diff --git a/app/api/expenses.tsx b/app/api/expenses.tsx
index a23cd16..b3929bf 100644
--- a/app/api/expenses.tsx
+++ b/app/api/expenses.tsx
@@ -1,40 +1,40 @@
-/* Copyright (C) 2024 Manuel Bustillo*/
+// /* Copyright (C) 2024 Manuel Bustillo*/
 
-import { Expense } from '@/app/lib/definitions';
-import { getCsrfToken, getSlug } from '@/app/lib/utils';
+// import { Expense } from '@/app/lib/definitions';
+// import { getCsrfToken, getSlug } from '@/app/lib/utils';
 
-export function loadExpenses(onLoad?: (expenses: Expense[]) => void) {
-  fetch(`/api/${getSlug()}/expenses`)
-    .then((response) => response.json())
-    .then((data) => {
-      onLoad && onLoad(data.map((record: any) => {
-        return ({
-          id: record.id,
-          name: record.name,
-          amount: record.amount,
-          pricingType: record.pricing_type
-        });
-      }));
-    }, (error) => {
-      return [];
-    });
-}
+// export function loadExpenses(onLoad?: (expenses: Expense[]) => void) {
+//   fetch(`/api/${getSlug()}/expenses`)
+//     .then((response) => response.json())
+//     .then((data) => {
+//       onLoad && onLoad(data.map((record: any) => {
+//         return ({
+//           id: record.id,
+//           name: record.name,
+//           amount: record.amount,
+//           pricingType: record.pricing_type
+//         });
+//       }));
+//     }, (error) => {
+//       return [];
+//     });
+// }
 
-export function updateExpense(expense: Expense) {
-  fetch(`/api/${getSlug()}/expenses/${expense.id}`,
-    {
-      method: 'PUT',
-      body: JSON.stringify({
-        expense: {
-          name: expense.name,
-          amount: expense.amount,
-          pricing_type: expense.pricingType,
-        }
-      }),
-      headers: {
-        'Content-Type': 'application/json',
-        'X-CSRF-TOKEN': getCsrfToken(),
-      }
-    })
-    .catch((error) => console.error(error));
-}
\ No newline at end of file
+// export function updateExpense(expense: Expense) {
+//   fetch(`/api/${getSlug()}/expenses/${expense.id}`,
+//     {
+//       method: 'PUT',
+//       body: JSON.stringify({
+//         expense: {
+//           name: expense.name,
+//           amount: expense.amount,
+//           pricing_type: expense.pricingType,
+//         }
+//       }),
+//       headers: {
+//         'Content-Type': 'application/json',
+//         'X-CSRF-TOKEN': getCsrfToken(),
+//       }
+//     })
+//     .catch((error) => console.error(error));
+// }
\ No newline at end of file
diff --git a/app/lib/definitions.ts b/app/lib/definitions.ts
index 4968e24..ab27eeb 100644
--- a/app/lib/definitions.ts
+++ b/app/lib/definitions.ts
@@ -6,12 +6,12 @@ export interface Entity {
   id?: string;
 }
 
-export type Expense = {
-  id: string;
-  name: string;
-  amount: number;
-  pricingType: 'fixed' | 'per person';
-};
+// export type Expense = {
+//   id: string;
+//   name: string;
+//   amount: number;
+//   pricingType: 'fixed' | 'per person';
+// };
 
 export type TableArrangement = {
   id: string;
diff --git a/app/lib/expense.tsx b/app/lib/expense.tsx
new file mode 100644
index 0000000..a402623
--- /dev/null
+++ b/app/lib/expense.tsx
@@ -0,0 +1,39 @@
+import { Serializable } from "../api/abstract-api";
+import { Entity } from "./definitions";
+
+export const pricingTypes = ['fixed', 'per person'] as const;
+export type PricingType = typeof pricingTypes[number];
+
+export class Expense implements Entity {
+  id?: string;
+  name: string;
+  amount: number;
+  pricingType: PricingType;
+
+  constructor(id?: string, name?: string, amount?: number, pricingType?: PricingType) {
+    this.id = id;
+    this.name = name || '';
+    this.amount = amount || 0;
+    this.pricingType = pricingType || 'fixed';
+  }
+}
+
+export class ExpenseSerializer implements Serializable<Expense>{
+  fromJson(data: any): Expense {
+    return new Expense(data.id, data.name, data.amount, data.pricing_type);
+  }
+
+  toJson(expense: Expense): string {
+    return JSON.stringify({
+      expense: {
+        name: expense.name,
+        amount: expense.amount,
+        pricing_type: expense.pricingType
+      }
+    });
+  }
+
+  apiPath(): string {
+    return 'expenses';
+  }
+}
\ No newline at end of file
diff --git a/app/ui/expenses/table.tsx b/app/ui/expenses/table.tsx
index 121990c..0d68005 100644
--- a/app/ui/expenses/table.tsx
+++ b/app/ui/expenses/table.tsx
@@ -2,18 +2,19 @@
 
 'use client'
 
-import { loadExpenses, updateExpense } from '@/app/api/expenses';
-import { Expense } from '@/app/lib/definitions';
 import { useState } from "react";
 import InlineTextField from "../components/form/inlineTextField";
 import TableOfContents from "../components/table-of-contents";
+import { AbstractApi } from '@/app/api/abstract-api';
+import { Expense, ExpenseSerializer } from '@/app/lib/expense';
 
 export default function ExpensesTable() {
   const [expenses, setExpenses] = useState<Array<Expense>>([]);
   const [expensesLoaded, setExpensesLoaded] = useState(false);
 
+
   function refreshExpenses() {
-    loadExpenses((expenses) => {
+    new AbstractApi<Expense>().getAll(new ExpenseSerializer(), (expenses: Expense[]) => {    
       setExpenses(expenses);
       setExpensesLoaded(true);
     });
@@ -21,6 +22,9 @@ export default function ExpensesTable() {
 
   !expensesLoaded && refreshExpenses();
 
+  const api = new AbstractApi<Expense>();
+  const serializer = new ExpenseSerializer();
+
   return (
     <TableOfContents
       headers={['Name', 'Amount (€)', 'Pricing Type']}