A digital media agency plans and buys paid attention: search ads, social ads, display, video, audio and whatever new inventory arrives next quarter. The label is loose enough that two agencies using it can be selling completely different things, one a media buying desk with a trading relationship, the other a full-service marketing team that happens to run some ads. Since you are handing over a budget to be spent on your behalf, the contract terms matter as much as the campaign craft. This page defines the category, separates it from adjacent ones, and sets out the disclosures a buyer is entitled to.
What the category actually covers
Media work splits into three jobs that are often sold as one. Planning decides which channels and audiences get the money and why, and produces the media plan you are approving. Buying executes it inside auctions and direct deals, which for search and most social means managing bids, budgets, audiences and creative rotation day to day. Measurement decides what counted, which is where most disputes start, because a platform reporting its own conversions is grading its own work. A digital media agency should be explicit about which of the three it does, which it subcontracts, and which it expects you to own. Creative production, brand strategy and search engine optimisation are adjacent purchases; some digital media agencies include them, many do not, and a proposal that mentions all of them without naming who does the work is a reseller arrangement you have not been told about.
The disclosures you are entitled to
Google publishes an advertiser guide for working with third parties that sets a useful floor for any media relationship. The third-party agency must set up a separate ads account to represent you fairly. At a minimum you have the right to know the number of clicks, impressions and the total cost of your ads. Third-party partners will often charge a fee in addition to the cost of advertising, and Google's guidance stresses understanding the total cost of advertising including any fee your partner charges. It also advises staying informed and involved and evaluating performance regularly against what you are investing. Translate that into contract terms: accounts in your name, platform costs reported separately from agency fees, and access to the raw platform reporting rather than only a slide. If an agency resists any of those three, the resistance is the information.
How agencies charge, and why it changes behaviour
Three models dominate and each bends incentives differently. A percentage of media spend is simple and scales with budget, which quietly rewards spending more rather than spending better. A flat retainer is predictable and rewards efficiency, but can leave a small account under-serviced when a big one gets busy. Performance-based fees align spending with outcomes on paper, but only work when the outcome is measured by something the agency cannot influence directly, which in practice is rare. None is wrong; what matters is that you can see the fee. Ask for the fee stated as a number rather than a percentage of a number you do not yet know, and ask what happens to the fee when spend pauses. Ask also whether the agency receives any rebate, incentive or preferential rate from a platform or reseller, and get the answer in writing.
Vetting a digital media agency
Ask for a client whose account structure you can see, not just a results slide, and ask what the agency inherited versus what it built. Ask which conversions it counts, how they are defined and whether it reports platform-attributed and independently measured numbers side by side. If influencer or creator media is in the plan, the Federal Trade Commission's endorsement guidance applies: where a connection between an endorser and a marketer would not be expected by a significant minority of consumers and would affect how they evaluate the endorsement, that connection must be disclosed clearly and conspicuously. Ask who is responsible for enforcing those disclosures, because the advertiser carries the exposure. Finally, ask what the offboarding looks like: account ownership, historical data, pixel and tag ownership, and creative files. A confident agency has an answer ready.
Questions people ask about digital media agency
What is the difference between a digital media agency and a marketing agency?
A digital media agency plans, buys and measures paid inventory. A full-service marketing agency may add brand strategy, creative production, search optimisation and content. Ask which functions are done in house and which are subcontracted, because the label alone does not tell you.
Should my ad accounts be in my name?
Yes. Google's advertiser guide states that a third-party agency must set up a separate ads account to represent you fairly. Agree ownership and admin access before the first spend so the account, its history and its conversion data remain yours when the relationship ends.
What reporting should a digital media agency provide?
At a minimum, Google's guidance says you have the right to know clicks, impressions and the total cost of your ads, with the agency's fee visible separately from media cost. Ask for access to the platform reporting itself rather than only a summary deck.
Who is responsible for influencer disclosures?
The advertiser carries the exposure, so make responsibility explicit in the contract. FTC guidance requires clear and conspicuous disclosure of connections between endorser and marketer that consumers would not expect and that would affect how they weigh the endorsement.