plcmt 3 means Interstitial
A video ad with no content video that fills most of the screen and cannot be scrolled away.
When to send it
Send 3 for a video ad that plays on its own, with no content video around it, and covers most of the viewport while it plays so the user cannot scroll past it. Full-screen in-app video between screens or levels, and slideshow interstitials, are the usual cases.
Buyers price 3 on attention and completion rather than on content context. Mobile apps often also set Imp.instl to 1 for a full-screen unit, and rewarded video adds Imp.rwdd. It is confused with 4, which also has no content video but can be scrolled or sits in a feed, and with old Video.placement 5, which lumped interstitial, slider, and floating units together.
Example
{
"imp": [
{
"video": {
"plcmt": 3
}
}
]
}Fields that carry it
Other values in plcmt subtypes (video)
| Value | Name |
|---|---|
1 | Instream |
2 | Accompanying Content |
4 | No Content/Standalone |
5 | Pause |
6 | Screensaver |
7 | Overlay |
8 | Squeezeback |
9 | In-scene |
The plcmt subtypes (video) list page explains the whole list and its common mistakes.