Digital media buying agencies, compared on disclosure

Agencies with a verified published price

What gets recorded, and how

1. Fee model, stated in its own shape. A share of spend, a flat retainer and an hourly rate are not comparable numbers, so each is recorded as published rather than converted into a single figure. Where a firm publishes nothing, the entry says nothing rather than estimating.
2. Minimum managed spend. Most buying shops have a floor below which the engagement does not pay for itself, and many state it. That floor removes more candidates from a shortlist in one pass than any other single disclosure, so it is recorded separately from any starting fee.
3. Channels run in house. Search, paid social, programmatic display, retail media and connected television are different disciplines with different buying desks. Where a firm says which it runs itself and which it places through a partner, that is recorded, because it changes both cost and accountability.
4. Named clients and live examples. Only clients a firm names in public count toward its disclosure. An anonymised case study describing a national retailer proves nothing a buyer can verify, so it is treated as marketing rather than as evidence.

The three fee models and what each one does to behaviour

A share of media spend is the oldest model and the easiest to administer. Its weakness is obvious: the agency's revenue rises with your budget regardless of whether the extra budget performed. It suits buyers with a large, stable spend and a strong internal analyst, and it suits it least when nobody in house is checking the marginal return of the last increment.

A flat retainer removes that pull and introduces a different one, since scaling a winning campaign creates work without creating revenue for the agency. Performance based fees tied to acquisitions or revenue sound like the resolution and usually relocate the argument to attribution. Whichever you choose, insist that media spend and agency fee are separate lines on the invoice, and that any rebate or platform incentive the agency receives is disclosed.

Account ownership, the clause worth reading twice

Ad accounts, pixels, conversion tags, audience lists and the historical data inside them should belong to the advertiser. When an agency buys through its own accounts, everything learned during the engagement, including the audiences your money trained, leaves with the agency when the relationship ends. Some firms have a legitimate operational reason for buying centrally, and the point is not that it is disqualifying, it is that it should be disclosed and priced.

Ask three questions before signing: whose accounts hold the campaigns, what exactly transfers on termination, and how much notice a handover needs. Get the answers into the contract rather than into an email. This is not a hypothetical concern, it is the most common reason a switch of agency costs a quarter of lost performance.

Judging the work rather than the dashboard

Platform dashboards report the metrics platforms like to be judged on, and a report assembled from them will show impressions, clicks and a platform attributed conversion count that overlaps with every other platform in the mix. Ask instead for a view that starts at total spend and ends at orders or qualified enquiries recorded in your own system, with the platform figures shown alongside rather than in place of it.

Ask what they changed last month and why, and listen for whether the answer describes decisions or activity. Creative rotation, audience pruning and budget reallocation are decisions. Reporting cadence and campaign counts are activity. Both go on invoices, but only the first is what a buying agency is actually for.

Questions people actually ask

What is a reasonable fee as a share of spend?

It varies with spend size and channel complexity, and any single number quoted as an industry standard is doing more marketing than reporting. What matters more than the rate is whether it is disclosed, whether it changes at higher spend tiers, and whether platform rebates flow to you or stay with the agency. Ask all three and compare answers rather than headline rates.

Should we hire separate specialists per channel?

If spend in each channel is large enough to justify a dedicated team, often yes. Below that, coordination cost usually eats the specialist advantage, because someone has to reconcile conflicting attribution and decide the split. A single firm that is honest about which channels it is strong in beats a set of specialists nobody is coordinating.

Can an agency guarantee a cost per acquisition?

Some will, and the guarantee is normally hedged by conditions on creative, landing pages and minimum spend that make it hard to invoke. Treat it as a signal about sales style. A firm that instead tells you what it does not yet know, and what the first month of spend is buying in the way of information, is usually the more competent one.

How long before performance stabilises?

Expect several weeks of deliberately noisy learning while campaigns gather data, then a clearer picture. Judging a new account in week two is judging the learning phase. Agree in advance what the first month is meant to establish, and set the real review point where the data can actually support a decision.

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