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Last Updated: 11/25/2025
When ID5 provides an ID5 ID, we may also include certain metadata. Below you will find the different types of metadata we support and the values they could contain:
Link Type
A/B Testing Control Group
Link...
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Last Updated: 03/14/2025
in Retrieve ID5 IDs Introduction to Guarded Publisher ID (GPID) ID5 is offering partners a license to the Guarded Publisher ID, a publisher specific first-party cross-domain identifier. The GPID is a partner specific version of the ID5 ID which remains unique for...
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Last Updated: 02/09/2026
in Privacy
This endpoint was deprecated on 9th February 2026. Please use the Opt-Out API Overview The Mobile Opt-in and Opt-out API allows users to opt in and out of ID5 tracking via MAIDs. Opt Out Request Example URL https://api.id5-sync.com/priv...
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Last Updated: 10/24/2024
in Access Identity Graphs Overview ID5’s Matching File-Transfer protocol converts a file containing a list of your UIDs to a file containing the equivalent list of UIDs for one or more Match Partners. Available Match Partners are defined by contract between you and ID5. To...
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Last Updated: 03/04/2026
in Enrich
ID5’s real-time bid enrichment service for publishers is currently in alpha and available by invitation only .
What is ID5's Real-Time Bid Enrichment Service? ID5’s Real-Time Bid Enrichment is an optional, paid-for service that enables pu...
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Last Updated: 02/18/2026
in Retrieve ID5 IDs
Publisher Integration of the ID5 ID via Amazon Publisher Services Amazon's APS is the leading suite of cloud services that helps publishers build, monetize, and grow their digital media business. Read below for a step-by-step guide that takes yo...
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Last Updated: 04/01/2025
in Retrieve ID5 IDs
ID5 JS API Lite ID5 JS API Lite is a reduced-functionality version of the standard ID5 JS API. Unlike the full API, which facilitates a comprehensive set of identity-related functions, the Lite version is purposefully built to perform a single ...
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Last Updated: 12/04/2025
in Enrich
Overview Publishers and ad tech partners can choose to use the ID5 Graph to enrich their programmatic transactions with additional data. The Graph enables both probabilistic and deterministic connections between ID5 IDs and Platform Cookie IDs, w...
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Last Updated: 12/04/2024
in Retrieve ID5 IDs Prebid
Prebid troubleshooting: step-by-step guide To assist publishers in troubleshooting their Prebid integration, we have created this step-by-step guide, to help them review their integration. Step 1: Enable Prebid Debug Mode Make sure to use a new...
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Last Updated: 04/01/2025
ID5 is still expanding its support for campaign measurement and welcomes feedback.
ID5 enables event tracking and matching for campaign measurement and attribution. For instance, the ID5 ID, when paired with the ID5 graph, can be used ...