IAB Tech Lab Seeks Industry Input on ECAPI Data Clean Room Guidelines

The IAB Tech Lab has released its "ECAPI Guidelines for Data Clean Rooms," opening the framework for industry-wide comment. The initiative establishes a standardized method for advertisers to package and upload conversion event data into data clean rooms, ensuring consistency across the advertising ecosystem.

Published by Jill Wittkopp, VP Product at the IAB Tech Lab, via the ECAPI Working Group, the draft outlines rigorous technical requirements for data handling. These specifications mandate specific encryption standards, Parquet layout, partitioning, and file metadata to ensure conversion events are processed uniformly across different platforms. Industry stakeholders have until September 4, 2026, to submit feedback on the proposed rules.

The Shift Toward Standardized Privacy

Data clean rooms provide secure environments where multiple parties combine and analyze datasets without exposing raw personally identifiable information (PII). This architecture has become critical as the advertising industry pivots away from third-party cookies toward privacy-centric, first-party data solutions.

The current guidelines build upon the core ECAPI (Enhanced Conversions API) standard released in April 2026. While the initial standard focused on the server-to-server transmission of conversion data, these new guidelines extend that logic to the specific requirements of clean room environments. The goal is to unify the attributes and definitions used to measure conversions across the entire ecosystem.

Reducing Technical Friction

Standardizing data packaging for clean rooms is intended to reduce technical overhead for both advertisers and clean room operators. By creating a common language for data uploads, the IAB Tech Lab aims to eliminate the need for custom integrations for every individual partner, thereby ensuring greater interoperability and consistency in measurement.

Without such standards, fragmented data formats often lead to measurement discrepancies and increased engineering costs. A unified framework allows for a more seamless flow of first-party data, enabling brands to maintain measurement accuracy while adhering to strict privacy constraints.

Next Steps for the Industry

The IAB Tech Lab is now awaiting feedback from the broader advertising community to refine the specifications before finalization. The primary focus for observers will be whether the industry adopts these Parquet and encryption standards broadly enough to make them the default for clean room operations. Until the September 4 deadline passes, the guidelines remain in draft form as the ECAPI Working Group evaluates the feasibility of the proposed technical requirements.