ECAPI, which stands for Event and Conversion API, is an open industry standard from IAB Tech Lab, developed to give advertisers a unified way to share marketing event data with ad platforms and partners through server-to-server connections.
The Story Behind
CAPI as a concept has been part of digital advertising for a while. The problem, however, was that Google, Meta, TikTok, and other major platforms each came with their proprietary data formats, event naming conventions, and connection requirements. As a result, advertisers running campaigns across multiple platforms had to build and support a separate setup for every single partner, and cross-channel attribution measurement still wasn’t effective enough.
Aiming to bridge a measurement gap, IAB Tech Lab has introduced ECAPI: one shared tech specification that any advertiser can use to communicate marketing events to any compliant platform or partner. From a tech side, it works like a server-to-server protocol and covers the entire customer journey, from the first ad impression through clicks, registrations, and conversions.
Benefits of ECAPI
For advertisers, the first thing that stands out about ECAPI is easier integration. Instead of setting up a separate connection for every ad platform they work with, they need to implement the standard once and roll it out across all compliant partners, cutting down development time and operational effort.
A shared event data format is what makes consistent measurement actually possible across the ecosystem. Ad platforms get cleaner, more predictable data to work with, which in turn leads to more accurate reporting and better campaign ROI, making it especially relevant amid the digital ad measurement challenges the industry has been dealing with for years.
The adoption of ECAPI is especially relevant for connected TV ad space, where granular measurement and attribution have always been tricky.
Perspectives of Adoption
IAB Tech Lab closed the public comment period for ECAPI specification in February 2026, and version 1.0 is now available for implementation. For advertisers already processing conversion events server-side, implementing ECAPI doesn’t mean rebuilding everything from scratch. In most cases, it is really just a matter of mapping existing events to the new standard event types and adjusting the data format to match the spec.
From platforms’ and publishers’ perspective, the standard is flexible enough to adapt to their existing tech specs, offering a shared framework that makes onboarding new partners faster and smoother. Going by typical adoption cycles, major platforms are likely to add ECAPI support in the second half of 2026, with the rest of the industry catching up through 2027.