diff --git a/composer.json b/composer.json
index ce7dfb195..1fd6f9f31 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,8 @@
   "description": "Desafio para candidatos a back-end.",
   "type": "project",
   "require": {
-    "php": ">= 7.4"
+    "php": ">= 7.4",
+    "ext-json": "*"
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.4",
diff --git a/index.php b/index.php
index 249b94af4..f547f5a04 100644
--- a/index.php
+++ b/index.php
@@ -8,11 +8,26 @@
  *
  * @category Challenge
  * @package  Back-end
- * @author   Seu Nome <seu-email@seu-provedor.com>
+ * @author   Leonardo Mazza de Souza <desenvolvedormazza@gmail.com>
  * @license  http://opensource.org/licenses/MIT MIT
  * @link     https://github.com/apiki/back-end-challenge
  */
-declare(strict_types=1);
+
+
+use App\CurrencyConvertion;
 
 require __DIR__ . '/vendor/autoload.php';
 
+$allowedCurrency    = ['BRL' => 'R$','USD' => '$','EUR' => '€'];
+$urlParams = array_filter(explode('/', $_SERVER['REQUEST_URI']));
+
+$amount     = !empty($urlParams[2]) ? (double) $urlParams[2] : NULL;
+$rate       = !empty($urlParams[5]) ? (double) $urlParams[5] : NULL;
+
+$from           = !empty($urlParams[3]) ? $urlParams[3] : NULL;
+$to             = !empty($urlParams[4]) ? $urlParams[4] : '';
+$exchangeUrl    = !empty($urlParams[1]) && $urlParams[1] == 'exchange';
+
+$object = new CurrencyConvertion;
+$object->convert($amount, $from, $to, $rate, $allowedCurrency, $exchangeUrl);
+echo json_encode($object);
diff --git a/src/CurrencyConvertion.php b/src/CurrencyConvertion.php
new file mode 100644
index 000000000..f9c702219
--- /dev/null
+++ b/src/CurrencyConvertion.php
@@ -0,0 +1,71 @@
+<?php
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * Este será o arquivo chamado na execução dos testes automátizados.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Leonardo Mazza de Souza <desenvolvedormazza@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+
+namespace App;
+
+/**
+ * CurrencyConvertion.
+ *
+ * PHP version 7.4
+ *
+ * Classe responsável pela conversão.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Leonardo Mazza de Souza <desenvolvedormazza@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+class CurrencyConvertion
+{
+    public $valorConvertido;
+    public $simboloMoeda;
+
+    /**
+     * Convert.
+     *
+     * PHP version 7.4
+     *
+     * Função responsável pela conversão.
+     *
+     * @param $amount          double Recebe a quantia
+     * @param $from            string De
+     * @param $to              string Para
+     * @param $rate            double Taxa de Conversão
+     * @param $allowedCurrency array  Conversões Permitidas
+     * @param $url             string Exchange Url
+     *
+     * @return int
+     */
+    public function convert($amount, $from, $to, $rate, $allowedCurrency, $url)
+    {
+        if ($amount < 0
+            || $rate < 0
+            || empty($amount)
+            || empty($rate)
+            || empty($from)
+            || empty($to)
+            || empty($url)
+            || array_key_exists($from, $allowedCurrency) === false
+            || array_key_exists($to, $allowedCurrency) === false
+        ) {
+            return http_response_code(400);
+        }
+
+        $this->valorConvertido = $amount * $rate;
+        $this->simboloMoeda = $allowedCurrency[$to];
+        return http_response_code(200);
+    }
+}