Observed Signal · Jun 25, 2026 · Technical Release · Source: Adzine · Impact: 4/5 · Sentiment: Positive
Supply Path Optimization / Programmatic Infrastructure Market: IAB Tech Lab Proposes SupplyChain v1.1 for schain
The IAB Tech Lab has proposed Supplychain v1.1, an extension to the OpenRTB Supplychain (schain) object, to make technical hops in programmatic bid requests more visible. The draft adds a new version marker and a flag (hp=0) to indicate actors that take technical responsibility for a bid request without participating in the payment flow (examples: Prebid, ad servers, SSAI platforms, SDKs, wrappers). The proposal is in public comment until 21 August 2026. The change aims to shift supply-path-optimization (SPO) away from simplistic node-counting toward transparency, accountability and bid-quality analysis, but adoption depends on coordinated implementation and consistent, machine-readable data across SSPs, DSPs, publishers and ad infrastructure vendors.
A standards update from IAB Tech Lab changes how supply paths are represented in OpenRTB, affecting SPO, transparency and implementations across SSPs, DSPs, ad servers and header-bidding tooling — adoption will materially affect programmatic trading and inventory assessment.
Key Takeaways & Evidence Grounding
- IAB Tech Lab proposed Supplychain v1.1 as an extension to the OpenRTB Supplychain (schain) object.
- The public commenting period for the proposal is open until 21 August 2026.
- Supplychain v1.1 introduces a version marker and recommends using the flag "hp=0" to mark technical participants that are not part of the payment flow.
- The change is intended to expose technical hops (e.g., Prebid, ad servers, SSAI platforms, SDKs, wrappers) involved in creating and routing bid requests.
- The proposal aims to move SPO evaluation from pure node-counting toward transparency, responsibility and bid-quality assessment; implementation requires coordination among SSPs, DSPs, publishers and infrastructure providers.
Connected Companies & Entities
3 Entities mappedSEMrush
B2B marketing intelligence software for SEO, ads, and competitive research.
Prebid
Open-source header bidding standards body for publishers and ad tech.
“The article lists Prebid as an example of a technical actor that should become visible under the new model—i.e., entities that take technica...”
MediaPost
B2B media publisher and events company for marketing professionals.
“The US trade medium Mediapost characterises the proposal as a potential move away from simple 'node counting' toward SPO focused on transpar...”
Ontology Mapping & Concepts
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