Amazon DSP

Overview

Amazon DSP (Demand-Side Platform) is Amazon's programmatic advertising system used to buy display, video, and audio ads across Amazon's own properties and thousands of third-party websites and apps. When its tracking pixels appear on a non-Amazon website, they are measuring ad campaign performance — tracking whether users who saw or clicked Amazon DSP ads completed conversions on the advertiser's site.

What This Script Does

Amazon DSP tracking loads pixels and scripts from s.amazon-adsystem.com, aax.amazon-adsystem.com, and z-na.amazon-adsystem.com (region-specific endpoints). These scripts fire on advertiser websites to perform three key functions:

1. Conversion tracking — Recording when users who were served Amazon DSP ads complete target actions (purchases, sign-ups, page views). The scripts match the user's browser identity to their earlier ad exposure using cookie-based and probabilistic identification.

2. Retargeting pixel collection — Building audience segments of website visitors for subsequent ad targeting through Amazon DSP. Visitors to specific pages (product pages, cart, checkout) are segmented into retargeting pools available in the DSP console.

3. Audience enrichment — Matching website visitor identifiers with Amazon's user graph to enrich audience segments with Amazon shopping behavior and demographic data.

Cookies set include:

• ad-id — Amazon advertising identifier cookie; 270-day expiry; used for cross-site user identification across the Amazon ad network
• ad-privacy — stores the user's ad privacy preferences within Amazon's ecosystem; 1,825-day expiry
• Third-party cookies under amazon-adsystem.com domain for cross-site tracking and frequency capping

The scripts also use pixel-based tracking (1x1 transparent images) that fire HTTP requests containing page URL, referrer, timestamp, and Amazon's advertising identifiers. These requests go to Amazon's ad measurement servers for campaign attribution reporting.

Amazon DSP operates within Amazon's broader advertising ecosystem, which includes one of the largest consumer purchase datasets in the world. The cross-site tracking enabled by DSP pixels allows advertisers to connect website behavior with Amazon purchase data for campaign optimization.

Consent & Compliance

Amazon DSP is classified as marketing. Its exclusive purpose is advertising — conversion tracking, retargeting audience building, and campaign attribution. It provides no functional benefit to the website visitor.

Under the GDPR, Amazon DSP tracking requires explicit consent. The scripts process personal data (advertising identifiers, browsing behavior, conversion events) for direct marketing purposes. Cross-site tracking via third-party cookies and audience matching with Amazon's user graph are clearly consent-requiring activities under Article 6(1)(a).

Under the ePrivacy Directive, the advertising cookies set by Amazon DSP are not strictly necessary for any user-requested service. Prior informed consent under Article 5(3) is required before these cookies may be placed. The long expiry times (270 days for ad-id) and cross-site nature underscore the consent requirement.

Under CCPA/CPRA, Amazon DSP tracking constitutes both sale and sharing of personal information for advertising purposes. Websites must provide opt-out mechanisms and honor GPC signals. Amazon's combination of website browsing data with its purchase data for ad targeting is a textbook case of cross-context behavioral advertising under CPRA.

Should You Block This Without Consent?

Yes. Amazon DSP tracking pixels exist solely for programmatic advertising — conversion measurement, retargeting, and audience enrichment. They set long-lived cross-site tracking cookies and feed data into Amazon's advertising ecosystem. These scripts must be blocked until the user explicitly consents to marketing tracking.