Last updated: 13 October 2026

No. A small or medium advertiser does not need a trading desk to buy connected TV (CTV) advertising. A trading desk is one route into CTV, built for advertisers whose budgets justify specialist traders and negotiated deals. Smaller advertisers can buy through a self-serve platform, a managed service, a publisher directly or a smaller independent agency. Each route gives up something a desk provides: bargaining power, access to private deals, or a clear view of where the money went.

TL;DR. A trading desk operates programmatic buying platforms and negotiates deals for advertisers; it is useful at scale but not required to buy CTV. The main alternatives for smaller budgets are self-serve platforms, managed service, buying direct from a publisher and using a small independent agency. Each trades off the advertiser's time, its control, the inventory it can reach and how much of the supply chain it can see. AI agents negotiating within an advertiser's mandate could lower the cost of reaching negotiated deals, provided both sides hold the same record of the agreed terms.

What does a trading desk actually do in a CTV buy?

A trading desk is a team, usually inside an agency group or a large advertiser, that buys media programmatically. It holds seats on demand-side platforms (DSPs), runs campaigns and negotiates private marketplace and programmatic guaranteed deals with publishers.

In CTV, a trading desk contributes three things: access, because publishers will set up private deals for an established buyer; bargaining power, because pooled spend earns better terms than one small advertiser could; and operating skill, from people who know how to cap frequency across devices and spot inventory that is not what it claims to be.

None of the three is required to buy a CTV impression. The question for a smaller advertiser is which it can replace and which it must do without.

Can a small or medium advertiser buy CTV without a trading desk?

Yes. CTV inventory is sold through several channels that do not require a desk, from self-serve platforms with small minimum budgets to broadcaster and streaming sales teams that sell direct. What changes without a desk is less whether a smaller advertiser can buy CTV and more what it can buy. Open marketplace CTV inventory is widely available. Premium broadcaster and streaming inventory is more often sold through negotiated deals with minimum spends, which are harder to reach without volume or a relationship.

What are the main routes into CTV for a smaller budget?

Self-serve platforms. The advertiser sets up an account, uploads a video creative, chooses targeting and pays for delivered impressions. Self-serve keeps control with the advertiser and usually has the lowest entry point. The cost is time: someone in the business has to run the campaign and judge the inventory.

Managed service. A CTV ad platform or specialist team runs the campaign for the advertiser. The advertiser gives up some visibility into how inventory was chosen and what share of the budget reached the publisher.

Direct with a publisher. Some broadcasters and streaming services sell to smaller advertisers through their own sales teams or self-serve tools. Buying direct gives certainty about placement, but limits reach to one publisher and often carries a minimum spend.

A small independent agency. An independent agency can bring planning and buying skill without holding-group scale. The advertiser should ask which platforms the agency buys through and whether it can show the supply path for each impression.

What does a smaller advertiser give up without a trading desk?

The largest gap is visibility of the supply chain. The ISBA and PwC programmatic supply chain study, published in May 2020, found that publishers received 51% of UK advertiser spend, and that roughly 15% of spend could not be attributed to any part of the chain, the so-called "unknown delta". Only 12% of impressions could be matched from end to end. A follow-up published in January 2023 reported a match rate of 58% and an unknown delta of 3%, but that study covered the premium end of the market only. Neither study was specific to CTV, but both show how hard programmatic money is to trace.

The second gap is bargaining power: a desk negotiating for many clients can ask for delivery commitments and makegoods that a small advertiser rarely gets. The third is operating skill, because household frequency, shared screens and app-based supply all need judgement to read correctly.

How can a smaller advertiser check what it is buying?

A smaller advertiser can check its supply chain with the same public files a trading desk uses. Ads.txt, introduced by IAB Tech Lab in 2017, lets a publisher list the companies authorised to sell its inventory, and its app-ads.txt counterpart does the same job for apps, including CTV apps. Sellers.json, introduced in 2019, lets a supply-side platform disclose the sellers it represents.

Beyond the files, three requests cover most of the risk: a list of the named apps and channels where the advertisement ran, not a category such as "premium streaming"; confirmation of whether inventory came direct or through resellers; and the agreed price, volume and shortfall terms in writing before launch.

How could AI agents change CTV buying for smaller advertisers?

AI agents could narrow the gap between a trading desk and a smaller advertiser by lowering the cost of negotiation. A buyer agent works from a mandate set by a person: the budget, price ceiling, target audience, acceptable environments and the commitments that need human sign-off. Within it, the agent can request proposals from several sellers, compare them and negotiate, while a seller agent applies the publisher's price floors and deal rules.

The standards for this are being built in the open. IAB Tech Lab's AAMP framework, the Agentic Advertising Management Protocols, includes reference buyer and seller agents and OpenProposal, a specification for how publishers describe products and packages in RFP responses. According to IAB Tech Lab, AAMP's support for the Deals API covers programmatic guaranteed, preferred deals, private marketplaces and the open marketplace, the deal types a trading desk already uses. AdCP, the Ad Context Protocol from AgenticAdvertising.org, is a separate protocol with a similar aim.

Agents still need checking. In Concourse Bench v1, a benchmark of AI buying agents negotiating with software sellers, 55 of 96 attempts ended in a completed buy, and 95 of the 110 contracts signed promised a viewability floor below 70%. Completing a deal and getting good terms are different results.

The record of what was agreed matters as much as the negotiation. In the Agree. Transact. Verify. simulation, buyer and seller records kept separately disagreed in 95.3% of 90,202 simulated deals, against 0.19% when both sides worked from one shared record. Alkimi, an agentic advertising marketplace that works within IAB Tech Lab's AAMP framework, is built on that principle: buy-side and sell-side agents agree terms on a shared DealSheet that both parties hold, and humans keep approval rights at the deal level.

Frequently asked questions

Do you need a trading desk to buy CTV advertising?

No. Smaller advertisers can buy CTV through self-serve platforms, managed service, publishers directly or independent agencies. A desk adds bargaining power, deal access and operating skill, but is not a requirement.

What is the cheapest way for a small business to start with CTV?

Self-serve platforms usually have the lowest entry point. The advertiser pays with its own time instead, running the campaign and checking inventory quality itself.

Can smaller advertisers access premium CTV inventory?

Sometimes. Premium broadcaster and streaming inventory is often sold through negotiated deals with minimum spends, but some is reachable through publisher self-serve tools, private marketplace packages or agencies that already hold deals.

Can an AI agent replace a trading desk for CTV?

Partly. An agent can request proposals, compare offers and negotiate within a mandate. It cannot set its own mandate or carry accountability for the spend, and its agreed terms need to be recorded in a form both buyer and seller hold.

Do You Need a Trading Desk to Buy CTV? What Smaller Advertisers Can Do Without One