Smart Product Currency Conversion API in Laravel – Convert Existing Prices with Ease

In today’s global digital economy, showing product prices in only one currency can limit your business growth. Customers prefer to see prices in their local currency before making a purchase decision. This is where a Product Currency Conversion API in Laravel becomes essential.

This guide explains how to build a clean, scalable, and efficient Laravel API that converts existing product prices from one currency to another. The approach is lightweight, beginner‑friendly, and production‑ready — without relying on third‑party services.

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Why Currency Conversion Matters for Products

A multi‑currency system is no longer optional. It directly impacts user trust, conversion rate, and international reach.

Key Benefits

• Improves user experience for global customers
• Increases sales and checkout confidence
• Reduces cart abandonment
• Works seamlessly with eCommerce platforms
• Supports international SEO strategy

Existing Product Price Conversion

• Your products already have stored prices
• Each product uses a base currency (USD, BDT, EUR, etc.)
• You want to convert prices dynamically via API
• You don’t want external API dependencies

How the Laravel Currency Conversion API Works

The system follows a simple logic:

1. Store product price with base currency
2. Define conversion rates in configuration
3. Call API with target currency
4. Convert price dynamically
5. Return converted price as JSON

This keeps the database clean and avoids unnecessary price duplication.

API Architecture Overview

Product Fields

• Product Name
• Price
• Currency Code

API Output

• Original Price & Currency
• Converted Price
• Target Currency

Products Table (Example)

products
- id
- name
- price
- currency   // USD, BDT, EUR

Currency Rate Config

return [
    'rates' => [
        'USD' => 1,
        'BDT' => 110,
        'EUR' => 0.92,
        'INR' => 83,
    ],
];

Currency Converter Helper

<?php

namespace App\Services;

class CurrencyConverter
{
    public static function convert($amount, $from, $to)
    {
        $rates = config('currency.rates');

        if (!isset($rates[$from]) || !isset($rates[$to])) {
            throw new \Exception('Invalid currency');
        }

        return round(($amount / $rates[$from]) * $rates[$to], 2);
    }
}

API Controller

<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Models\Product;
use App\Services\CurrencyConverter;
use Illuminate\Http\Request;

class ProductCurrencyController extends Controller
{
    public function convert(Request $request, $id)
    {
        $request->validate([
            'to_currency' => 'required|string'
        ]);

        $product = Product::findOrFail($id);

        $convertedPrice = CurrencyConverter::convert(
            $product->price,
            $product->currency,
            strtoupper($request->to_currency)
        );

        return response()->json([
            'product_id' => $product->id,
            'name' => $product->name,
            'original_price' => $product->price,
            'original_currency' => $product->currency,
            'converted_price' => $convertedPrice,
            'converted_currency' => strtoupper($request->to_currency),
        ]);
    }
}

API Route

Route::get('/product/{id}/convert', 
    [ProductCurrencyController::class, 'convert']
);

API Request Example

GET /api/product/5/convert?to_currency=BDT

Response Json

{
  "product_id": 5,
  "name": "Laptop",
  "original_price": 1000,
  "original_currency": "USD",
  "converted_price": 110000,
  "converted_currency": "BDT"
}

Update Converted Price in DB

If you want to save converted price:

$product->price = $convertedPrice;
$product->currency = $request->to_currency;
$product->save();