When is burl fired versus nurl?
Answer
nurl fires on auction win; burl fires later, when the win becomes billable under the exchange's business policy, which the spec describes as typically delivered or viewed. The two can be minutes apart or the burl may never fire at all if the ad loses downstream or fails to render, so bidders should reconcile spend against burl. For VAST video the spec's best practice is that the VAST impression event is the official billable signal, and an exchange adhering to that policy should fire burl at the same time as the VAST impression, while warning that firing both invites small discrepancies.
Go deeper
More questions on video, ctv, native, floors, deals, and macros
- How do I build an OpenRTB video bid request? Add an imp.video object to the impression; its presence is what marks the impression as video.
- What is plcmt in OpenRTB video? imp.video.plcmt declares the video placement subtype using AdCOM's Plcmt Subtypes list, which follows the updated IAB digital video guidelines.
- What plcmt value should I send for CTV inventory? Send imp.video.plcmt = 1 (instream) for CTV.
- Should I send placement or plcmt in a video bid request? Send both during the transition, but treat plcmt as authoritative.
- How does ad pod bidding work in OpenRTB 2.6? Each slot in the pod is its own imp, and a shared imp.video.podid ties them together.
- How do I signal server-side ad insertion (SSAI) in a bid request? Set imp.ssai, an integer added in OpenRTB 2.6 with default 0.
All 93 questions are listed in the OpenRTB FAQ.