Placement positions value 3 means Below The Fold

When to send it

Use 3 when the slot loads below the first screen. Lazy-loaded slots that request only as they approach the viewport are a gray area, because by the time the request fires the slot may be nearly in view, and some sellers report 1 for them. Whichever you choose, keep it consistent with what measurement shows. The value goes in Banner.pos or Video.pos.

Buyers expect lower viewability from 3 and may bid less or exclude it from campaigns with viewability goals, which tempts sellers to send 0 instead. Resist that: an accurate 3 builds more trust than an unexplained 0. It is also confused with 6 (Sidebar), a layout value that can sit above or below the fold.

Example

{
  "imp": [
    {
      "banner": {
        "pos": 3
      }
    }
  ]
}

Fields that carry it

• imp.banner.pos
• imp.video.pos

Other values in placement positions

The placement positions list page explains the whole list and its common mistakes.