Targeting video completion rate (VCR) in Inventory Packages (Alpha)

Buyers
Last Updated: February 12, 2026•

Video completion rate (VCR) is a measurement of the percentage of video impressions that played to completion. Index Exchange (Index) collects data across all our video supply to predict video completion rates.

How does it work?

Using publisher-provided placement identifiers like the Global Placement Identifier (GPID), Index tracks video completions at the most granular level possible. As we receive completion events, we use that data to predict the VCR for the inventory. The following formula is used to predict the VCR percentage:

VCR percentage = (number of completed views / measured impressions) * 100

For example, if the video ad is watched 200 times to completion, and 500 video impressions were measured, the VCR is 40%.

When available, we send the predicted VCR to DSPs in the imp.metric object of an OpenRTB bid request. In the following example, Index has measured the predicted VCR to be 99%:

{ 
	"id": "1928474302" 
	"imp": [ 
		{ 
			"id": "1", 
			"video": {"w": 1920, "h":1080, "maxduration": 60}, 
			"metric": [ 
				{ 
					"type": "video_completion_rate ", 
					"value": 0.99, 
					"vendor": "INDEXEXCHANGE" 
				} 
			], 
		} 
	] 
}

How to target a VCR percentage

Buyers can target a minimum VCR percentage in Inventory Packages. This means the predicted VCR of the supply must meet the minimum VCR percentage value targeted in the deal for the deal to be activated. For more information about how to create these deals, see Targeting options for Inventory Packages.