diff --git a/src/API/Endpoints/Endpoint.php b/src/API/Endpoints/Endpoint.php
index 5754031..5d4d002 100644
--- a/src/API/Endpoints/Endpoint.php
+++ b/src/API/Endpoints/Endpoint.php
@@ -4,6 +4,8 @@
 
 use InvalidArgumentException;
 use YouCan\Pay\API\APIServiceInterface;
+use YouCan\Pay\API\Exceptions\Keys\UnsetPrivateKeyException;
+use YouCan\Pay\API\Exceptions\Keys\UnsetPublicKeyException;
 
 abstract class Endpoint
 {
@@ -35,14 +37,14 @@ protected function createEndpoint(): string
     protected function assertPrivateKeyIsSet(): void
     {
         if ($this->apiService->getPrivateKey() === null) {
-            throw new InvalidArgumentException("private key not set");
+            throw new UnsetPrivateKeyException("private key not set");
         }
     }
 
     protected function assertPublicKeyIsSet(): void
     {
         if ($this->apiService->getPublicKey() === null) {
-            throw new InvalidArgumentException("public key not set");
+            throw new UnsetPublicKeyException("public key not set");
         }
     }
 }
diff --git a/src/API/Endpoints/KeysEndpoint.php b/src/API/Endpoints/KeysEndpoint.php
index a1cc167..5e5fa2b 100644
--- a/src/API/Endpoints/KeysEndpoint.php
+++ b/src/API/Endpoints/KeysEndpoint.php
@@ -3,6 +3,7 @@
 namespace YouCan\Pay\API\Endpoints;
 
 use YouCan\Pay\API\Exceptions\InvalidResponseException;
+use YouCan\Pay\API\Exceptions\ServerException;
 use YouCan\Pay\API\Response;
 
 class KeysEndpoint extends Endpoint
@@ -13,7 +14,7 @@ class KeysEndpoint extends Endpoint
      * @param string|null $privateKey
      * @param string|null $publicKey
      * @return bool
-     * @throws InvalidResponseException
+     * @throws ServerException
      */
     public function check(?string $privateKey = null, ?string $publicKey = null): bool
     {
@@ -40,7 +41,7 @@ protected function endpoint(): string
     /**
      * @param Response $response
      * @return bool
-     * @throws InvalidResponseException
+     * @throws ServerException
      */
     private function assertResponse(Response $response): bool
     {
@@ -49,10 +50,10 @@ private function assertResponse(Response $response): bool
         }
 
         if ($response->getStatusCode() >= 500 && $response->getStatusCode() < 600) {
-            throw new InvalidResponseException(
-                $response->getStatusCode(),
+            throw new ServerException(
+                'internal error from server. Support has been notified. Please try again!',
                 json_encode($response->getResponse()),
-                'internal error from server. Support has been notified. Please try again!'
+                $response->getStatusCode(),
             );
         }
 
diff --git a/src/API/Endpoints/TokenEndpoint.php b/src/API/Endpoints/TokenEndpoint.php
index 5427d48..38356c7 100644
--- a/src/API/Endpoints/TokenEndpoint.php
+++ b/src/API/Endpoints/TokenEndpoint.php
@@ -2,8 +2,10 @@
 
 namespace YouCan\Pay\API\Endpoints;
 
-use InvalidArgumentException;
-use YouCan\Pay\API\Exceptions\InvalidResponseException;
+use YouCan\Pay\API\Exceptions\ServerException;
+use YouCan\Pay\API\Exceptions\Token\MissingTokenException;
+use YouCan\Pay\API\Exceptions\UnexpectedResultException;
+use YouCan\Pay\API\Exceptions\UnsupportedResponseException;
 use YouCan\Pay\API\Exceptions\ValidationException;
 use YouCan\Pay\API\Response;
 use YouCan\Pay\Models\Token;
@@ -51,16 +53,16 @@ protected function endpoint(): string
     /**
      * @param Response $response
      *
-     * @throws ValidationException|InvalidArgumentException
+     * @throws MissingTokenException|ValidationException|UnexpectedResultException|ServerException|UnsupportedResponseException
      */
     private function assertResponse(Response $response): void
     {
         if ($response->getStatusCode() === 200) {
             if (!is_array($response->get('token')) || !is_string($response->get('token')['id'])) {
-                throw new InvalidResponseException(
-                    $response->getStatusCode(),
+                throw new MissingTokenException(
+                    'missing token in response. Please try again or contact support',
                     json_encode($response->getResponse()),
-                    'missing token in response. Please try again or contact support'
+                    $response->getStatusCode(),
                 );
             }
 
@@ -69,34 +71,42 @@ private function assertResponse(Response $response): void
 
         if ($response->getStatusCode() === 404) {
             if ($response->get('success') === false && is_string($response->get('message'))) {
-                throw new ValidationException((string)$response->get('message'));
+                throw new ValidationException(
+                    (string)$response->get('message'),
+                    json_encode($response->getResponse()),
+                    $response->getStatusCode(),
+                );
             }
         }
 
         if ($response->getStatusCode() === 422) {
             if ($response->get('success') === false && is_string($response->get('message'))) {
-                throw new ValidationException((string)$response->get('message'));
+                throw new ValidationException(
+                    (string)$response->get('message'),
+                    json_encode($response->getResponse()),
+                    $response->getStatusCode(),
+                );
             }
 
-            throw new InvalidResponseException(
-                $response->getStatusCode(),
+            throw new UnexpectedResultException(
+                'got unexpected result from server. Validation response with wrong payload',
                 json_encode($response->getResponse()),
-                'got unexpected result from server. Validation response with wrong payload'
+                $response->getStatusCode()
             );
         }
 
         if ($response->getStatusCode() >= 500 && $response->getStatusCode() < 600) {
-            throw new InvalidResponseException(
-                $response->getStatusCode(),
+            throw new ServerException(
+                'internal error from server. Support has been notified. Please try again!',
                 json_encode($response->getResponse()),
-                'internal error from server. Support has been notified. Please try again!'
+                $response->getStatusCode(),
             );
         }
 
-        throw new InvalidResponseException(
-            $response->getStatusCode(),
+        throw new UnsupportedResponseException(
+            'not supported status code from the server.',
             json_encode($response->getResponse()),
-            'not supported status code from the server.'
+            $response->getStatusCode(),
         );
     }
 }
diff --git a/src/API/Exceptions/BaseException.php b/src/API/Exceptions/BaseException.php
new file mode 100644
index 0000000..3362af8
--- /dev/null
+++ b/src/API/Exceptions/BaseException.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions;
+
+use Throwable;
+
+class BaseException extends \RuntimeException
+{
+    /** @var string|null */
+    protected $response;
+
+    public function __construct(
+        string $message,
+        string $response = null,
+        int $code = 0,
+        Throwable $previous = null
+    ) {
+        parent::__construct($message, $code, $previous);
+
+        $this->response = $response;
+    }
+
+    public function getResponse()
+    {
+        return $this->response;
+    }
+
+    public function hasResponse(): bool
+    {
+        return $this->response !== null;
+    }
+}
diff --git a/src/API/Exceptions/ClientException.php b/src/API/Exceptions/ClientException.php
new file mode 100644
index 0000000..30d79af
--- /dev/null
+++ b/src/API/Exceptions/ClientException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions;
+
+/**
+ * Exception when a client error is encountered (4xx codes)
+ */
+class ClientException extends BaseException
+{
+}
diff --git a/src/API/Exceptions/Keys/UnsetPrivateKeyException.php b/src/API/Exceptions/Keys/UnsetPrivateKeyException.php
new file mode 100644
index 0000000..c23efe6
--- /dev/null
+++ b/src/API/Exceptions/Keys/UnsetPrivateKeyException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions\Keys;
+
+use YouCan\Pay\API\Exceptions\ValidationException;
+
+class UnsetPrivateKeyException extends ValidationException
+{
+}
diff --git a/src/API/Exceptions/Keys/UnsetPublicKeyException.php b/src/API/Exceptions/Keys/UnsetPublicKeyException.php
new file mode 100644
index 0000000..213e16e
--- /dev/null
+++ b/src/API/Exceptions/Keys/UnsetPublicKeyException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions\Keys;
+
+use YouCan\Pay\API\Exceptions\ValidationException;
+
+class UnsetPublicKeyException extends ValidationException
+{
+}
diff --git a/src/API/Exceptions/ServerException.php b/src/API/Exceptions/ServerException.php
new file mode 100644
index 0000000..6e51c89
--- /dev/null
+++ b/src/API/Exceptions/ServerException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions;
+
+/**
+ * Exception when a server error is encountered (5xx codes)
+ */
+class ServerException extends BaseException
+{
+}
diff --git a/src/API/Exceptions/Token/MissingTokenException.php b/src/API/Exceptions/Token/MissingTokenException.php
new file mode 100644
index 0000000..918061f
--- /dev/null
+++ b/src/API/Exceptions/Token/MissingTokenException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions\Token;
+
+use YouCan\Pay\API\Exceptions\BaseException;
+
+class MissingTokenException extends BaseException
+{
+}
diff --git a/src/API/Exceptions/UnexpectedResultException.php b/src/API/Exceptions/UnexpectedResultException.php
new file mode 100644
index 0000000..9f1dfda
--- /dev/null
+++ b/src/API/Exceptions/UnexpectedResultException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions;
+
+class UnexpectedResultException extends BaseException
+{
+}
diff --git a/src/API/Exceptions/UnsupportedResponseException.php b/src/API/Exceptions/UnsupportedResponseException.php
new file mode 100644
index 0000000..ce50e7e
--- /dev/null
+++ b/src/API/Exceptions/UnsupportedResponseException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace YouCan\Pay\API\Exceptions;
+
+class UnsupportedResponseException extends BaseException
+{
+}
diff --git a/src/API/Exceptions/ValidationException.php b/src/API/Exceptions/ValidationException.php
index 1f49c5f..f84b981 100644
--- a/src/API/Exceptions/ValidationException.php
+++ b/src/API/Exceptions/ValidationException.php
@@ -2,12 +2,6 @@
 
 namespace YouCan\Pay\API\Exceptions;
 
-use Exception;
-
-class ValidationException extends Exception
+class ValidationException extends ClientException
 {
-    public function __construct(string $message)
-    {
-        parent::__construct($message);
-    }
 }
diff --git a/tests/API/Endpoints/TokenEndpointTest.php b/tests/API/Endpoints/TokenEndpointTest.php
index db0b3b6..d5803ac 100644
--- a/tests/API/Endpoints/TokenEndpointTest.php
+++ b/tests/API/Endpoints/TokenEndpointTest.php
@@ -5,8 +5,7 @@
 use Tests\API\FakeAPIService;
 use Tests\BaseTestCase;
 use YouCan\Pay\API\Endpoints\TokenEndpoint;
-use YouCan\Pay\API\Endpoints\TransactionEndpoint;
-use YouCan\Pay\API\Exceptions\InvalidResponseException;
+use YouCan\Pay\API\Exceptions\ServerException;
 use YouCan\Pay\API\Exceptions\ValidationException;
 use YouCan\Pay\API\Response;
 
@@ -87,7 +86,7 @@ public function test_validation_exception()
 
     public function test_internal_error()
     {
-        $this->expectException(InvalidResponseException::class);
+        $this->expectException(ServerException::class);
 
         $response = new Response(
             500,