SeenThis, a video‑ad technology provider that specializes in streaming‑based ad delivery, announced on February 20, 2026 that it has completed a server‑to‑server (S2S) integration with Amazon Ads. The new connection enables advertisers to target Amazon Custom Audiences with SeenThis’ video formats across the broader open web, rather than being confined to Amazon’s own properties.
The integration follows Amazon’s standard S2S delivery model for all campaigns running on its ad platform. By adopting this method, SeenThis can pass audience identifiers directly to Amazon’s servers, activate the custom audience segment, and receive the corresponding ad inventory in real time. The move is positioned as a bridge between Amazon’s rich first‑party data and the expansive inventory of premium publishers that populate the open web.
Why the development matters
For many brands, Amazon represents a gold mine of shopper intent data, yet the platform’s ad inventory is limited to its own ecosystem. Advertisers who wish to leverage that data across other sites have historically relied on third‑party data providers or pixel‑based solutions that can be less precise and more vulnerable to privacy restrictions. An S2S link eliminates the need for client‑side cookies, reduces latency, and aligns with the industry’s shift toward server‑based data exchanges.
“While social platforms offer scale, the open web holds massive untapped advertising potential,” said Jesper Benon, CEO of SeenThis. “This integration allows brands to connect Amazon Custom Audiences with premium publishers and open‑web environments, using SeenThis’ technology to deliver video advertising that captures attention, performs across the funnel, and respects how audiences consume content.”
Benon’s comment underscores a broader trend: advertisers are increasingly seeking ways to combine high‑intent audience signals with the reach and diversity of programmatic buys. By marrying Amazon’s audience insights with SeenThis’ adaptive streaming capabilities, the partnership promises a more cohesive full‑funnel experience—from awareness on news sites to conversion on e‑commerce pages.
Technical overview of the S2S connection
The server‑to‑server workflow operates as follows:
- Audience definition – An advertiser creates a Custom Audience on Amazon Ads, typically based on purchase history, browsing behavior, or product affinity.
- Secure transmission – SeenTrue’s ad server sends a request containing the audience ID and campaign parameters to Amazon’s API endpoint over an encrypted channel.
- Real‑time matching – Amazon matches the request against its user database, returns a list of eligible identifiers, and authorizes the impression.
- Ad delivery – SeenTrue streams the video creative using its proprietary adaptive bitrate technology, ensuring optimal playback across device types and connection speeds.
Because the exchange occurs entirely on the back end, user‑level data never passes through the browser, a design that aligns with emerging privacy regulations such as the EU’s Digital Services Act and California’s privacy statutes.
First‑to‑market partner: Stackline
The integration is already live, with Stackline becoming the inaugural partner to run a campaign using the new S2S pathway. Stackline, a data‑driven marketing platform, leveraged the connection to activate Amazon Custom Audiences for a client in the consumer electronics sector. According to Stackline’s campaign lead, the experience demonstrated “seamless activation, low latency, and measurable lift in video completion rates compared with baseline programmatic buys.”
The early success suggests that other agencies and brands may follow suit, especially those that have struggled to reconcile Amazon’s audience data with their existing programmatic stacks.
Business implications for advertisers
From a performance standpoint, the integration could reduce the fragmentation that often plagues multi‑platform campaigns. Brands can now run a single video creative, target the same audience segment on Amazon and on third‑party sites, and compare outcomes in a unified reporting dashboard. This consistency simplifies attribution models and may improve return on ad spend (ROAS).
Moreover, the ability to serve video ads on the open web expands inventory options beyond Amazon’s limited placements. Premium publishers—ranging from news outlets to high‑traffic lifestyle sites—can now receive video impressions that are directly linked to Amazon’s shopper intent data. For advertisers, this translates into a broader reach without sacrificing the relevance that first‑party data provides.
Competitive context
SeenThis is not the only player attempting to bridge Amazon’s audience data with external inventory. Companies such as The Trade Desk and MediaMath have previously offered pixel‑based solutions that ingest Amazon IDs through third‑party data partners. However, those approaches often involve additional latency and can be hampered by cookie‑blocking technologies.
By contrast, a pure S2S integration sidesteps many of those hurdles. The move also positions SeenThis ahead of rivals that still rely on client‑side data collection, potentially giving it a competitive edge in the increasingly privacy‑centric ad tech landscape.
Industry reaction
Analysts at Forrester noted that “server‑to‑server integrations are becoming the de‑facto standard for high‑value audience targeting, especially as browsers clamp down on third‑party cookies.” They added that the partnership “illustrates how niche technology firms can create differentiated value by enabling brands to exploit first‑party data across the broader programmatic ecosystem.”
Similarly, eMarketer’s senior research director highlighted that the open‑web video market is projected to exceed $20 billion in spend by 2027, and that “solutions that combine premium video formats with robust audience data will likely capture a disproportionate share of that growth.”
Potential challenges
Despite the promise, the integration is not without obstacles. First, advertisers must still navigate Amazon’s audience creation policies, which can be stringent regarding data usage and segmentation granularity. Second, the success of the S2S link depends on the reliability of both parties’ APIs; any downtime could disrupt campaign delivery. Finally, measurement remains a complex issue—while SeenThis can report on video completion and viewability, linking those metrics back to downstream purchase actions on Amazon will require robust cross‑platform attribution.
Outlook for the open‑web video ecosystem
If the SeenThis‑Amazon partnership gains traction, it could accelerate a shift toward more data‑rich, server‑based ad buying across the open web. Brands that have traditionally siloed their Amazon advertising from broader programmatic efforts may begin to view the two as parts of a single funnel, rather than separate channels.
The integration also aligns with Amazon’s broader strategy to make its audience data accessible to external platforms, a move that mirrors its earlier collaborations with Google Cloud and Salesforce for data‑exchange services. As more advertisers adopt S2S solutions, we may see a convergence of measurement standards and a reduction in the “walled garden” effect that has characterized digital advertising for the past decade.
Conclusion
SeenThis’ server‑to‑server connection with Amazon Ads marks a notable step toward unifying first‑party audience data with the expansive inventory of the open web. By enabling video campaigns that target Amazon Custom Audiences across premium publishers, the integration offers advertisers a more cohesive, privacy‑friendly way to extend their reach while maintaining the relevance of Amazon’s shopper insights. Early adoption by Stackline suggests the solution is functional and effective, and industry analysts view it as a forward‑looking development in a market that increasingly values server‑based data exchanges.
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