What Is The Trade Desk? An Independent DSP, Kokai and UID2

The short answer: The Trade Desk is a demand-side platform, software that bids for ad impressions in real-time auctions, built for agencies and large brands rather than a marketing lead with a company card: no price list, no self-signup, no published minimum, access through a contact form, and once inside, an AI weighing up to 15 million ad opportunities a second (platform page, checked on 5 November 2026). If an agency buys your media, its trading desk is probably on it already; if you spend less than an agency will manage, StackAdapt, which publishes no minimum, is the self-serve door (StackAdapt plans).

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Before you ask for access:

1. Turn the budget into households. For example, EUR 30,000 a month of connected TV at a EUR 12 CPM buys 30,000 / 12 x 1,000 = 2,500,000 impressions, or 2,500,000 / 3 = 833,333 households at a frequency cap of 3; the CTV page advertises more than 185 million streaming households (CTV page).
2. Count the customers you can hash. Emails, raw or hashed, become UID2s, or EUIDs in Europe and the UK; email or phone uploads need a signed service agreement unless you already hold UIDs (data onboarding guide).
3. Name the measure before the first bid. Scheduled reports arrive daily with a one-day delay, raw event feeds near real time (reporting guide); pick the measurement partner and the baseline first.

A DSP, in the vendor's own words

Its glossary defines a demand-side platform as an ad platform that helps advertisers buy ads through real-time bidding exchanges, and a trading desk as a unit inside an ad agency that buys programmatic ads for clients (glossary). The Trade Desk is the first; many of its users sit in the second. It owns no media, its case for independence. The channels are audio, connected TV, digital out-of-home, mobile, display, native and video (homepage), worked by a trader in what the platform page calls a self-serve experience.

Kokai, Koa, UID2 and contextual segments

Kokai has been the platform's name since June 2023 (press release); Koa is the AI inside it, since 2018, refining bidding, pacing and delivery (AI page). UID2 is an open-source identifier hashed and encrypted from a consented email or phone number, for buying logged-in audiences without third-party cookies (glossary); EUID is the European version (EUID). Contextual segments sit in the Contextual (X) tile, third-party and in-house, targeted or blocked by topic and grouped across providers with and/or logic since a March 2026 update (contextual update).

Who it suits

Agencies with a trading desk, and brands with an in-house programmatic team and a contract. The company calls itself the leading independent DSP for data-driven marketers (about page); "largest", the word searchers use, is not on its pages, so do not quote it as the vendor's claim. A EUR 5M business buying Meta and Google search has no reason to be here yet.

What it costs

No price is published: the contact form offers partnership opportunities (contact page, checked on 5 November 2026), and the API guide sends new accounts to a Business Development or Client Services lead to discuss setup fees (platform API guide).

Edge Academy is the one part you can use without a contract: a free course library whose Trading Essentials course now teaches Kokai (Edge Academy). A trader trained for nothing on Kokai buys through Kokai, which is why the lessons are free. Take them anyway.

How it compares

Google Display & Video 360. Enterprise campaign management in one tool, and where YouTube Reserve and TrueView inventory is bought; choose it when YouTube is the plan.

Amazon DSP. Now inside Amazon Ads Agent under advanced settings, self-service or managed, priced through an account executive. Choose it when Amazon's properties are the audience.

StackAdapt. Basic and Grow are self-serve with no minimum spend, though the page suggests about $5,000 a month for results; choose it when nobody is going to manage you. Meta Ads and Google Ads take a card and no contract, and are not DSPs.

Where to start

How to use The Trade Desk runs a first CTV campaign: access, a hashed customer list for suppression, contextual segments, Koa under a ceiling, the reports.

FAQ

Is The Trade Desk a DSP?

Yes, by its own definition: advertisers buy impressions in real-time bidding exchanges from one interface (glossary). It sells no inventory of its own.

Can I sign up on my own?

No. The route in is the contact form, an agency that holds a seat, or an API account created by an Account Manager (platform API guide).

Where do contextual segments come from?

Third-party contextual data partners and The Trade Desk's own, built from URL and keyword data and chosen in the Contextual (X) tile (contextual tools).