<?php
// app/Http/Controllers/Api/v1/ProfileController.php
namespace App\Http\Controllers\Api\v1;
use App\Models\Post;
use App\Models\User;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Http\Resources\ProfileResource;
class ProfileController extends Controller
{
    public function index(User $user)
    {
        return new ProfileResource($user);
    }
    public function create()
    {
        return response()->json(['message' => 'This is the create method.']);
    }
}
<?php
// routes/api.php
use Illuminate\Support\Facades\Route;
use App\Http\Controllers\Api\v1\ProfileController;
use App\Http\Controllers\Api\v1\PostController;
Route::prefix('v1')->group(function(){
    Route::get('profiles/{user}', [ProfileController::class, 'index'])->name('api.profiles.index');
    Route::get('profiles/create', [ProfileController::class, 'create'])->name('api.profiles.create');
});

درود آقای قاسمی 

دقت کنید توی Post man ادرس end point تون صحیح باشه 

موفق باشید