diff --git a/src/Exchange/ExchangeConfig.php b/src/Exchange/ExchangeConfig.php
new file mode 100644
index 00000000..4808c3ca
--- /dev/null
+++ b/src/Exchange/ExchangeConfig.php
@@ -0,0 +1,55 @@
+<?php
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * Este arquivo contém as constantes e mensagens de erro.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Kayo Almondes Tusthler <kayotusthler@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+
+declare(strict_types=1);
+
+namespace App\Exchange;
+
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * Esta classe é responsável por configurar as constantes e mensagens de erro.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Kayo Almondes Tusthler <kayotusthler@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+class ExchangeConfig
+{
+    public const ROUTE = 'exchange';
+
+    public const SIGN_SYMBOL = [
+        'BRL' => 'R$',
+        'EUR' => '€',
+        'USD' => '$'
+    ];
+
+    public const PERMITTED_CURRENCIES = [
+        'BRL',
+        'EUR',
+        'USD'
+    ];
+
+    public const ERROR_MESSAGES = [
+        'INVALID_AMOUNT'   => 'Valor invalido > 0',
+        'INVALID_CURRENCY' => 'Moedas validas: USD, BRL, EUR',
+        'INVALID_RATE'     => 'Taxa invalida. Use: > 0',
+        'INVALID_ROUTE'    => 'Rota válida: /exchange/{amount}/{from}/{to}/{rate}'
+    ];
+}
diff --git a/src/Exchange/ExchangeHandler.php b/src/Exchange/ExchangeHandler.php
new file mode 100644
index 00000000..b786124c
--- /dev/null
+++ b/src/Exchange/ExchangeHandler.php
@@ -0,0 +1,155 @@
+<?php
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * Este arquivo lida com a requisição
+ * e retorna o resultado da conversão de moedas.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Kayo Almondes Tusthler <kayotusthler@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+
+declare(strict_types=1);
+
+namespace App\Exchange;
+
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * Esta classe lida com a requisição
+ * e retorna o resultado da conversão de moedas.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   Kayo Almondes Tusthler <kayotusthler@gmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/apiki/back-end-challenge
+ */
+class ExchangeHandler
+{
+    private const PARAM_AMOUNT = 1;
+    private const PARAM_FROM   = 2;
+    private const PARAM_TO     = 3;
+    private const PARAM_RATE   = 4;
+
+    /**
+     * Lida com a requisição
+     * e retorna o resultado da conversão de moedas.
+     *
+     * @param string $requestUri URL da requisição
+     *
+     * @return void
+     */
+    public function handle(string $requestUri): void
+    {
+        $parts = $this->_parsePath($requestUri);
+
+        if (count($parts) !== 5) :
+            $this->_respondError(
+                400,
+                ExchangeConfig::ERROR_MESSAGES['INVALID_ROUTE']
+            );
+        endif;
+
+        if ($parts[0] !== ExchangeConfig::ROUTE) :
+            $this->_respondError(
+                404,
+                ExchangeConfig::ERROR_MESSAGES['INVALID_ROUTE']
+            );
+        endif;
+
+        if (!is_numeric($parts[self::PARAM_AMOUNT])
+            || (float) $parts[self::PARAM_AMOUNT] <= 0
+        ) :
+            $this->_respondError(
+                400,
+                ExchangeConfig::ERROR_MESSAGES['INVALID_AMOUNT']
+            );
+        endif;
+
+        if (!is_numeric($parts[self::PARAM_RATE])
+            || (float) $parts[self::PARAM_RATE] <= 0
+        ) :
+            $this->_respondError(
+                400,
+                ExchangeConfig::ERROR_MESSAGES['INVALID_RATE']
+            );
+        endif;
+
+        $from = trim($parts[self::PARAM_FROM]);
+        $to   = trim($parts[self::PARAM_TO]);
+
+        if (!in_array($from, ExchangeConfig::PERMITTED_CURRENCIES, true)
+            || !in_array($to, ExchangeConfig::PERMITTED_CURRENCIES, true)
+        ) :
+            $this->_respondError(
+                400,
+                ExchangeConfig::ERROR_MESSAGES['INVALID_CURRENCY']
+            );
+        endif;
+
+        $amount = (float) trim($parts[self::PARAM_AMOUNT]);
+        $rate   = (float) trim($parts[self::PARAM_RATE]);
+        $result = $amount * $rate;
+
+        $this->_respondSuccess(
+            [
+            'valorConvertido' => round($result, 2),
+            'simboloMoeda' => ExchangeConfig::SIGN_SYMBOL[$to],
+            ]
+        );
+    }
+
+    /**
+     * Analisa a URL da requisição
+     * e retorna os parâmetros.
+     *
+     * @param string $requestUri URL da requisição
+     *
+     * @return array
+     */
+    private function _parsePath(string $requestUri): array
+    {
+        $path = parse_url($requestUri, PHP_URL_PATH);
+
+        if (!is_string($path)) :
+            return [];
+        endif;
+
+        return explode('/', trim($path, '/'));
+    }
+
+    /**
+     * Função que envia a resposta de erro.
+     *
+     * @param int    $statusCode Código de status da resposta
+     * @param string $message    Mensagem de erro
+     *
+     * @return void
+     */
+    private function _respondError(int $statusCode, string $message): void
+    {
+        http_response_code($statusCode);
+        echo json_encode(['erro' => $message]);
+        exit;
+    }
+
+    /**
+     * Função que envia a resposta de sucesso.
+     *
+     * @param array $payload Payload da resposta
+     *
+     * @return void
+     */
+    private function _respondSuccess(array $payload): void
+    {
+        echo json_encode($payload);
+    }
+}
diff --git a/src/index.php b/src/index.php
index 92841bc8..b87f510b 100644
--- a/src/index.php
+++ b/src/index.php
@@ -8,7 +8,7 @@
  *
  * @category Challenge
  * @package  Back-end
- * @author   Seu Nome <seu-email@seu-provedor.com>
+ * @author   Kayo Almondes Tusthler <kayotusthler@gmail.com>
  * @license  http://opensource.org/licenses/MIT MIT
  * @link     https://github.com/apiki/back-end-challenge
  */
@@ -16,3 +16,9 @@
 
 require __DIR__ . '/../vendor/autoload.php';
 
+use App\Exchange\ExchangeHandler;
+
+header('Content-Type: application/json');
+
+$handler = new ExchangeHandler();
+$handler->handle($_SERVER['REQUEST_URI']);