THE B2B STACK | 8 May; ChatGPT lands in UK + Omnicom guns for the middlemen + DSPs become 'Unified Ad Platforms' + Meta opens its walls
Four moves, one shape — every layer of the stack made an agentic play this week. What it means for B2B buyers running 2026 stack reviews.
The week everyone tried to own the agent layer
No fresh agency-vs-DSP fight. No earnings shocker, exactly. But pull this week’s stories together and you can see something specific happening: every layer of the stack made an agentic move inside five days.
Omnicom is gunning for the adtech middlemen. Yahoo and Kochava formalised a workflow that treats the DSP as a backend service rather than the front door. Meta opened its ad ecosystem to third-party AI tools. And on Thursday, OpenAI confirmed ChatGPT ads are landing in the UK in the next few weeks.
If you sit on the demand side of B2B media, this is the week to stop reading “agentic” as a slide deck term and start treating it as a budget reallocation question.
The orchestration and planning layer — the thing that decides which DSP, which inventory, which audience, which creative, against which signal — is where the next decade of margin sits. Everyone in this week’s news flow is racing to own it.
There is also a quieter story running underneath: a protocol layer is being built in real-time across the industry. Omnicom is using AdCP. Meta is opening through MCP. Yahoo and Kochava are connecting via MCP. The IAB Tech Lab has named the umbrella standard AAMP. The plumbing is being agreed in front of our eyes, and the timeline for “this gets settled” is months, not years.
Four stories that actually move the road in front of you.
1. OpenAI’s ChatGPT ads land in the UK
The story. On 7 May, OpenAI confirmed it would start testing ChatGPT ads in the UK, Brazil, Japan, South Korea and Mexico over the next few weeks (Digiday, Reuters). Earlier in the week, the self-serve ads manager opened to US advertisers of all sizes — restricted categories aside — and OpenAI promised third-party measurement and CPA bidding to address the “is this actually working” question (Digiday, AdExchanger). The ad business is reportedly tracking around $100M annualised after roughly three months live, against a $2.5B 2026 internal target and $100B by 2030 (Axios). For UK context, Black Lab Digital’s analysis last week is one of the better practitioner reads on what UK marketers should be doing now.
My take. Two weeks ago this was a US story with directional UK relevance. Now it is a UK media plan question. Most British B2B marketers I speak to are still treating ChatGPT as a dark funnel they cannot see into. From later this month, that funnel has paid placements in it, in your buyers’ language, with self-serve access and CPA bidding.
The “we will revisit it once it scales” position is now actively expensive — both because your competitors are training the relevance model against your category, and because ChatGPT’s CPC range ($3 to $5 in early reporting) sits materially below LinkedIn for comparable B2B intent. I’d argue it’s at BARGAIN levels right now and it won’t last because it doesn’t direct many clicks, so competition is going to heat up fast.
The bigger structural point: OpenAI just turned its first market expansion into a measurement story rather than a reach story. That is the right move for an ad platform that wants budget rather than experimentation spend. The programmatic testing, which started at an expensive but should-be-defensible $60 CPM, crashed to $25 CPM, and then dissolved into self-service CPC. The testing is a $100m ad business car crash which will win despite the best efforts of those paid to make it fly.
As we were talking about on LinkedIn this week, there is a split growing between Google AI (direct response) and ChatGPT (brand) and where they see the main leaning in this tech.
Programmatic display and CPM bidding backed up brand. CPC into CPA backs up performance/DR.
It baffles me that they are so confused around what they are selling. For me, in B2B, this meets every tickbox for brand advertising — see LinkedIn post below.
OpenAI ChatGPT ads in the UK
Digiday, Krystal Scanlon, ‘Expand thoughtfully’: OpenAI offers ChatGPT ads to new markets including the U.K., Brazil and Japan, 7 May 2026 — link
Digiday, OpenAI opens up ChatGPT ads manager to the U.S. while promising third-party measurement, CPA bidding, May 2026
AdExchanger, POSSIBLE 2026: OpenAI announces CAPI and self-serve ads manager launch, May 2026 — link
Reuters Institute for the Study of Journalism, Felix Simon, Advertising was always going to come for AI chatbots. The real question is how — link
Black Lab Digital, James Starkey, ChatGPT Ads Are Coming to the UK: What Brands Need to Know Now, 6 May 2026 — link
Axios, OpenAI projecting $100bn in advertising revenue by 2030, April 2026
2. Omnicom is testing AI agents to cut out the adtech middlemen
The story. On Omnicom’s Q1 2026 earnings call (28 April), CTO Paolo Yuvienco confirmed the holdco has already executed live agent-to-agent media buys for several clients, using AdCP — the Ad Context Protocol, an open standard that lets AI agents discover inventory, transact, build creative and manage accounts directly with publishers (AdExchanger, Digiday, ExchangeWire, BestMediaInfo). CEO John Wren framed adtech intermediaries as extracting a “toll” paid by clients, and said shortening the path to publishers is now a strategic priority.
The under-reported half of the story: Omnicom is plugging Acxiom — acquired as part of the IPG deal — directly into Omni, the holdco’s AI sales and marketing platform, to build unified customer IDs that feed the agents (AdExchanger). Wren told investors his 2018 decision to walk away from buying Acxiom for $2bn was vindicated; seven years later, he’s bought all of IPG (including Acxiom) for $9bn and the data layer is now the engine for agentic buying.
My take. This is the most consequential story of the week, and it is being read too narrowly.
The headline is “Omnicom builds agents,” and that is the definition of “meh, so what.”
The actual story is: the world’s largest media holdco has decided that the right operational unit for the next era is “holdco plus agent plus first-party data spine” — not “holdco plus DSP plus SSP plus verification plus identity plus ABM platform plus attribution.” Each of those middle-layer point solutions becomes optional — useful where the agent decides it is useful, replaceable where it isn’t.
The DSP market is now getting plundered by SSPs bringing a media + curation + [increasingly an] activation layer — see Index Exchange and Bedrock Platform, who shipped the world’s first containerised DSP bidder running inside the exchange itself on 21 April (AdWeek, ExchangeWire, Index Exchange, Bedrock). This is supply chain compression at its finest.
Now the source of the majority of ad spend, big holding co agency groups, are seeking to use protocol-level tech (AdCP, MCP) to bypass the old world line up of adtech full stop. This is the compression from the cheque book side of the market, and goes even further.
For B2B, this is going to land harder than it does for B2C, and faster. B2B media plans already lean on a super fragmented stack — DSPs, identity vendors, intent providers which are irrelevant in B2C, ABM platforms to score, verification, attribution. Most of that stack exists because no single platform handles the buying-committee-and-intent layer cleanly. Keep your eyes peeled, because we are building something at FunnelFuel which will compact this whole stack and fix this issue — an advertising OS for B2B which upgrades the existing best infrastructure to work for B2B.
An agentic orchestrator that can stitch firmographic, intent and engagement signals across that fragmented set is, structurally, what every ABM tool has been pitching for ten years and never quite delivered. If Omnicom builds it credibly, the rest of the holdcos follow within twelve months, and the independent middle layer has eighteen months to prove it is not worth bypassing.
The B2B implication: if you are running a 2026 stack review, the question is not “which DSP” or “which ABM platform” — it is “which of these tools survive a holdco putting an agent in front of them, and which become commodity execution pipes.”
Omnicom + AdCP + Acxiom
AdExchanger, Omnicom Has An AI-Powered Plan To Cut Out Ad Tech Middlemen, 30 April 2026 — link
Digiday, ‘That is an objective’: Omnicom tests AI agents to cut out the ad tech middlemen, late April 2026 — link
ExchangeWire, Digest: Omnicom Tests AI Agent Media Buying, 30 April 2026 — link
BestMediaInfo, Omnicom says it has executed real client media buys using agent-to-agent AI framework — link
AdExchanger, Media In 2026: From Managed Decline To Ruthless Independence (analyst context on holdco agentic strategy) — link
3. Yahoo + Kochava put a name on the new shape: the Unified Ad Platform
The story. On 5 May, Yahoo and Kochava announced a partnership embedding a Yahoo DSP workspace inside Kochava’s StationOne platform — pitching agentic workflows that operate across multiple DSPs from a single orchestration layer (Digiday, AdExchanger, GlobeNewswire). The technical detail matters: the Yahoo workspace ships pre-defined Skills, Agents, and an MCP Connection between StationOne and Yahoo DSP. Kochava CEO Charles Manning compared StationOne to Slack — “instead of connecting people on your team, the way that Slack does, StationOne connects all the tools that ad ops, media buying teams, or traders use.” On 8 May, Digiday published a “WTF is a unified ad platform” explainer formalising the term coined by W Media Research’s Karsten Weide. Yahoo’s framing is telling: the DSP becomes the “system of record” for performance and brand safety, but campaign logic moves up into the orchestration layer.
My take. The terminology matters because it is the first time the industry has named what has been quietly happening for two years — DSPs and SSPs converging, point solutions getting absorbed, the stack reorganising around fewer, broader players. This is the reality of a long-awaited and long-overdue cleansing of an adtech supply chain which got too caught in its ways for too long, and supported bloated re-selling and arbitrage long past an acceptable end date for a new technology ecosystem. “Unified Advertising Platform” is the box every vendor will now spend 2026 trying to fit themselves into.
Read together with the Omnicom story, this is the same shift seen from two angles. The holdcos want to own the orchestration layer with their own agents. The independent adtech sector wants to own it by merging the middle into a unified product. Whoever wins, the standalone DSP and standalone SSP both lose narrative gravity. They become components, not categories.
For B2B buyers, the pragmatic question is supplier risk. Most B2B media plans are running through partners who built their value proposition in the OpenRTB era — quality of audience, breadth of supply, attribution layer, data layer. Those propositions still hold operationally. They are just losing the narrative to the unified orchestration story. That gap between operational reality and narrative direction is where bad procurement decisions get made over the next twelve months. Don’t let your stack be reorganised by a slide deck before the underlying products have actually changed.
Right now, the reality is that the agentic landscape and the Omnicom way would be stuck trying to navigate and procure messy, small, B2B first party data. B2B data changes over faster than B2C, whether it’s the work email linked to the job that you change every 1–3 years; titles, locations, and everything that goes with it — versus B2C data which remains intact longer. Personal emails that last on average 5x longer than work ones, age ranges, genders, income bands, and the underlying foundations of consumer marketing are significantly more static. Don’t expect agents to be able to locate and find inventory packages for B2B easily. But equally, back AI to find the answers faster than we expect it to.
Yahoo + Kochava + StationOne (the Unified Ad Platform thesis)
Digiday, Ronan Shields, Ad Tech Briefing: Yahoo pairs with Kochava to pitch ‘agentic’ DSP workflows, 5 May 2026 — link
AdExchanger, AI Creates More Ad Tech Frenemies (Yahoo/Kochava alliance context), 6 May 2026 — link
GlobeNewswire (Kochava press release), Kochava Announces New Yahoo DSP Workspace Now Available on StationOne, 5 May 2026 — link
Digiday, WTF is a unified ad platform?, 8 May 2026 — link
W Media Research, Karsten Weide — original UAP framing
Bedrock + Index Cloud (containerised DSP / supply-chain compression)
AdWeek, Index Exchange Welcomes DSPs into New Cloud Infra, Bringing Bidders Closer to Ad Inventory, 21 April 2026 — link
ExchangeWire, Bedrock Debuts Containerised DSP Deployment on Index Cloud, 24 April 2026 — link
Index Exchange press release, Introducing Index Cloud, 21 April 2026 — link
Bedrock Platform, Bedrock Platform Launches the First Containerized DSP in Index Cloud — link
PPC Land, Bedrock becomes first DSP to run its bidder inside an exchange — link
4. Meta opens its ad ecosystem to third-party AI tools
The story. On 5 May, Meta confirmed it would open its ad ecosystem to third-party AI tools (Digiday, Mobile Marketing Reads, Performance Marketing World). The technical detail is the headline that most of the trades buried: the new “Meta Ads AI Connectors” are built on Model Context Protocol (MCP) — the same open standard used by Anthropic’s Claude and OpenAI’s ChatGPT — meaning advertisers can run Meta campaigns through external AI assistants using natural language, without needing API integration or developer credentials. eMarketer’s Jacob Bourne called it “an opening up, but it’s also a subtle lock-in move.” Sonata Insights’ Debra Aho Williamson read it as Meta getting ahead of “concerns about being too closed or controlling.”
My take. Meta is the canary, not the headline. If Meta is opening to third-party AI tools, Google and LinkedIn are next, and the timeline is shorter than “next year.” The reason is that the largest advertisers will not run agentic buying selectively — they will run it across their full media footprint, or not at all. Walled gardens that don’t make their inventory agent-addressable get bypassed in the agent’s recommendation set. That is a structural threat the walled gardens cannot ignore.
The protocol layer is the bigger story. Meta’s connectors run on MCP. Yahoo+Kochava connects via MCP. Omnicom uses AdCP. The IAB Tech Lab named its umbrella initiative AAMP (Agentic Advertising Management Protocols) in February. What looked like a fragmented set of vendor announcements is actually the early phase of a protocol war — and unlike the OpenRTB era, the protocols are being hammered out in months rather than years. Whoever owns the dominant standard owns the rails the next decade of programmatic runs on.
The B2B angle: LinkedIn is the one to watch. LinkedIn’s value proposition for B2B is its account graph plus its inventory access. If LinkedIn goes the Meta route — opening up to third-party agents — then LinkedIn becomes a data layer that any agent can call, not just a destination platform you have to log into. That changes how LinkedIn budget gets allocated, who controls the planning, and how layered targeting actually gets executed across LinkedIn plus open web plus CTV. It is also, by some distance, the most important strategic question for British B2B marketers in the second half of 2026.
LinkedIn will resist longer than Meta did, because its walled-garden margin is more defensible. But the direction is the direction.
What ties this week together
Four moves, one shape. The orchestration layer — the part of the stack that decides what runs where, against which signal, for which outcome — is being claimed by everyone at once. Holdcos want to own it (Omnicom, with Acxiom underneath). Independent adtech wants to consolidate into it (Yahoo+Kochava, the UAP framing, Bedrock running inside Index). Walled gardens want to gate it on their terms (Meta this week, the others soon). And the new ad platforms — OpenAI being the obvious one — want to be a destination inside it.
The middle of the stack — the standalone DSPs, the standalone SSPs, the point-solution intent vendors, the attribution-only tools — is being asked to justify why it shouldn’t be a feature of someone else’s agent.
For B2B specifically, this is genuinely good news, but only if you read it correctly. The 2026 B2B stack has more friction than any other category — buying committees, account-level resolution, intent layering across firmographic and behavioural signal, multi-touch attribution across channels that don’t share identifiers. Agentic orchestration is genuinely the right tool for that problem. The risk is buying the orchestration story before the underlying components have caught up — paying for a unified narrative on top of a fragmented reality, and discovering the seams six months in.
The operators who will do well are the ones running their 2026 stack review on the components first, the orchestration second. Audience quality, signal depth, supply path, identity stitching — those still decide whether your media works. The agent is only as good as what it has to call.
Meta opens to third-party AI tools (MCP)
Digiday, Meta opens its ad ecosystem to third-party AI tools, 5 May 2026 — link
Mobile Marketing Reads, Meta opens ad platform to third-party AI tools in shift toward integrated workflows, May 2026 — link
Performance Marketing World, Meta opens ad accounts to third-party AI tools, May 2026 — link
Marketing Brew, How Meta’s AI push is changing ad creation (April 2026 context) — link
If this landed, forward it to one person who is in the middle of a 2026 stack review. That is who needs to read it.
Reply with what you’re seeing in your own buying — the practitioner threads in this newsletter come from readers, and the more honest the conversation gets, the better the next edition.
Need some help piecing together running addressable programmatic advertising in 2026 - reply to this email or message me at mike [at] funnelfuel [dot] io
Mike
References & further reading
OpenAI ChatGPT ads in the UK
Digiday, Krystal Scanlon, ‘Expand thoughtfully’: OpenAI offers ChatGPT ads to new markets including the U.K., Brazil and Japan, 7 May 2026 — link
Digiday, OpenAI opens up ChatGPT ads manager to the U.S. while promising third-party measurement, CPA bidding, May 2026
AdExchanger, POSSIBLE 2026: OpenAI announces CAPI and self-serve ads manager launch, May 2026 — link
Reuters Institute for the Study of Journalism, Felix Simon, Advertising was always going to come for AI chatbots. The real question is how — link
Black Lab Digital, James Starkey, ChatGPT Ads Are Coming to the UK: What Brands Need to Know Now, 6 May 2026 — link
Axios, OpenAI projecting $100bn in advertising revenue by 2030, April 2026
Omnicom + AdCP + Acxiom
AdExchanger, Omnicom Has An AI-Powered Plan To Cut Out Ad Tech Middlemen, 30 April 2026 — link
Digiday, ‘That is an objective’: Omnicom tests AI agents to cut out the ad tech middlemen, late April 2026 — link
ExchangeWire, Digest: Omnicom Tests AI Agent Media Buying, 30 April 2026 — link
BestMediaInfo, Omnicom says it has executed real client media buys using agent-to-agent AI framework — link
AdExchanger, Media In 2026: From Managed Decline To Ruthless Independence (analyst context on holdco agentic strategy) — link
Yahoo + Kochava + StationOne (the Unified Ad Platform thesis)
Digiday, Ronan Shields, Ad Tech Briefing: Yahoo pairs with Kochava to pitch ‘agentic’ DSP workflows, 5 May 2026 — link
AdExchanger, AI Creates More Ad Tech Frenemies (Yahoo/Kochava alliance context), 6 May 2026 — link
GlobeNewswire (Kochava press release), Kochava Announces New Yahoo DSP Workspace Now Available on StationOne, 5 May 2026 — link
Digiday, WTF is a unified ad platform?, 8 May 2026 — link
W Media Research, Karsten Weide — original UAP framing
Bedrock + Index Cloud (containerised DSP / supply-chain compression)
AdWeek, Index Exchange Welcomes DSPs into New Cloud Infra, Bringing Bidders Closer to Ad Inventory, 21 April 2026 — link
ExchangeWire, Bedrock Debuts Containerised DSP Deployment on Index Cloud, 24 April 2026 — link
Index Exchange press release, Introducing Index Cloud, 21 April 2026 — link
Bedrock Platform, Bedrock Platform Launches the First Containerized DSP in Index Cloud — link
PPC Land, Bedrock becomes first DSP to run its bidder inside an exchange — link
Meta opens to third-party AI tools (MCP)
Digiday, Meta opens its ad ecosystem to third-party AI tools, 5 May 2026 — link
Mobile Marketing Reads, Meta opens ad platform to third-party AI tools in shift toward integrated workflows, May 2026 — link
Performance Marketing World, Meta opens ad accounts to third-party AI tools, May 2026 — link
Marketing Brew, How Meta’s AI push is changing ad creation (April 2026 context) — link
Protocol layer context (AdCP, MCP, AAMP)
Kochava + IAB Tech Lab, Open-Source StationOne AI Workspace using IAB Tech Lab’s AAMP Buyer Agent, March 2026 — link
IAB Tech Lab, Agentic Roadmap initiative (AAMP / ARTF documentation)