DSP vs SSP: How Programmatic Ads Work on Amazon

Most advertisers never touch an SSP. Every programmatic impression you buy still passes through one, and what happens there decides the price, the placement and how much of your money reaches the publisher.

This guide explains DSPs and SSPs in plain terms, walks one impression from page load to ad, then maps it onto Amazon as it works in late 2026.

DSP vs SSP: The Short Answer

A demand-side platform (DSP) is software advertisers and agencies use to buy ad impressions automatically across many sites, apps and streaming services. A supply-side platform (SSP) is software publishers use to sell those impressions to many buyers at once.

The two sit on opposite sides of the same trade. A DSP wants the right viewer at the lowest price; an SSP wants the highest price for each impression it sells.

Amazon's own guide to supply-side platforms puts it simply: SSPs "provide similar functionality and technology, but are used by publishers."

The SSP names above are the five Amazon has certified in its supply program, which we cover below. They're industry examples, not recommendations.

What Is a Demand-Side Platform (DSP)?

A DSP lets an advertiser set an audience, a budget, a bid and a goal once, then buys matching impressions one at a time across thousands of publishers. Without it, you'd negotiate with each site separately.

Amazon's guide to demand-side platforms describes it as buying "across multiple exchanges in real time." Every DSP does four jobs:

1. Targeting. It decides whether a viewer belongs to an audience you want, using its own data, your data or third-party segments.

2. Bidding. It prices each impression against your goal, such as reach, detail page views or purchases.

3. Pacing and control. It spreads budget over the flight and enforces frequency caps and brand safety rules.

4. Measurement. It reports what the impressions led to.

What separates one DSP from another is mostly the data behind steps 1 and 4. Amazon DSP targets with shopping, browsing and streaming signals and measures sales in the Amazon store, which general-purpose DSPs can't see.

Our guide to what Amazon DSP is and how it works covers the buy side in depth, including costs and minimums. Retailers run the same model on their own data, as our Walmart DSP guide shows.

If you're choosing between Amazon's self-serve display ads and the full DSP, start with our Amazon DSP vs Sponsored Display comparison.

What Is a Supply-Side Platform (SSP)?

An SSP lets a publisher offer every ad slot to many buyers at once instead of selling it to one ad network. Amazon defines it as "programmatic software for publishers to facilitate sales of their advertising impressions."

A publisher uses an SSP to:

• Set floor prices, the minimum CPM it will accept for a slot.

• Choose who can buy, from the open market to a short list of invited buyers.

• Set ad quality rules, such as blocked categories, competitors or creative types.

• Package deals, so a buyer can reach specific inventory on agreed terms.

• Report yield, meaning revenue per thousand ad requests, by buyer and by slot.

The SSP then runs or joins the auction, and the highest valid bid wins. It bills the buyer, keeps its fee and pays the publisher.

Advertisers rarely log into an SSP. You still feel its decisions: the floor sets your minimum price, and the publisher's buyer rules decide whether your DSP is even invited.

How One Impression Flows From Publisher to Advertiser

Every programmatic impression is sold in a few steps, all while the page, app or stream loads. Amazon's PMP guide says the auctions happen "in less than a second."

1. A Viewer Opens a Page, App or Stream

An ad slot needs filling. On a website, header bidding code in the page calls for bids; in an app or on a connected TV, the app's software development kit (SDK) or the streaming server does the same.

2. The SSP Packages a Bid Request

The SSP describes the impression: slot size, site or app, device, approximate location, the floor price and any deal IDs. It doesn't send a name; buyers match the device or household to their own audiences.

3. The Exchange Sends It to DSPs

The request goes to every connected DSP, usually in OpenRTB, the IAB Tech Lab's standard format for real-time bidding. Most SSPs run their own exchange, so in practice "SSP" and "exchange" often mean the same company.

4. Each DSP Decides and Bids

The DSP checks whether this viewer is in one of your audiences, whether you've hit your frequency cap and whether the site passes your brand safety rules. If it does, the DSP prices the impression and bids.

5. The Ad Server Picks the Winner

The publisher's ad server, such as Google Ad Manager, compares programmatic bids with its directly sold campaigns and picks the winner. The ad server is the publisher's final decision maker; the SSP is one source of bids feeding it.

6. The Ad Serves and Gets Measured

The winning creative loads. The SSP bills the DSP and pays the publisher, and the DSP records the impression and whatever the viewer does next.

On Amazon, "next" can include a detail page view, an add to cart or a purchase. That closed loop is why brands buy Amazon DSP rather than a DSP that only sees clicks. Brands that don't sell on Amazon can still buy it for the audiences and send viewers to their own site.

The Rest of the Stack: Exchanges, Ad Servers, Header Bidding and DMPs

DSPs and SSPs are the two platforms people compare, but four other pieces decide how an impression is sold.

Header Bidding vs the Waterfall

Before header bidding, publishers sold through a waterfall. They offered an impression to one buyer at a time, in a fixed order, and moved down the list until someone bid above the floor.

Amazon's header bidding guide says header bidding "allows publishers to simultaneously request bids from multiple demand sources". Everyone bids at once, and the highest bid wins.

Header bidding can run in the browser (client-side), which gives clearer bid data but slows pages, or on a server (server-side), which is faster but shows less. Amazon's own sell-side products are server-to-server, as we'll see.

For advertisers, header bidding is good news. More DSPs see every impression, so the price is set by what the audience is worth to each buyer rather than by who sits first in a publisher's queue.

Supply Path: How Many Hands Touch Your Dollar

The same impression can reach your DSP through different routes. A direct route goes from the publisher's SSP to your DSP; a longer one passes through a reseller exchange that takes its own cut.

The IAB Tech Lab's ads.txt and sellers.json standards let buyers check who is authorized to sell a publisher's inventory and through whom. Supply path optimization is the buy-side habit of preferring the short, authorized routes.

In the example, the direct path puts 11% more of the same $10 into the media itself. The fees are illustrative; yours are in your DSP and publisher contracts.

Deal Types: Open Auction, PMP and Programmatic Guaranteed

Not every impression is sold in an open auction. Publishers and buyers can agree terms in advance and attach them to a deal ID, which the SSP puts in the bid request so the DSP knows which terms apply.

1. Open Auction

Any connected buyer can bid, and the price is set by the auction above the publisher's floor. Amazon's PMP guide calls these open marketplaces, "also known as RTB." Use it for scale, retargeting and audience tests.

2. Private Auction (Private Marketplace, PMP)

Same auction mechanics, but only invited buyers can bid, often with a higher floor. Amazon says private marketplaces "are by invitation only." Use it for curated sites and premium streaming apps.

3. Preferred Deal

One buyer gets a first look at inventory at a fixed CPM, with no volume reserved. Amazon describes preferred deals as "given priority placement." Use it for premium supply without a spending commitment.

4. Programmatic Guaranteed (PG)

A reserved number of impressions at a fixed CPM, with no auction at all. Amazon's guide says PG "promises a certain amount of impressions" and is "decided manually, without bidding." Use it for launches, tentpole events and live sports.

Inside Amazon DSP, one Deals widget lists preferred deals, private auctions and programmatic guaranteed deals together. Since February 2025, self-service advertisers can propose preferred and PG deals with Prime Video, Twitch and Freevee themselves.

Our Amazon DSP deals guide goes through deal IDs, approvals and pricing in detail.

Amazon DSP vs SSP: How Amazon Plays Both Sides

"Amazon SSP" is one of the most searched phrases around this topic, and the honest answer is that Amazon doesn't sell a product by that name. It runs a buy-side platform for advertisers and a set of sell-side services for publishers.

The Buy Side: Amazon DSP, Now Display, Video and Audio Campaigns

On September 29, 2026, at unBoxed, Amazon renamed its unified platform Amazon Ads Agent, "the unified buying experience that brings together what was formerly the DSP and Ads Console." Its conversational AI features are in closed beta and still rolling out.

DSP buying now runs as Display, Video and Audio (DVA) campaigns. In the new naming, an order is a campaign, a line item is an ad group and a creative is an ad.

The simplified DVA+ flow rolls out in the US from late October 2026; DSP users outside the US keep the classic flow for now. Full-Funnel Campaigns are in "open beta for US advertisers who sell on Amazon."

Access hasn't changed much in practice. Self-service runs on budgets you set, with no minimum stated by Amazon; managed service typically needs $50,000, varying by country. Our Amazon DSP campaign setup guide walks through both flows.

The Sell Side: Amazon Publisher Services (APS)

Amazon Publisher Services is Amazon's toolkit for publishers. It doesn't describe itself as an SSP, but it does SSP-like jobs: it runs server-to-server auctions and brings Amazon and third-party demand to a publisher's inventory.

• Transparent Ad Marketplace (TAM): a server-to-server marketplace where "the page or app makes one ad call," aimed at larger publishers. It needs a contract with each demand partner and charges bidders a 2.5% service fee.

• Unified Ad Marketplace (UAM): an invitation-only, server-to-server header bidding integration for publishers on Google Ad Manager. Publishers sign "one click-through contract with APS," and UAM charges a 10% transaction fee before a first-price auction.

• Amazon Publisher Cloud: built on AWS Clean Rooms, it lets publishers combine their own signals with Amazon Ads insights to plan deals, including PG deals for streaming TV.

Amazon's SSP guide confirms the link to the buy side: "Amazon Ads Agent has access to third-party publishers' inventory via Amazon Publisher Services."

Amazon Publisher Direct (APD)

Amazon Publisher Direct is the buy-side view of those relationships: direct access from Amazon DSP to "thousands of premium video, display and audio publishers," with a reporting API showing where ads ran and what you paid.

Because APD skips intermediaries, it's the short supply path from the example above. Amazon's supply quality page adds that guaranteed deals with specific non-Amazon publishers carry a 1% technology fee.

So, Does Amazon Have an SSP?

Not in the way Magnite or PubMatic are SSPs. Amazon runs a DSP, owns huge inventory (Amazon.com, Prime Video, Fire TV, Twitch, Thursday Night Football) that it sells itself, and offers APS so other publishers can sell to Amazon and other buyers.

For an advertiser, the practical takeaway is that Amazon DSP can buy almost any premium supply through one of four routes: Amazon-owned, APD, certified SSPs or direct streaming partnerships.

Amazon's 2025 and 2026 Supply Partnerships

The sell side of Amazon DSP changed more in the last 18 months than in the five years before. Amazon spent 2025 connecting streaming services and SSPs, then spent 2026 deepening them.

Amazon's January 2026 review of its streaming partnerships adds iHeartMedia to the list and says they give Amazon "reach to 80% of streaming households in the U.S."

Certified Supply Exchange: Amazon's SSP Program

The Certified Supply Exchange (CSE) launched on June 13, 2024 with Magnite, PubMatic and Index Exchange. It's how Amazon decides which independent SSPs get preferred access to its DSP's demand.

The July 21, 2026 update lists five certified SSPs: Magnite, PubMatic, Index Exchange, OpenX and Microsoft Monetize. Each is assessed in eight technical areas, including traffic optimization, signal quality and automated deal activation.

Two parts of that update matter to buyers:

• Dynamic Traffic Engine. Amazon shares aggregated demand signals with SSPs before bid requests are sent, so they send more of the impressions Amazon's advertisers want. OpenX, an early adopter, reported 41.4% more revenue per million ad requests; Amazon notes results may not be typical.

• Live sports deals. More than 375 certified deals across 28 sports have been built for Amazon DSP since December 2025, with a Live Events Optimizer for pacing in development.

Other 2026 Supply Changes

• Podcasts and streaming audio. Since July 6, 2026, self-service buyers can use PMP and PG deals on podcasts and streaming audio from Spotify Ad Exchange, SiriusXM Media/AdsWizz and iHeartMedia/Triton.

• Google Ad Manager PG. Since August 10, 2026, Amazon DSP supports publisher-hosted creatives for programmatic guaranteed deals in Google Ad Manager, across 33 countries. Broadcasters that insist on hosting creatives themselves are now buyable.

Our Amazon DSP ad types guide shows the formats that run on this supply, and our Prime Video ads guide covers Amazon's own streaming inventory.

What DSP vs SSP Means for Amazon Advertisers

You don't need to run an SSP to benefit from understanding one. These are the decisions on the buy side that the sell side shapes.

1. Choose Supply on Purpose

In a DVA ad group, or a line item in classic DSP, you choose supply: Amazon-owned, Amazon Publisher Direct, third-party exchanges or specific deals. Don't leave it on everything by default.

We split prospecting by supply type so each one reports on its own. A blended CPM across Prime Video and open-web display tells you nothing.

2. Match the Deal Type to the Job

Open auction for scale and retargeting. PMP or preferred deals for premium streaming and curated publishers. PG only when you need guaranteed volume on specific dates, because you pay for the impressions whether they perform or not.

3. Prefer Short Supply Paths

Where the same publisher is available through APD, a certified SSP and a reseller, buy the direct route. The worked example above shows why: the same CPM buys more media.

4. Keep Audiences Consistent Across Supply

An in-market audience can now run on Prime Video, Netflix, Roku and Spotify in the same campaign. Set frequency caps at the campaign level so a viewer doesn't see your ad on every screen in the house.

Our Amazon DSP targeting guide covers audience and supply settings side by side, and AMC custom audiences let you carry the same segment into every route.

5. Measure Beyond the Click

Streaming and audio impressions rarely get clicked. Judge them on reach, new-to-brand customers and Amazon Marketing Cloud (AMC) paths to purchase, not on click-through rate.

Since January 1, 2026, DSP ads in the Amazon store also use Amazon's new view attribution model, with the old count kept as "all views" metrics. Compare 2026 results with 2025 carefully.

Our Amazon DSP reports guide lists the reports and columns we check weekly, and our full-funnel DSP strategy shows how each route fits a funnel stage.

Mistakes We See With DSP Supply

• Treating DSP and SSP as competitors. They're two halves of one trade. You choose a DSP; the publisher chooses its SSP.

• Buying all supply in one ad group. Prime Video, open-web display and podcasts perform differently. Split them or you can't tell what worked.

• Paying PG prices for open-auction jobs. Guaranteed deals suit tentpoles, not always-on retargeting.

• Ignoring the supply path. The same publisher through a reseller costs more for less media. Check APD and certified routes first.

• No frequency cap across streaming partners. More CTV supply means more ways to over-serve one household.

• Judging streaming on clicks. CTV and audio work on reach and new-to-brand customers, not click-through rate.

How We Run Amazon DSP in Adbrew

Everything above can be done directly in Amazon Ads Agent. The work is in doing it every week, next to Sponsored Ads and AMC, often across several brands.

Adbrew is an agentic retail media management platform for Amazon and Walmart, and DSP runs inside it alongside Sponsored Ads, AMC and Marketing Stream:

• A team that runs DSP with you. Our DSP specialists help plan supply, deals and audiences, and you can run Amazon DSP through Adbrew's seat or connect a DSP account you already hold.

• AMC audiences without SQL. Adbrew's AMC tool builds cart abandoners, repeat viewers and new-to-brand segments in a few clicks and sends them to DSP, so the same audience runs on every supply route.

• Automation you control. Rules you set for bids, budgets, audiences and frequency caps, with thresholds and guardrails you choose and every change logged.

• [Adbrew Intelligence](https://adbrew.io/adbrew-intelligence). Ask for "DSP spend and new-to-brand customers by supply type this month" and the agent builds it from your data. Through Adbrew MCP, the same work runs from Claude or ChatGPT, with changes applied only after you approve them.

More than 5,000 brands, agencies and aggregators use Adbrew, and customers average a 46% decrease in ACOS.

Buy the Supply, Not Just the Audience

On Amazon, the audience is the reason to buy DSP. In 2026 the supply decides where that audience sees you, at what price and with how many hands in the middle.

Want help choosing supply, deals and audiences for your next DSP campaign? Book a demo with our team and we'll map it out on your account.