When a buy-side agent negotiates directly with a sell-side agent, several of the intermediary layers that currently sit between advertiser and publisher become unnecessary. The supply chain does not disappear: the negotiation, approval, and audit functions move to a different layer, one owned by the parties to the deal rather than by the intermediaries between them.

At a glance

Agent-to-agent negotiation: a deal process in which a buy-side AI agent and a sell-side AI agent negotiate terms directly, without human-mediated intermediaries in the negotiation loop. Humans retain approval rights at the deal level.

Supply path optimisation (SPO): the process of identifying and eliminating redundant or low-value intermediary hops between advertiser and publisher. SPO has historically required manual audit; agent-to-agent negotiation makes path reduction structural.

Intermediary: any technology or company that sits between advertiser and publisher in the buying chain, taking a fee for facilitating the connection. In programmatic, this includes SSPs, DSPs, exchanges, and the API layers between them.

Bilateral deal record: a deal document owned jointly by buyer and seller, containing the agreed terms, approval history, and audit trail. In agent-to-agent trading this replaces the fragmented deal data that currently lives across multiple intermediary platforms.

What the current ad supply chain looks like

In programmatic advertising, a buyer uses a DSP to bid for inventory that a publisher makes available through an SSP. The auction runs on an exchange. Each layer charges a fee, and each layer introduces latency, opacity, and a point at which deal data is interpreted, modified, or lost.

Estimates of how much of each programmatic dollar reaches a publisher vary, but the Trade Desk's analysis of its own supply chain suggested around 50 cents in every dollar reaches working media. The rest funds the intermediary stack.

Supply path optimisation emerged as a buyer-side practice to audit these hops and eliminate the lowest-value ones. It is a manual, periodic process that requires significant analyst time and still leaves the underlying structure intact.

How agent-to-agent negotiation changes the structure

When a buy-side agent and a sell-side agent negotiate directly using a shared protocol, they do not need an exchange to intermediate the transaction. The exchange's role was to provide a common language and a neutral meeting point. A shared protocol like AAMP or A2A does this at the infrastructure level, without requiring either agent to go through a third-party system.

What remains: the buy-side agent (acting on a brief from the advertiser), the sell-side agent (acting on behalf of the publisher), and the marketplace that provides the negotiation infrastructure and holds the bilateral deal record. What is removed: the API connections to multiple SSPs, the exchange auction layer, and the separate DSP intermediation.

This is not a marginal reduction. It is a structural change to where value sits in the chain. The negotiation layer becomes infrastructure that serves both parties rather than a fee layer that serves neither.

What the deal record looks like in agent-to-agent trading

In programmatic, deal data is fragmented. The DSP holds the buyer's data. The SSP holds the seller's data. The exchange holds the auction data. None of these records is shared between buyer and seller, and reconciliation between them is a significant operational task.

In agent-to-agent trading, the deal record is created at negotiation and owned bilaterally. Both buyer and seller have the same record: agreed terms, approval timestamps, any changes made between proposal and activation. The audit trail is native to the deal, not reconstructed after the fact.

This changes how disputes are resolved, how brand safety accountability works, and how campaign performance is attributed. A shared deal record is the governance layer that makes direct agent trading operationally safe.

What stays the same

Planning tools, DSPs, ad servers, measurement platforms, and finance systems are not displaced by agent-to-agent negotiation. Those remain authoritative in their domains. The change is in the negotiation and deal governance layer, not in activation or measurement.

Human approval also stays. A buy-side agent proposes deal terms; a human buyer reviews and approves before the deal activates. An agent that can negotiate a deal without any human checkpoint is a different and riskier proposition. The reduction in intermediaries should not be confused with a reduction in human oversight.

Frequently asked questions

What intermediaries does agent-to-agent negotiation remove? Direct agent negotiation removes the exchange auction layer and the API connections to multiple SSPs and DSPs that currently intermediate the transaction. The buy-side agent and sell-side agent connect through a shared protocol rather than through third-party systems.

Does agent-to-agent negotiation eliminate all supply chain costs? No. The marketplace infrastructure that enables agent-to-agent trading has a cost. The difference is that cost goes to infrastructure that serves both parties rather than to intermediaries that extract fees from the transaction without adding proportionate value.

What is a bilateral deal record and why does it matter? A bilateral deal record is a single document owned jointly by buyer and seller containing agreed terms, approval history, and audit trail. It replaces fragmented deal data held across separate DSP, SSP, and exchange systems. The shared record makes dispute resolution, brand safety accountability, and performance attribution cleaner.

Does agent-to-agent negotiation remove human oversight? No. Human approval at the deal level is a core governance requirement. The agent negotiates; the human approves before activation. Fewer intermediaries does not mean less oversight, it means oversight shifts from intermediary platforms to the buyer and seller directly.

What protocols enable agent-to-agent advertising negotiation? AAMP (Agentic Advertising Management Protocols, IAB Tech Lab) provides the standard for agent communication in advertising. The A2A Protocol handles agent-to-agent communication at the infrastructure level. Platforms built on these open standards are interoperable across the ecosystem.

How agent-to-agent negotiation reduces ad supply chain intermediaries