diff --git a/config/urls.py b/config/urls.py
index ee86e23..ffeecb9 100644
--- a/config/urls.py
+++ b/config/urls.py
@@ -24,6 +24,7 @@ urlpatterns = (
         path("admin/", admin.site.urls),
         path("", include("market.urls")),
         path("user/", include("user.urls")),
+        path("graph/", include("graph.urls")),
     ]
     + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
     + static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
diff --git a/graph/admin.py b/graph/admin.py
index 8c38f3f..aef6443 100644
--- a/graph/admin.py
+++ b/graph/admin.py
@@ -1,3 +1,6 @@
 from django.contrib import admin
 
-# Register your models here.
+from .models import Transaction, MonthlyTransaction
+
+admin.site.register(Transaction)
+admin.site.register(MonthlyTransaction)
diff --git a/graph/methods.py b/graph/methods.py
new file mode 100644
index 0000000..175ceaf
--- /dev/null
+++ b/graph/methods.py
@@ -0,0 +1,55 @@
+from django.db.models import Avg
+from django.utils import timezone
+
+from graph.models import Transaction, MonthlyTransaction
+from market.models import Product
+
+
+def create_transaction(post):
+    transaction = Transaction.objects.create(
+        product=post.product, price=post.price
+    )
+    return transaction
+
+
+def get_average_price(transactions):
+    average = transactions.aggregate(Avg("price"))["price__avg"] or 0
+    return round(average, -2)
+
+
+def create_monthly_transaction():
+    year = timezone.now().year
+    month = timezone.now().month
+    products = Product.objects.all()
+    for product in products:
+        if MonthlyTransaction.objects.filter(
+            product=product, year=year, month=month
+        ).exists():
+            continue
+        transactions = Transaction.objects.filter(product=product)
+        if transactions:
+            price = get_average_price(transactions)
+            MonthlyTransaction.objects.create(
+                product=product,
+                year=year,
+                month=month,
+                price=price,
+            )
+
+
+def create_monthly_transaction_by_product(product):
+    year = timezone.now().year
+    month = timezone.now().month
+    if MonthlyTransaction.objects.filter(
+        product=product, year=year, month=month
+    ).exists():
+        return
+    transactions = Transaction.objects.filter(product=product)
+    if transactions:
+        price = get_average_price(transactions)
+        MonthlyTransaction.objects.create(
+            product=product,
+            year=year,
+            month=month,
+            price=price,
+        )
diff --git a/graph/serializers.py b/graph/serializers.py
new file mode 100644
index 0000000..2743338
--- /dev/null
+++ b/graph/serializers.py
@@ -0,0 +1,16 @@
+# from rest_framework import serializers
+from rest_framework.serializers import ModelSerializer
+
+from graph.models import Transaction, MonthlyTransaction
+
+
+class TransactionSerializer(ModelSerializer):
+    class Meta:
+        model = Transaction
+        fields = ("id", "product", "price", "created_at")
+
+
+class MonthlyTransactionSerializer(ModelSerializer):
+    class Meta:
+        model = MonthlyTransaction
+        fields = ("year", "month", "price")
diff --git a/graph/urls.py b/graph/urls.py
new file mode 100644
index 0000000..c8c6fb1
--- /dev/null
+++ b/graph/urls.py
@@ -0,0 +1,20 @@
+from django.conf import settings
+
+from rest_framework import routers
+
+from .viewsets import (
+    GraphViewset,
+    MonthlyTransactionViewset,
+    TransactionViewset,
+)
+
+if settings.DEBUG:
+    router = routers.DefaultRouter()
+else:
+    router = routers.SimpleRouter()
+
+router.register("g", GraphViewset)
+router.register("t", TransactionViewset)
+router.register("m", MonthlyTransactionViewset)
+
+urlpatterns = router.urls
diff --git a/graph/views.py b/graph/views.py
deleted file mode 100644
index 91ea44a..0000000
--- a/graph/views.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from django.shortcuts import render
-
-# Create your views here.
diff --git a/graph/viewsets.py b/graph/viewsets.py
new file mode 100644
index 0000000..f92d66c
--- /dev/null
+++ b/graph/viewsets.py
@@ -0,0 +1,48 @@
+from rest_framework.decorators import action
+from rest_framework.permissions import AllowAny
+from rest_framework.response import Response
+from rest_framework.viewsets import ReadOnlyModelViewSet, GenericViewSet
+
+from core.mixins import ActionBasedMixin
+from graph.models import Transaction, MonthlyTransaction
+from graph.serializers import (
+    TransactionSerializer,
+    MonthlyTransactionSerializer,
+)
+from market.models import Product
+
+
+class TransactionViewset(ActionBasedMixin, ReadOnlyModelViewSet):
+    queryset = Transaction.objects.all().select_related("product")
+    serializer_class = TransactionSerializer
+    permission_classes = [AllowAny]
+
+    @action(detail=False, methods=["GET"])
+    def monthly(self, request):
+        queryset = MonthlyTransaction.objects.all()
+
+        page = self.paginate_queryset(queryset)
+        if page is not None:
+            serializer = MonthlyTransactionSerializer(page, many=True)
+            return self.get_paginated_response(serializer.data)
+
+        serializer = MonthlyTransactionSerializer(queryset, many=True)
+        return Response(serializer.data)
+
+
+class MonthlyTransactionViewset(ActionBasedMixin, ReadOnlyModelViewSet):
+    queryset = MonthlyTransaction.objects.all().select_related("product")
+    serializer_class = MonthlyTransactionSerializer
+    permission_classes = [AllowAny]
+
+
+class GraphViewset(ActionBasedMixin, GenericViewSet):
+    queryset = Product.objects.all()
+    queryset_map = {}
+    serializer_class = MonthlyTransactionSerializer
+
+    def retrieve(self, request, *args, **kwargs):
+        product = self.get_object()
+        data = reversed(MonthlyTransaction.objects.filter(product=product)[:6])
+        serializer = self.get_serializer(data, many=True)
+        return Response(serializer.data)