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Count on Begin to Render FAQ

All AppNexus tags use to "count on begin to render" as the standard for the counting of display impressions. You can find details on this standard on the IAB and MRC websites. This FAQ provides some basic details related to the standard. 

What is "count on begin to render"?

AppNexus proprietary tags apply the "count on begin to render" standard, meaning that a buyer’s ad must be delivered to the page or app and begin to render before a valid impression is counted. 

Which tags use this standard?

All AppNexus Proprietary Tags apply this standard, including, but not limited to:

  1. Proprietary AppNexus tags (/adx, /ptv, /ssmob, /ssptv, /ttv, /ut/v1, /ut/v2, /ut/v2/prebid, /ut/v3, /ut/v3/prebid, /vmap, /openrtb)
  2. Legacy banner display tags (/tt and /ttj)
  3. OpenRTB 2.3+ and Prebid (/asi, /jpt, /mtj)
  4. MSFT app supply (/map)
  5. AppNexus Mobile SDK and mobile tags
  6. AST
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