The opaque nature of programmatic advertising, long a source of frustration for advertisers and publishers alike, is facing a significant challenge with the introduction of new transparency standards by the Media Rating Council (MRC). The MRC, a non-profit organization focused on improving the measurement of media, has unveiled a comprehensive set of guidelines aimed at shedding light on the complex inner workings of digital ad auctions, alongside a voluntary certification program for platforms that adhere to these new principles. This initiative seeks to foster greater trust and accountability within the digital advertising ecosystem by demanding clearer disclosures about how ad impressions are bought and sold.
The core of the problem, as articulated by industry stakeholders, lies in the proprietary algorithms and distinct operational rules employed by various ad platforms. This inherent lack of standardization means that advertisers and publishers often operate with incomplete knowledge of the factors influencing auction outcomes, leading to potential inefficiencies, distrust, and a degradation of the advertiser-agency relationship. The MRC’s endeavor is not to impose a single, monolithic auction system but rather to establish a universal framework for explanation and disclosure.
Illuminating the "Black Boxes" of Programmatic Auctions
For years, the programmatic advertising landscape has been characterized by a pervasive opacity. The intricate dance of bids, algorithms, and data points that determine which ad ultimately appears before a user has often felt like a black box, with little insight into the underlying mechanics. This lack of transparency has fueled skepticism and made it challenging for buyers and sellers to optimize their strategies or fully understand the value they are receiving or providing.
"Programmatic has become almost synonymous with opacity," stated Ron Pinelli, the MRC’s SVP of Digital Research and Standards. He elaborated that the goal of these new standards is not to dictate a uniform auction process but to create a consistent language and structure for explaining how these auctions function. "The purpose isn’t to force every platform to use the same auction playbook or a single algorithm," Pinelli explained to AdExchanger. "Instead, the standards create a consistent framework for explaining how auctions work and push platforms to disclose their ‘key decision variables’ for determining results, as well as any changes to their auction rules."
The new standards require platforms seeking MRC certification to disclose a detailed list of auction parameters. This includes whether they operate on a first-price, second-price, or modified second-price auction model. Crucially, platforms must also reveal whether factors beyond the raw bid price—such as the priority of the demand source or seller-defined rules—play a role in determining which bid ultimately wins the impression.
Furthermore, the standards address publisher-side controls, mandating that publishers and Supply-Side Platforms (SSPs) disclose their use of reserve prices or floor pricing. A critical component of this requirement is the stipulation that these floors must be applied uniformly to all buyers, preventing discriminatory pricing practices that could disadvantage certain advertisers.
The Genesis of Transparency: A Collaborative Industry Effort
The impetus for these new standards originated from a collaborative effort, spearheaded by Omnicom Media Group (OMG) in conjunction with the MRC. The initiative began to take shape in early 2024, with the formation of a dedicated steering team. This team garnered substantial support, drawing participation from nearly 70 companies and organizations across the digital advertising spectrum. The roster of involved entities reads like a who’s who of the industry, including major platforms like Meta, TikTok, and X; leading publishers such as Hearst; prominent ad agencies; and influential ad tech vendors like The Trade Desk. Key industry trade organizations, including the 4A’s, ANA, WFA, and the IAB Tech Lab, also lent their expertise and support to the project.
Ben Hovaness, Chief Media Officer of Omnicom-owned OMD Worldwide, has been a driving force behind this initiative. His deep engagement with the intricacies of programmatic ad auction theory led him to observe a significant gap in industry standards for disclosing auction mechanics. Hovaness has been actively educating internal teams on ad auctions since 2014 and has meticulously collected official auction rule disclosures from major players like Google, Meta, and Amazon for Omnicom’s Council on Accountability and Standards in Advertising. In 2023, he formally brought this project to the MRC with the explicit aim of establishing the industry’s first definitive standard for auction rules and disclosure of changes.
Hovaness articulated the fundamental inequity he perceived: "It always seemed unreasonable to ask advertisers or agencies to place a bid in an auction where the rules are unknown." He further argued that such opacity not only erodes trust between advertisers and sellers but also "degrades the advertiser-agency relationship." He drew a stark contrast with traditional auction environments, stating, "If you go to Sotheby’s or Christie’s, you get a term sheet at the door that says exactly how the auction works, how much the auction house is taking—all the associated fees and rules. That is how you run a good auction with high integrity."
The Pillars of Transparency: Key Disclosure Requirements
To achieve MRC certification, platforms must meet a rigorous set of disclosure requirements. These are designed to provide a baseline level of understanding and fairness for all participants in the digital ad auction process. Beyond the aforementioned auction type and pricing floor disclosures, platforms are expected to be transparent about:
- Auction Mechanics: Clearly define whether the auction is first-price, second-price, or a variation thereof, and how factors beyond bid price influence the winning bid.
- Deal and Private Marketplace (PMP) Rules: Disclose any specific rules or conditions that govern deals and PMPs, which are often used for direct transactions between buyers and sellers.
- Data Usage and Eligibility: Provide information on how data is used within the auction process and any criteria that determine bid eligibility.
- Fees and Deductions: Clearly outline all fees and deductions taken at various stages of the transaction, from the SSP to the DSP.
- Changes to Auction Rules: Implement a process for notifying participants of any changes to auction rules and the rationale behind them.
The MRC standards also incorporate a requirement for platforms to adopt certain industry best practices, some of which have been met with resistance or slow adoption. This includes embracing controversial OpenRTB specifications and other standards that the industry has been hesitant to fully embrace.
Driving Adoption of Industry Standards: OpenRTB and Beyond
A significant aspect of the MRC’s transparency standards is their role in encouraging the adoption of updated industry protocols, particularly those promoted by the IAB Tech Lab. Some of these specifications have been slow to gain traction, while others have sparked considerable debate.
One such area is the standardization of video ad labeling. The MRC now mandates that platforms must exclusively use the new video.plcmt field for labeling and decisioning online video ads. The IAB Tech Lab introduced video.plcmt to the OpenRTB specification in 2023 with the aim of establishing a clearer distinction between "instream" and "outstream" video ad placements. However, many Demand-Side Platforms (DSPs) and SSPs have continued to rely on the older, now-deprecated video.placement spec, or even utilize both. The MRC’s mandate seeks to finally align the industry on the new, more precise standard.
Another crucial element addressed by the MRC standards is the universal adoption of Transaction IDs (TIDs), in alignment with the IAB Tech Lab’s OpenRTB specification. TIDs are critical for accurately tracking and attributing ad delivery across different platforms and preventing duplicate counting of ad impressions. The implementation of TIDs was the subject of a public dispute last year between Prebid.org and The Trade Desk, highlighting the complexities and differing priorities within the ecosystem. While Prebid initially disabled TIDs by default in an update, it later relented, allowing publishers to revert to universal TIDs but still keeping them disabled by default. Notably, Prebid.org is absent from the list of contributors to the MRC’s new transparency standards, and the organization declined to comment on its nonparticipation.
Pinelli, however, assured that the MRC is not solely prioritizing buy-side concerns. The new standards also require DSPs to submit multiple bids per auction. This provision aims to provide publishers with greater insight into the competitive bidding landscape without resorting to practices that duplicate bid requests or obscure TIDs to facilitate bid duplication. This multi-bidding provision also serves as a compromise for requiring publishers and SSPs to include a Global Placement ID (GPID)—a unique identifier for each ad placement—in every bid request.
Challenges and the Path Forward: Gaining Industry Buy-In
Despite the MRC’s efforts to foster broad industry involvement, some significant players remain absent from the list of official contributors. Notably, Google and Amazon, both dominant forces in ad buying and selling, did not participate directly in the development of these standards. These companies, which often face scrutiny regarding their auction transparency, did not provide comments by the publication deadline.
"The MRC can’t compel any organization to [participate]," Pinelli acknowledged. "Many organizations did not participate directly, but commented during the public comment period." He emphasized that participation in the transparency certification program is entirely voluntary, with platforms subject to annual reevaluation for compliance. This accreditation process is distinct from other MRC accreditations.
The MRC’s transparency steering team is already looking ahead, with plans to develop solutions for mid- and long-tail publishers who may lack the resources to pursue the full MRC accreditation process. Additionally, the group is working on new standards for incrementality measurement, another area ripe for greater clarity and standardization.
Encouraging widespread adoption of these new standards, a perennial challenge in the fragmented digital advertising industry, will likely depend on the collective voice of advertisers. Hovaness urged advertisers, particularly larger brands, to leverage their relationships with major sell-side platforms. "If there’s enough advertiser interest," he stated, "then this is going to move ahead." The success of this initiative hinges on the willingness of platforms to embrace greater transparency and the sustained demand from advertisers for a more understandable and accountable programmatic ecosystem. The introduction of these standards marks a pivotal moment, offering a potential turning point in the long-standing battle for clarity in digital ad auctions.
