POST calls return 404 In Laravel

I am creating signup api 1st is GET call and 2nd is POST call. When I make GET[POSTMAN] call i get proper response from the controller but when I make POST it returns 404.

#web.php
// sign up api

Route::get('signup','Api\RegistrationController@createUser');Route::post('/signup','Api\RegistrationController@storeUser');

RegistrationController.php

public function createUser(){
 return "Get : Sign up";
}
public function storeUser() {
// validate the form

$this->validate(request(),[
  'firstname' => 'required',
  'lastname' => 'required',
  'email' => 'required',
  'password' => 'required'
]);

 // create and save the user

  $user = Register::create(request(['firstname', 'lastename', 
  'email', 'password']));

  return "Registration complete";
}

I am using laravel 5.4.

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