How CTV Buying Works: Distribution, Supply, Identity, and Frequency
How connected TV buying works: publishers and distribution platforms, SSPs and deals, household identity, frequency, measurement, and buyer controls.
The short answer
CTV buying connects advertisers to ads shown in streaming video on TV screens. Inventory comes from streaming publishers and from distribution platforms such as smart TV makers and device operators. It is sold directly or through SSPs and DSPs, targeted using household identity data, and capped and measured at the household level. Buyers control which supply paths they use, how audiences are defined, how frequency is managed across apps, and how results are verified.
CTV looks simple from the outside: TV ads, bought like digital. Inside, it is one of the more complex supply chains in advertising. Many parties can sell the same ad slot, identity is household-based and patchy, and frequency spreads across apps that do not talk to each other. This guide maps the moving parts.
The parties
| Party | Role |
|---|---|
| Streaming publishers | Own content and most ad slots |
| Distribution platforms | Smart TV makers, device platforms, and operators that carry apps and often get a share of ad slots |
| Syndication partners | Package and resell publisher inventory across platforms |
| SSPs | Run auctions and deals for sellers |
| DSPs | Buy for advertisers |
| Identity and data providers | Link devices to households and audiences |
| Measurement and verification | Count, verify, and measure outcomes |
The same episode of a show can be monetized by the publisher, by the device platform through a revenue share, and by resellers. The distribution deals article explains how.
How inventory is sold
- Direct or programmatic guaranteed. Fixed price and volume with a publisher.
- Private marketplace (PMP). Negotiated deals through an SSP.
- Open auction. Broad, cheap, and least transparent in CTV.
Pharma buyers usually lean on direct and PMP deals for control. See direct vs. PMP vs. open auction.
Supply quality
CTV has had problems with spoofed apps and misrepresented inventory. Tools to check supply:
- app-ads.txt shows which sellers the app authorizes.
- sellers.json identifies the sellers paid.
- SupplyChain object shows the path the impression took.
The CTV supply chain audit shows how to use them, and CTV SSP take rates covers fees.
Identity and targeting
CTV targeting depends on linking TV devices to households: IP addresses, device IDs, and identity graphs. Accuracy varies. For health, targeting must also follow privacy rules. See household-level data in CTV and CTV device graphs.
Contextual targeting by show, genre, or network avoids some identity limits. See contextual CTV forecasting.
Frequency
Frequency is CTV's biggest practical problem. A household can see the same ad on several apps, each with its own cap. Solutions involve buying through fewer paths, using a DSP that caps across them, and measuring frequency independently. See deduplication vs. frequency capping and effective frequency.
Measurement
- Delivery and completion. Basic, reported by every partner.
- Reach and frequency. Needs household-level deduplication across partners. See reach without cookies.
- Outcomes. For pharma, Rx or health action measurement through privacy-safe matching. See CTV incrementality.
What health buyers control
- Which publishers and paths they buy.
- How audiences are defined and reviewed for privacy.
- Frequency rules across the whole plan.
- Verification and measurement partners.
- Creative that meets fair balance requirements for TV. See pharma CTV creative.
Common mistakes
- Buying the same publisher through many paths.
- Trusting each partner's own reach count.
- Ignoring app-ads.txt and sellers.json in CTV.
- Assuming household targeting is precise.
Practical takeaway
List every path your CTV spend took last quarter: publisher, platform, SSP, and reseller. If the list is long and you cannot name the top ten publishers by spend, start with supply consolidation before adding any new audience strategy.
Frequently asked questions
What is the difference between CTV and OTT?
CTV refers to the TV device (smart TVs, streaming sticks, consoles). OTT refers to streaming content delivered over the internet, on any device. Buyers often use the terms loosely.
Who sells CTV inventory?
Streaming publishers, smart TV and device platforms that control some ad slots, and SSPs and resellers that package inventory from many sources.
Can CTV target individuals?
Usually not. CTV targeting and measurement work mostly at the household level, using IP addresses, device IDs, and identity graphs.
Sources
- IAB Tech Lab, ads.txt and app-ads.txt
- IAB Tech Lab, sellers.json
- IAB Tech Lab, OpenRTB
- Media Rating Council, Standards and Guidelines
External guidance and platform documentation change. Links were current at publication; check them again before relying on them for a decision.
Editorial note. Analysis and frameworks are the author's own and do not represent Acxiom or any current or former employer, client, or named platform. Examples labeled hypothetical or illustrative are not results from real campaigns. Nothing here is legal, regulatory, or medical advice.
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