diff --git a/app.py b/app.py
index da6dd6c..62ba242 100755
--- a/app.py
+++ b/app.py
@@ -1,10 +1,11 @@
 from datetime import datetime
 
-from flask import Flask, render_template, request, abort
+from flask import Flask, render_template, request, abort, jsonify
 import peewee
 from playhouse.shortcuts import model_to_dict
 
 import database
+import util
 
 app = Flask(__name__)
 app.config["DEBUG"] = True
@@ -105,6 +106,31 @@ def transaction(uuid=None):
     # Default if no method is hit
     abort(400)
 
+@app.route("/transactions/visualize", methods=["GET"])
+def visualize_transactions():
+    args = request.args.to_dict()
+    required_args = ['user_id', 'period', 'date']  # Example date format: '2023-01-25'
+    if not all(arg in args for arg in required_args):
+        abort(400, "Missing required query parameters: user_id, period, date")
+
+    user_id = args['user_id'].strip()
+    period = args['period'].strip()
+    try:
+        date = datetime.strptime(args['date'], '%Y-%m-%d')
+    except ValueError:
+        abort(400, "Invalid date format, use YYYY-MM-DD")
+
+    try:
+        start_date, end_date = util.get_start_end_dates(period, date)
+        result = util.aggregate_transactions_by_category(user_id, start_date, end_date)
+        return jsonify(result)
+    except ValueError as e:
+        abort(400, str(e))
+    except peewee.DoesNotExist:
+        abort(404)
+    except Exception as e:
+        abort(500, str(e))
+
 @app.route("/categories", methods=["GET", "POST"])
 def categories():
     if request.method == "GET":
diff --git a/sql_queries.txt b/sql_queries.txt
new file mode 100644
index 0000000..de66758
--- /dev/null
+++ b/sql_queries.txt
@@ -0,0 +1,9 @@
+SELECT
+    category.name,
+    SUM(transaction.amount) AS total
+FROM "main"."transaction" as transaction
+JOIN "main"."transactioncategory" as category ON transaction.subcategory = category.primary_key
+WHERE transaction.user = 'faab09bcdcc44038907d054ca990a7f4'
+    AND transaction.transaction_date >= '2022-10-01'
+    AND transaction.transaction_date < '2022-11-01'
+GROUP BY category.name;
diff --git a/util.py b/util.py
new file mode 100755
index 0000000..da0e5fe
--- /dev/null
+++ b/util.py
@@ -0,0 +1,33 @@
+from datetime import timedelta
+from peewee import fn
+import database
+
+def get_start_end_dates(period, date):
+    if period == 'daily':
+        start_date = date
+        end_date = date + timedelta(days=1)
+    elif period == 'weekly':
+        start_date = date - timedelta(days=date.weekday())
+        end_date = start_date + timedelta(days=7)
+    elif period == 'monthly':
+        start_date = date.replace(day=1)
+        next_month = start_date + timedelta(days=32)
+        end_date = next_month.replace(day=1)
+    elif period == 'yearly':
+        start_date = date.replace(day=1, month=1)
+        end_date = start_date.replace(year=start_date.year + 1)
+    else:
+        raise ValueError("Invalid period specified")
+    
+    return start_date, end_date
+
+def aggregate_transactions_by_category(user_id, start_date, end_date):
+    query = (database.Transaction
+                    .select(database.TransactionCategory.name, fn.SUM(database.Transaction.amount).alias('total'))
+                    .join(database.TransactionCategory, on=(database.Transaction.subcategory == database.TransactionCategory.primary_key))
+                    .where(
+                        (database.Transaction.user == user_id) &
+                        (database.Transaction.transaction_date >= start_date) &
+                        (database.Transaction.transaction_date < end_date))
+                    .group_by(database.TransactionCategory.name))
+    return [{transaction.subcategory.name: transaction.total} for transaction in query]
\ No newline at end of file