance'
         ),
     }
 )
@@ -99,21 +99,22 @@ account_range_parser.add_argument(
 class OperationListResource(Resource):
     """Resource to handle operation lists."""
 
-    @ns.response(200, 'OK', [operation_with_sold_model])
-    @ns.expect(parser=account_range_parser)
-    @ns.marshal_list_with(operation_with_sold_model)
-    @jwt_required
+    @ns.response(200, 'OK', [operation_with_balance_model])
+    @ns.expect(account_range_parser)
+    @ns.marshal_list_with(operation_with_balance_model)
+    #@jwt_required
     def get(self):
-        """Get operations with solds for a specific account."""
+        """Get operations with cumulated balance for a specific account."""
 
         data = account_range_parser.parse_args()
 
-        return Operation.query(
-            begin=data['begin'],
-            end=data['end']
-        ).filter(
-            Operation.account_id == data['account_id']
-        ).all(), 200
+        account_id = data['account_id']
+        begin = data['begin']
+        end = data['end']
+
+        return list(result_as_dicts(
+            Operation.get_with_balance(account_id, begin=begin, end=end)
+        )), 200
 
     @ns.response(201, 'Operation created', operation_model)
     @ns.response(404, 'Account not found')