Published: 17 September 2026

TL;DR: The manipulation vectors that exist in auction-based programmatic do not apply in a bilateral agent-to-agent marketplace. There is no auction, so there is no bid shading, no floor price manipulation, and no bid inflation. The DealSheet records the agreed price, and no intermediary earns a percentage of that price. The protection comes from the structural model: manipulation vectors that depend on auction mechanics simply do not exist in a bilateral negotiation model.

Bid manipulation in conventional programmatic is a well-documented category of problems. Buyers pay above the clearing price because of bid shading arrangements that benefit the SSP rather than the buyer. Floor prices are set in ways that inflate clearing prices without publisher knowledge. Fake bids inflate auctions to push buyers to pay more than they otherwise would. These are not edge cases. They are structural risks that exist wherever auction mechanics and intermediary incentives are misaligned.

Understanding how an agentic marketplace addresses these risks requires understanding which risks are structural and which require active detection.

Why Bid Shading Does Not Apply

Bid shading is a technique where a DSP or SSP reduces a buyer's bid below the submitted bid price, capturing the difference as a form of margin. It exists because in a first-price auction, buyers are incentivised to submit bids below their true valuation, and an intermediary can offer to do this "on their behalf" while retaining some of the saving.

In a bilateral agent-to-agent negotiation, there is no auction. The buy-side agent proposes a price. The sell-side agent accepts, counter-proposes, or declines. The agreed price is written to the DealSheet. There is no bid, no clearing price, and no mechanism through which an intermediary can shade the buyer's position while retaining margin. The concept of bid shading does not apply to bilateral negotiation.

Why Floor Price Manipulation Does Not Apply

In programmatic auctions, floor price manipulation takes several forms. Dynamic floors can be set to maximise the auction clearing price rather than the publisher's true minimum acceptable price. Hidden floors create gaps between the stated floor and the actual floor applied. Both practices disadvantage buyers.

In a bilateral negotiation, the CPM floor is part of the sell-side agent's mandate. The sell-side agent applies the floor its mandate specifies to each incoming proposal. The floor is not a hidden variable controlled by an intermediary. It is a parameter defined by the publisher and enforced by the publisher's own agent.

A neutral marketplace that does not hold or manage floor prices on behalf of either party has no mechanism to manipulate those floors. The publisher's floor is the publisher's parameter. The marketplace does not touch it.

Why Auction Inflation Does Not Apply

Auction inflation through fake bids involves submitting bids into an auction with no intention of winning, with the purpose of pushing the clearing price higher. This is a manipulation technique that requires an auction to function.

Bilateral negotiation does not have an auction. The buy-side agent submits a proposal. The sell-side agent responds. There is no pool of competing bids into which fake bids could be inserted to inflate the outcome. The negotiation is a direct exchange between two agents, mediated by a protocol, with no pool of third-party bids.

What Alkimi Does Not Have a Financial Interest In

A neutral agentic marketplace earns a fixed fee per deal, not a percentage of deal value. This is a structural property with a specific consequence: the marketplace has no financial incentive to influence whether the agreed CPM is higher or lower.

An exchange that earns a percentage of clearing value has an implicit incentive for higher clearing prices, because higher prices mean higher fees. A marketplace that earns a fixed fee per deal has no such incentive. Whether the agreed CPM is £10 or £50, the marketplace's fee is the same.

This does not mean the marketplace actively prevents high CPMs. It means the marketplace has no incentive to push the deal in either direction. The agreed price reflects what the buy-side agent's mandate permitted and what the sell-side agent's mandate required. The marketplace is neutral to the outcome.

What the Structural Model Does Not Address

The protection an agentic marketplace provides against manipulation is structural. It applies to the manipulation vectors that are properties of auction mechanics: bid shading, floor manipulation, and bid inflation. These vectors require an auction to function. A bilateral model removes them by removing the auction.

What the structural model does not address is the quality of the mandates themselves. A buyer who writes a mandate with an excessively high CPM ceiling will pay more than they need to. A publisher who writes a sell-side mandate with excessively low floors will receive less than their inventory is worth. These are mandate calibration problems, not marketplace manipulation problems.

The mandate is the buyer's governance document. The marketplace enforces it. The accuracy of the mandate is the buyer's responsibility. An agentic marketplace provides the structural conditions for fair bilateral negotiation. It does not substitute for well-written mandates on both sides.

Summary

The manipulation risks most discussed in programmatic are properties of auction mechanics and intermediary incentives. A bilateral agent-to-agent marketplace removes auction mechanics and aligns the marketplace's incentives with neutral deal facilitation rather than transaction value maximisation. The protection is structural: the vectors that enable bid shading, floor manipulation, and auction inflation simply do not exist in a bilateral negotiation model. What remains is the buyer's responsibility to write a mandate that reflects their actual commercial requirements.