diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0b408d..6cc4a0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+3.1.0 (unreleased)
+=====
+
+* (deprecation) Deprecate passing a `bool` to the constructor of `ApiResponse`.
+* (feature) Enforce passing an explicit status code to the constructor of `ApiReponse`.
+
 3.0.2
 =====
 
diff --git a/UPGRADE.md b/UPGRADE.md
index c2fdec7..2e3c6fa 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,3 +1,10 @@
+3.x to 4.0
+==========
+
+* Passing a `bool` to the constructor of `ApiResponse` was removed, pass a status code instead.
+* The method `ApiResponse::withStatusCode()` was removed. Pass the status code in the constructor instead.
+
+
 2.x to 3.0
 ==========
 
diff --git a/src/Api/ApiResponse.php b/src/Api/ApiResponse.php
index 5815ee8..646f4c5 100644
--- a/src/Api/ApiResponse.php
+++ b/src/Api/ApiResponse.php
@@ -10,11 +10,20 @@ class ApiResponse
 	/**
 	 */
 	public function __construct (
-		public readonly bool $ok,
+		bool|int $statusCode,
 		public readonly mixed $data = null,
 	)
 	{
-		$this->statusCode = $ok ? 200 : 400;
+		// @todo remove check in v4, make parameter int only and readonly.
+		if (\is_int($statusCode))
+		{
+			$this->statusCode = $statusCode;
+		}
+		else
+		{
+			\trigger_deprecation("21torr/rad", "3.1.0", "Passing a bool as first value to ApiResponse is deprecated. Pass the status code instead.");
+			$this->statusCode = $statusCode ? 200 : 400;
+		}
 	}
 
 
@@ -23,6 +32,13 @@ public function __construct (
 	 */
 	public function withStatusCode (int $statusCode) : self
 	{
+		// @todo remove method in v4
+		\trigger_deprecation(
+			"21torr/rad",
+			"3.1.0",
+			"Calling ApiResponse::withStatusCode() is deprecated, pass the status code in the constructor instead.",
+		);
+
 		$this->statusCode = $statusCode;
 		return $this;
 	}
@@ -36,4 +52,13 @@ public function withError (?string $error) : self
 		$this->error = $error;
 		return $this;
 	}
+
+
+	/**
+	 *
+	 */
+	public function isOk () : bool
+	{
+		return $this->statusCode >= 200 && $this->statusCode <= 299;
+	}
 }
diff --git a/src/Api/ApiResponseNormalizer.php b/src/Api/ApiResponseNormalizer.php
index d8cc3a2..2468597 100644
--- a/src/Api/ApiResponseNormalizer.php
+++ b/src/Api/ApiResponseNormalizer.php
@@ -11,7 +11,7 @@ public function normalize (ApiResponse $apiResponse) : array
 	{
 		return \array_filter(
 			[
-				"ok" => $apiResponse->ok,
+				"ok" => $apiResponse->isOk(),
 				"data" => $apiResponse->data,
 				"error" => $apiResponse->error,
 			],
diff --git a/tests/Api/ApiResponseNormalizerTest.php b/tests/Api/ApiResponseNormalizerTest.php
index 057bb97..8b668f7 100644
--- a/tests/Api/ApiResponseNormalizerTest.php
+++ b/tests/Api/ApiResponseNormalizerTest.php
@@ -13,7 +13,7 @@ class ApiResponseNormalizerTest extends TestCase
 	 */
 	public function testMinimal () : void
 	{
-		$apiResponse = new ApiResponse(false);
+		$apiResponse = new ApiResponse(400);
 		$normalizer = new ApiResponseNormalizer();
 
 		self::assertEquals([
@@ -27,7 +27,7 @@ public function testMinimal () : void
 	public function testMaximal () : void
 	{
 		$apiResponse = (new ApiResponse(
-			true,
+			200,
 			["o" => "hai"],
 		))
 			->withError("error message");
diff --git a/tests/Api/ApiResponseTest.php b/tests/Api/ApiResponseTest.php
new file mode 100644
index 0000000..d1c07a4
--- /dev/null
+++ b/tests/Api/ApiResponseTest.php
@@ -0,0 +1,51 @@
+<?php declare(strict_types=1);
+
+namespace Tests\Torr\Rad\Api;
+
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
+use Torr\Rad\Api\ApiResponse;
+use PHPUnit\Framework\TestCase;
+
+class ApiResponseTest extends TestCase
+{
+	use ExpectDeprecationTrait;
+
+	/**
+	 *
+	 */
+	public function testOk () : void
+	{
+		self::assertTrue((new ApiResponse(202))->isOk());
+		self::assertFalse((new ApiResponse(418))->isOk());
+	}
+
+
+	/**
+	 * @group legacy
+	 */
+	public function testLegacyBoolConstructorTrue () : void
+	{
+		$this->expectDeprecation("Since 21torr/rad 3.1.0: Passing a bool as first value to ApiResponse is deprecated. Pass the status code instead.");
+		new ApiResponse(true);
+	}
+
+	/**
+	 * @group legacy
+	 */
+	public function testLegacyBoolConstructorFalse () : void
+	{
+		$this->expectDeprecation("Since 21torr/rad 3.1.0: Passing a bool as first value to ApiResponse is deprecated. Pass the status code instead.");
+		new ApiResponse(false);
+	}
+
+	/**
+	 * @group legacy
+	 */
+	public function testLegacyResettingStatusCode () : void
+	{
+		$this->expectDeprecation("Since 21torr/rad 3.1.0: Calling ApiResponse::withStatusCode() is deprecated, pass the status code in the constructor instead.");
+
+		(new ApiResponse(201))
+			->withStatusCode(418);
+	}
+}
diff --git a/tests/Listener/ControllerResponseListenerTest.php b/tests/Listener/ControllerResponseListenerTest.php
index dbc6167..cbf9147 100644
--- a/tests/Listener/ControllerResponseListenerTest.php
+++ b/tests/Listener/ControllerResponseListenerTest.php
@@ -19,7 +19,7 @@ class ControllerResponseListenerTest extends TestCase
 	 */
 	public function testIntegration () : void
 	{
-		$event = $this->createEvent(new ApiResponse(true));
+		$event = $this->createEvent(new ApiResponse(200));
 
 		$listener = new ControllerResponseListener(new ApiResponseNormalizer());
 		$listener->onView($event);
@@ -46,9 +46,9 @@ public function testIntegrationWithOtherResult () : void
 	 */
 	public function provideStatusCode () : iterable
 	{
-		yield [200, new ApiResponse(true)];
-		yield [400, new ApiResponse(false)];
-		yield [418, (new ApiResponse(false))->withStatusCode(418)];
+		yield [200, new ApiResponse(200)];
+		yield [400, new ApiResponse(400)];
+		yield [418, new ApiResponse(418)];
 	}
 
 	/**