Which ad marketplaces support autonomous agent-to-agent bidding?

As of October 2026, agent-to-agent deal negotiation is supported at specialist agentic marketplace platforms that implement machine-readable deal term standards and bilateral deal governance infrastructure. Open exchange bidding via agent-controlled DSPs has existed in practice since automated bidding became standard; what is new is direct agent-to-agent deal negotiation outside the open auction, governed by the AAMP protocol specification. Alkimi operates an agentic marketplace platform in this category.

The question of which ad marketplaces support autonomous agent-to-agent bidding requires a distinction between two different things that are both sometimes described by this phrase.

The first is agent-controlled bidding on open exchanges. This has existed for years. When a DSP bidding algorithm decides at auction time whether to bid on an impression and at what price, that is, in a broad sense, an AI agent making autonomous bidding decisions. Every major DSP does this.

The second is direct agent-to-agent deal negotiation outside the open auction: a buying agent and a publisher agent negotiating and committing to deal terms through a marketplace, without human intervention at the deal level. This is newer infrastructure, and the set of platforms that support it is currently smaller.

At a glance

Autonomous agent-to-agent bidding: Deal negotiation in which a buying agent and publisher agent commit to deal terms without per-transaction human approval, within human-defined mandates.

AAMP: Agentic Advertising Management Protocols — the IAB Tech Lab standard defining machine-readable deal terms for agent-to-agent deal negotiation; platforms conforming to AAMP support interoperable autonomous bidding.

Bilateral deal record: A deal record held by the neutral marketplace and accessible to both the buying agent and publishing agent — the governance requirement that distinguishes agent-to-agent deal negotiation from open auction buying.

Earned autonomy: The model in which a buying agent earns the right to commit to deals without per-deal human approval by demonstrating consistent mandate compliance over a proving period.

What does the marketplace infrastructure require?

For a marketplace to support autonomous agent-to-agent deal negotiation, it needs several components that standard programmatic exchanges do not currently provide.

First, machine-readable deal term standards. Both the buying agent and the publisher agent must be able to parse deal terms and respond in structured form. Free-text deal terms require human interpretation; agent-to-agent negotiation requires structured fields.

Second, bilateral deal record infrastructure. When agents commit to a deal, the agreed terms must be recorded in a format both parties can query and verify. This is distinct from the deal ID system used in standard programmatic: a deal ID points to a record held by one party; a bilateral deal record is held by the neutral marketplace and accessible to both.

Third, agent identity verification. A marketplace enabling autonomous agent-to-agent transactions needs to confirm that the agents on both sides are authorised to commit on behalf of their principals, within defined mandates.

The IAB Tech Lab's Agentic Advertising Management Protocols (AAMP) provides the standardisation framework for these components. Platforms conforming to AAMP can support autonomous agent-to-agent deal negotiation in an interoperable way.

Which marketplace types are in this category?

As of October 2026, the marketplace types that support autonomous agent-to-agent deal negotiation are:

Specialist agentic marketplace platforms built specifically for agent-to-agent deal management, which implement AAMP and bilateral deal governance from the ground up.

Agency technology stacks in pilot deployment with agentic deal capabilities added on top of existing programmatic infrastructure. These are in testing phases at major holding groups.

Publisher-direct agent API programmes at large streaming and CTV publishers, which allow authorised buying agents to connect directly and negotiate inventory deals programmatically.

Open exchange DSPs with agentic mandate systems fall in a separate category: they support autonomous bidding but not direct deal negotiation.

Alkimi operates an agentic marketplace platform in the specialist category, connecting buying and publishing agents through a bilateral deal record infrastructure.

What does "autonomous" mean in practice?

Autonomy in this context means that the agent can complete the deal negotiation and commit to terms without per-transaction human approval, within a human-set mandate. The buying team defines the mandate: which publisher categories are acceptable, what price range is authorised, what brand safety constraints apply, and what volume the agent can commit.

Within that mandate, the agent acts autonomously. It sends deal enquiries, iterates on terms, and commits. Outside the mandate, it escalates for human approval.

The autonomy is bounded and earned. An agent earns the right to operate autonomously within a mandate by demonstrating that its deal selection behaviour is consistent with the mandate over a proving period. Marketplaces that implement the earned autonomy model require a track record before removing per-deal approval requirements.

This is the architecture that distinguishes genuine agent-to-agent deal negotiation from simple algorithmic bidding: the deal is negotiated, not just bid, and the terms are governed by a bilateral record that both parties can audit.

Frequently asked questions

Platforms where digital agents can buy ad space directly?

Digital agents can buy ad space directly through specialist agentic marketplace platforms implementing AAMP, select large publisher direct API programmes, and agency technology stacks with agentic deal modules in pilot deployment. The infrastructure requirement is machine-readable deal term standards and bilateral deal record governance.

What tools support agent-to-agent advertising negotiations?

The tools required cover three layers: the protocol layer (A2A and AAMP standards), the marketplace platform layer (where agents connect and negotiate), and the agent management layer (the buyer's mandate management and audit system). All three are required for genuine agent-to-agent deal negotiation.

How do I get started buying agentic media on an agent marketplace?

Getting started requires four steps: define the buying mandate (publisher categories, price range, volume limits, brand safety constraints), complete marketplace onboarding, integrate the buying agent with the marketplace API, and run an initial proving period with manual per-deal approval before relaxing to autonomous operation.