The most common question Alkimi receives from buyers and publishers encountering the term "agentic marketplace" for the first time is a reasonable one: is this another ad exchange? Both involve connecting buyers and sellers of media inventory. Both provide a mechanism through which advertising is transacted at scale. On the surface, the similarity is plain. The difference is structural, and it is significant enough to be worth explaining clearly rather than leaving buyers to infer it.

What is an ad exchange, and what does it do?

An ad exchange is a clearinghouse. It provides a mechanism for buyers and sellers to transact on advertising inventory at price, at speed, and at scale. The exchange sets the rules of the auction, processes the bids, determines the winner, and routes the creative. It does not hold a position on what the buyer should buy or what the seller should accept. It provides the mechanics of the transaction without taking a view on the quality of the deal.

The exchange's value proposition to buyers is access to inventory at scale. Its value proposition to publishers is demand at scale. The mechanism that enables both is the standardised auction, which allows many buyers to compete simultaneously for many impressions without bilateral negotiation between each pair. The exchange owns the auction mechanics. Everything else, the buying strategy, the inventory packaging, the creative, the measurement, remains in the systems of the buyer and publisher respectively.

Ad exchanges have been enormously successful at what they do. The open exchange model has genuine virtues: liquidity, price discovery, access to inventory that would otherwise require direct relationships to reach. It also has well-documented limitations: opacity, fraud, brand safety risk, and the accumulation of intermediary layers that reduce the proportion of a buyer's budget that reaches working media.

What is an agentic marketplace, and what does it do?

An agentic marketplace is a negotiation and governance layer. It provides the infrastructure for AI agents representing buyers and sellers to negotiate directly, commit to bilateral deal terms, and maintain a shared record of what was agreed and why. It is not a clearinghouse for auctions. It is the mechanism through which agents that have already been authorised to act on behalf of their principals reach agreement with each other.

The distinction is not just operational. It reflects a different theory of what the infrastructure between buyers and sellers should do. An exchange assumes that price is the primary variable to be settled at the point of transaction, and that strategy has already been determined. An agentic marketplace assumes that strategy is itself being determined by the agents in conversation, and that what needs to be captured is not just the price but the terms, the constraints, and the approvals that govern the deal.

What does Alkimi own, and what stays in customer systems?

Alkimi owns three things: the deal record, the approvals workflow, and the audit trail. The deal record is the bilaterally owned document that captures what was negotiated, under what terms, with what constraints, and on behalf of which principals. The approvals workflow is the mechanism through which human principals retain oversight rights at defined points in the negotiation. The audit trail is the log of what happened, in what sequence, and who authorised what.

What stays in customer systems is everything else. Planning lives in the buyer's planning tools. Inventory management lives in the publisher's systems. Ad serving and creative management live in the platforms that buyers and publishers already use. Measurement and reporting live in the analytics systems that each party has already invested in. Finance and billing remain on both sides of the transaction. Alkimi does not require either party to move any of this. The marketplace handles the one part of the workflow that the existing stack was not built for: agent-to-agent negotiation and the deal governance that makes it accountable.

Why is bilateral ownership of the deal record significant?

In current programmatic buying, the deal record, in the sense of a document that captures what was agreed and on what terms, is either absent or held by a platform intermediary. Insertion orders and campaign settings live in the buyer's DSP. Publisher deal terms live in the publisher's SSP. The two views of the same transaction are not necessarily reconciled in a single document that both parties own.

When disputes arise, each party pulls records from their own system. The records may not agree. Resolution depends on which party's system is treated as authoritative, and on the contractual language in the insertion order, which was typically not written with machine-speed agentic transactions in mind.

A bilaterally owned deal record changes this. Both buyer and seller have the same view of what was agreed. Dispute resolution starts from a shared document rather than a comparison of two internally-generated reports. When an AI agent committed to terms on behalf of a buyer, the buyer can see exactly what those terms were, because the deal record is theirs as much as it is the seller's.

Why is an agentic marketplace not a replacement for the existing stack?

The question Alkimi is sometimes asked is whether an agentic marketplace makes exchanges, DSPs, SSPs, or other components of the programmatic stack redundant. The answer is no, for a straightforward reason: an agentic marketplace does not do what those systems do. It does something they were not built to do.

Exchanges provide price discovery and liquidity at scale. DSPs provide campaign management, audience targeting, and bidding optimisation. SSPs provide publisher yield management and access to demand. These remain genuinely useful services whether or not agents are doing the buying. What they do not provide is the negotiation layer between agents, the deal governance that makes autonomous action accountable, or the bilateral deal record that ensures both parties have the same view of what was committed.

Alkimi is the layer between agents that the existing stack cannot provide, built on top of the infrastructure the industry has already constructed. It is a complement to the stack, not a replacement. The distinction matters because it determines how buyers and publishers should think about integrating with an agentic marketplace: not as a migration away from existing systems, but as an addition of a capability that those systems do not currently offer.

What does this mean for how buyers should evaluate Alkimi?

The right question for a buyer evaluating Alkimi is not "should I use this instead of my current exchange relationships?" The right question is "do I intend to deploy AI agents to buy media on my behalf, and if so, what infrastructure will govern those agents' negotiations and commitments?" If the answer to the first part of that question is yes, the answer to the second part is what the agentic marketplace provides.

An ad exchange handles the mechanics of a transaction after a strategy has been decided. An agentic marketplace handles the negotiation through which a strategy is executed by agents, and the governance infrastructure that makes that execution accountable. They are different things, serving different moments in the buying process, built for different actors on each side of a transaction. The confusion between them is understandable. It is also worth resolving before procurement decisions are made.