Publishers offering "Welcome Ad" spots

A welcome ad appears for a few seconds when someone arrives, before the page loads, often with a skip button. Swiss sites like 20min and Blick run them, and Dagens industri sells one too.

How it's sold: Booked with the publisher's sales team, usually limited to one advertiser per day. Seven of the eight publishers sell it on the web and one in an app.
Typical price: A flat fee per day or per 1,000 impressions is the usual basis, quoted on request.
What you supply: A full-page image or short video and a landing link, in the sizes the publisher lists for desktop and mobile.
Best for: Launches and campaigns that need one clear message in front of every visitor.
Before you buy: Some publishers show it only once per session, so ask how often a returning visitor sees it.