diff --git a/src/Attributes/FromMapper.php b/src/Attributes/CastWith.php
similarity index 93%
rename from src/Attributes/FromMapper.php
rename to src/Attributes/CastWith.php
index ffdce99..6d544c5 100644
--- a/src/Attributes/FromMapper.php
+++ b/src/Attributes/CastWith.php
@@ -7,7 +7,7 @@ namespace Icefox\DTO\Attributes;
 use Attribute;
 
 #[Attribute(Attribute::TARGET_PARAMETER)]
-class FromMapper
+class CastWith
 {
     /**
      * @param class-string $class
diff --git a/src/Config.php b/src/Config.php
new file mode 100644
index 0000000..a25d8df
--- /dev/null
+++ b/src/Config.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Icefox\DTO;
+
+class Config
+{
+    public static function getCaster(string $className): ?callable
+    {
+        return config('dto.cast.' . $className, null);
+    }
+
+    public static function getRules(string $className): ?callable
+    {
+        return config('dto.rules.' . $className, null);
+    }
+}
diff --git a/src/DataObject.php b/src/DataObject.php
index 9807b35..c6b05d8 100644
--- a/src/DataObject.php
+++ b/src/DataObject.php
@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace Icefox\DTO;
 
 use Icefox\DTO\Attributes\FromInput;
-use Icefox\DTO\Attributes\FromMapper;
+use Icefox\DTO\Attributes\CastWith;
 use Icefox\DTO\Attributes\FromRouteParameter;
 use Icefox\DTO\Support\RuleFactory;
 use Icefox\DTO\Support\ValueFactory;
@@ -78,7 +78,7 @@ trait DataObject
         foreach ($parameters as $parameter) {
             $parameterName = $parameter->reflection->getName();
 
-            if ($mapper = array_first($parameter->reflection->getAttributes(FromMapper::class))) {
+            if ($mapper = array_first($parameter->reflection->getAttributes(CastWith::class))) {
                 $value = App::call(
                     [App::make($mapper->newInstance()->class), 'map'],
                     ['value' => $validator->getValue($parameterName)],
diff --git a/src/Support/RuleFactory.php b/src/Support/RuleFactory.php
index 623ebc9..a3572b6 100644
--- a/src/Support/RuleFactory.php
+++ b/src/Support/RuleFactory.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Icefox\DTO\Support;
 
+use Icefox\DTO\Attributes\CastWith;
+use Icefox\DTO\Config;
 use Icefox\DTO\Attributes\FromMapper;
 use Icefox\DTO\ParameterMeta;
 use Illuminate\Support\Facades\App;
@@ -139,7 +141,7 @@ class RuleFactory
         }
 
         if ($type instanceof ReflectionNamedType && $name = $type->getName()) {
-            if ($globalRules = config('dto.rules.' . $name)) {
+            if ($globalRules = Config::getRules($name)) {
                 foreach ($globalRules($parameter->reflection, $parameter->tag->getType()) as $scopedPrefix => $values) {
                     $realPrefix = $root . $scopedPrefix;
                     $rules[$realPrefix] = array_values(array_unique(array_merge($rules[$realPrefix] ?? [], $values)));
@@ -166,7 +168,7 @@ class RuleFactory
             }
         }
 
-        foreach ($parameter->reflection->getAttributes(FromMapper::class) as $attr) {
+        foreach ($parameter->reflection->getAttributes(CastWith::class) as $attr) {
             $mapperClass = $attr->newInstance()->class;
             if (method_exists($mapperClass, 'rules')) {
                 $subRules = App::call("$mapperClass@rules");
diff --git a/src/Support/ValueFactory.php b/src/Support/ValueFactory.php
index efebe48..992402e 100644
--- a/src/Support/ValueFactory.php
+++ b/src/Support/ValueFactory.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Icefox\DTO\Support;
 
+use Icefox\DTO\Attributes\CastWith;
+use Icefox\DTO\Config;
 use Illuminate\Support\Facades\App;
 use ReflectionNamedType;
 use ReflectionParameter;
@@ -20,7 +22,7 @@ class ValueFactory
 {
     public static function constructObject(string $className, mixed $rawValue): object
     {
-        if ($mapper = config('dto.mappers.' . $className, null)) {
+        if ($mapper = Config::getCaster($className)) {
             return $mapper($rawValue);
         }
 
@@ -83,21 +85,32 @@ class ValueFactory
             return null;
         }
 
-        if (is_null($type)) {
-            $reflectedType = $reflection->getType();
-            if ($reflectedType instanceof ReflectionNamedType && $name = $reflectedType->getName()) {
-                return match ($name) {
-                    'string' => $rawValue,
-                    'bool' => boolval($rawValue),
-                    'int' => intval($rawValue),
-                    'float' => floatval($rawValue),
-                    'array' => $rawValue,
-                    default => self::constructObject($name, $rawValue),
-                };
-            }
-            return $rawValue;
+        $castWithAttrs = $reflection->getAttributes(CastWith::class);
+        if ($withCast = $reflection->getAttributes(CastWith::class)[0] ?? null) {
+            $caster = $withCast->newInstance()->class;
+            return App::call("$caster@cast", ['value' => $rawValue]);
         }
 
-        return self::resolveTypedValue($rawValue, $type);
+        if (!is_null($type)) {
+            return self::resolveTypedValue($rawValue, $type);
+        }
+
+        $reflectedType = $reflection->getType();
+        if ($reflectedType instanceof ReflectionNamedType && $name = $reflectedType->getName()) {
+            if ($caster = Config::getCaster($name)) {
+                return App::call($caster, ['value' => $rawValue]);
+            }
+
+            return match ($name) {
+                'string' => $rawValue,
+                'bool' => boolval($rawValue),
+                'int' => intval($rawValue),
+                'float' => floatval($rawValue),
+                'array' => $rawValue,
+                default => self::constructObject($name, $rawValue),
+            };
+        }
+
+        return $rawValue;
     }
 }
diff --git a/src/config/dto.php b/src/config/dto.php
index 634b846..201d3eb 100644
--- a/src/config/dto.php
+++ b/src/config/dto.php
@@ -4,11 +4,8 @@ use Icefox\DTO\Factories\CollectionFactory;
 use Illuminate\Support\Collection;
 
 return [
+    'cast' => [],
     'rules' => [
         Collection::class => CollectionFactory::rules(...),
     ],
-    'default' => [
-        'factories' => [
-        ],
-    ],
 ];
diff --git a/tests/Classes/WithMapperObject.php b/tests/Classes/WithMapperObject.php
index 31e0bd3..899b8fe 100644
--- a/tests/Classes/WithMapperObject.php
+++ b/tests/Classes/WithMapperObject.php
@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace Tests\Classes;
 
 use Carbon\CarbonPeriodImmutable;
-use Icefox\DTO\Attributes\FromMapper;
+use Icefox\DTO\Attributes\CastWith;
 use Icefox\DTO\DataObject;
 
 readonly class WithMapperObject
@@ -13,7 +13,7 @@ readonly class WithMapperObject
     use DataObject;
 
     public function __construct(
-        #[FromMapper(CarbonPeriodMapper::class)]
+        #[CastWith(CarbonPeriodMapper::class)]
         public CarbonPeriodImmutable $period,
     ) {}
 }