IAB Tech Lab Revises OpenRTB for Live Content Clarity

IAB Tech Lab has introduced updates to OpenRTB that tackle a growing challenge in programmatic advertising: bringing clarity to what “live” content actually means within the bidstream. The standards organization is rolling out new attributes to describe live content, alongside a revision to substitution macros that improves how pricing and discounts flow between buyers and sellers. Both updates are now open for public comment until late May.

At its core, this initiative aims to reduce ambiguity in the supply chain. As more live and near-live content enters programmatic channels, the distinctions between a genuine live event, a real-time stream, and a first broadcast window become increasingly critical for how inventory is valued and purchased. Without standardized signals, buyers have struggled to interpret these nuances programmatically.

The update introduces two optional fields and clarifies an existing one in both OpenRTB and AdCOM. These additions allow sellers to describe the “liveness” of content in a more structured way within the bid request. This means buyers can now differentiate between content happening at the exact moment of the bid, content streaming in real time but not strictly live, and content in its first scheduled broadcast window.

These distinctions directly affect how buyers prioritize spend. A live sports moment carries a vastly different urgency and value compared to a same-day stream or a scheduled premiere. The lack of standardized signals has made it harder to interpret programmatically, and these new fields are designed to remove that ambiguity.

Beyond content clarity, IAB Tech Lab is also refining substitution macros in OpenRTB to clean up pricing signals. The changes focus on how price-related data flows through the bidstream, specifically making it easier to pass back information about discounts and net pricing to demand-side platforms. That gives buyers a clearer view of what they are actually paying and how pricing adjustments are applied.

Combined, these updates aim to reduce friction on both sides of the transaction. Buyers gain better context and pricing clarity, while sellers can more accurately represent premium inventory. This work arrives as programmatic environments grow more complex, particularly with the surge in CTV and live-event inventory. Initiatives like the Live Event Ad Playbook have already highlighted the need for stronger standards in this area.

As more live sports, premieres, and streaming events become available programmatically, timing becomes a key pricing variable. Inventory that is truly live tends to carry a higher value, but only if buyers can recognize it as such. The updates come from IAB Tech Lab’s Programmatic Supply Chain working group, and the organization is seeking industry feedback before finalizing the specs. The public comment period runs through May 28.