Stripe blocked frame origin

I have custom stripe form so I am using standard javascript file:

<script type="text/javascript" src="https://js.stripe.com/v2/"></script>

I try to get the token with:

<script>
  Stripe.setPublishableKey('xxx'); 
  Stripe.card.createToken({
      number: '4242 4242 4242 4242',
      cvc: '100',
      exp: '10/2018'
    },
    function (response) {
      console.log(response);
    }
  );
</script>

Code is pretty straight forward but I receive exception in my browser:

(index):3 Uncaught SecurityError: 
Blocked a frame with origin "https://localhost:3000" 
from accessing a frame with origin "https://js.stripe.com". 
Protocols, domains, and ports must match.

Any idea what am I doing wrong?