When you say pageviews- what exactly do you mean?
If you're using JavaScript on your site, we charge you based on the number of people that view any page where the ethnio code is implemented. There are other measurements of traffic like unique visitors, but page views is pretty close to "every time someone loads your page." That means if they refresh the page, that's another view. This is the closest approximation to how much it hits our server, which happens every time the page loads.
Otherwise, if you're not implementing any code, we charge based on the number of views/responses that you receive. You might now be asking yourself, why on earth do I have to pay for traffic to ethnio even when a screener is turned off? Click here to read more on that.