How to choose an ecommerce performance marketing agency
Evaluate the plan connecting paid social, paid search and AI discovery to your store’s economics.
Morpheus Media provides paid media and AI search services. This guide presents our editorial evaluation framework so you can compare us and other partners.
The short answer
Choose an ecommerce performance marketing agency that can explain how each channel contributes to a shared business goal, show the assumptions behind its budget, and report contribution after marketing costs alongside customer growth. Ask who owns the forecast, how the team resolves conflicting platform reports, and what evidence would cause it to reduce spend.
A broader service list is useful only when the team can coordinate the work. A Shopify brand may need stronger creative, better product feeds, clearer measurement or a more effective landing page before it needs another channel.
1. Start with the business constraint
Write a short brief before asking for proposals. Include your product range, net sales, contribution margin, new-customer mix, current media spend, stock availability and internal team capacity. Identify the decision you need help making: acquiring customers economically, improving conversion, expanding demand or allocating a fixed budget.
Ask each agency to distinguish its responsibilities from yours. Media management, creative production, product-feed maintenance, landing-page changes and retention work require different skills. Clarify what is included, what is a recommendation for your team, and what requires a separate scope.
One coordinated partner or channel specialists?
A coordinated partner can suit a brand that needs one budget owner and connected creative, media and reporting decisions. Specialists can work well when an internal lead can reconcile their plans and prevent overlapping claims. Compare the actual team, decision rights and deliverables. Neither model guarantees better performance.
If your immediate need is Meta alone, use our Shopify Meta Ads agency buyer guide for a more detailed creative and agency-fee checklist.
2. Require a distinct job for each channel
A useful proposal explains the customer problem each channel addresses, its dependencies and the evidence needed to change its budget. Ask for this plan before accepting a fixed percentage split.
Paid social: creative, demand and learning
Ask how the team will develop concepts from customer research, produce the assets and turn results into the next brief. Separate new-customer acquisition from returning-customer activity in the review. Agree on creative ownership, usage rights and production capacity.
Paid search: intent, product data and coverage
Ask how the agency will distinguish branded demand from nonbrand acquisition and evaluate Search and Shopping activity. Request a product-feed review and a plan for unavailable products, margin differences and landing-page relevance. A strong aggregate ROAS should lead to questions about customer mix and demand that already existed.
AI search and GEO: discoverability and evidence
Ask which buyer questions your content should answer, what evidence supports those answers, and how the team will measure mentions, citations, referrals and enquiries separately. A citation is not a sale, and a missing referrer does not establish that a visit came from AI.
Google says its existing SEO fundamentals remain relevant to AI Overviews and AI Mode, with no additional technical requirements for appearing in those features. Use that guidance to challenge proposals built around a supposed mandatory AI shortcut. Read Google’s guidance on AI features.
Expansion channels: justify the next test
If an agency proposes performance TV, another social network or a new market, ask what makes that test appropriate now. Require a creative plan, a measurement approach, a budget limit and a decision date. Confirm whether the agency delivers that work itself or uses a specialist partner.
A budget decision to request
“If we keep the total budget unchanged, where would you move the next dollar, which assumption supports that move, and what would make you reverse it?” A useful answer addresses marginal opportunity, uncertainty and operating capacity rather than repeating last month’s channel mix.
3. Ask for a forecast you can inspect
Request a model that starts with your business inputs and connects spend to new customers, repeat purchases and contribution. It should identify which inputs are observed, which are assumptions and who updates them. Include promotions, inventory constraints and seasonal effects.
Agree on a net-sales definition, then subtract product costs, variable fulfillment and payment costs, media spend, agency fees and creative costs. State which costs are excluded. Contribution after marketing is useful for a growth decision, but it is not the same as company net profit.
An illustrative comparison
Suppose a store has $100,000 in net sales and a 45% contribution margin before marketing. That leaves $45,000. With $25,000 in media and $5,000 in agency and creative costs, contribution after marketing is $15,000.
A proposed expansion might produce $120,000 in net sales at the same margin, with $35,000 in media and $7,000 in fees and creative. That leaves $12,000. Sales increased while contribution after marketing fell by $3,000. These are hypothetical figures, not Morpheus pricing or a forecast for your store.
Ask the agency to model a downside case and explain the cash implications. If repeat purchases justify a higher acquisition cost, request actual cohorts, a payback period and sensitivity to weaker retention. Define the conditions under which the team would hold, reduce or increase spend.
4. Make the reporting agree on the decision
Use platform reports for campaign diagnosis and store-level economics for the overall business review. Do not add the sales claimed by different advertising platforms and assume the sum represents unique revenue. Agree on the reporting period, attribution settings, treatment of returns and definition of a new customer.
Shopify offers marketing reports with different attribution models, which assign conversion credit differently. Ask the agency to explain those differences before it uses them to justify a budget change. Read Shopify’s marketing-report documentation.
- Business view: net sales, new customers, total marketing costs, contribution and stock or cash constraints.
- Channel view: spend, attributed outcomes, creative or query learning and the next action.
- Forecast view: actual results against assumptions, with the reason for material differences.
- AI discovery view: consistent buyer prompts, brand mentions, owned-page citations, observable referrals and qualified enquiries.
Attribution assigns credit; it does not by itself establish causation. Where scale and data allow, ask how an experiment could test incremental impact. For smaller accounts, require clear limitations and disciplined comparisons rather than a claim of certainty.
5. Inspect the evidence and the working relationship
Ask for a relevant engagement with the starting point, timeframe, scope, costs and metric definitions. A comparable margin profile or operating constraint can be more informative than a familiar logo. Find out what the agency changed and what the client changed at the same time.
A Morpheus example: Paula’s Choice
Our Paula’s Choice case study describes Google Ads and Meta Ads work, account consolidation and reporting across ad accounts, attribution models and projections. Use it to discuss how we approach coordination and budget decisions. Its outcomes are specific to that engagement and are not a promise for another store.
Read the Paula’s Choice consolidation case study
Before signing, document who owns the ad accounts, analytics, product feeds, creative files and reporting access. Confirm the team doing the work, approval responsibilities, extra charges, notice period and handoff requirements. Keep management fees, media budgets and production costs distinct in the proposal.
6. Agree on a first-90-days review plan
Days 1–30: establish the shared baseline
Confirm access, review tracking, reconcile store and platform reporting, document economics and assess creative and feed quality. Agree on channel roles, forecast assumptions and the first tests. Resolve measurement problems before using their output to justify expansion.
Days 31–60: test the plan
Run the agreed tests and review actuals against the forecast. Record what changed, what was learned and why the next budget decision follows. Review product availability and cash constraints alongside campaign results.
Days 61–90: evaluate scope and economics
Compare delivery with the contract and results with the baseline. Assess contribution after all agreed marketing costs, customer acquisition and the quality of the learning. Decide what to continue, change or stop. This schedule is an evaluation framework, not a guaranteed time to profitability.
Questions to bring to your shortlist
- What business constraint would you investigate first?
- Who owns the combined Google and Meta budget decision?
- What costs and assumptions are in your forecast?
- How will you reconcile platform-attributed sales with store results?
- What would trigger a reduction in spend?
- What does AI search success mean beyond mentions?
- Which deliverables, assets and reporting access remain with us?
Should we hire a single agency for Google and Meta?
That can help when you need coordinated decisions and one reporting owner. Separate specialists can also work if someone internally owns the combined forecast and resolves conflicts. Evaluate the proposed people and operating process.
Should we add AI search before paid media is profitable?
Assess it as a separate scope with its own cost, evidence and review horizon. Improving useful service and product information may support discovery, but it does not repair weak acquisition economics. Ask the team to prioritize the constraint affecting your business now.
Where can I see Morpheus Media’s pricing?
Review our current packages, then discuss the work your store needs. Confirm the channel mix, creative responsibilities and any additional scope before comparing proposals.
YOUR NEXT STEP
Bring your channel plan into one conversation.
Share your store, current channels and the decision you need help making. We can discuss where paid media, measurement and AI search fit your next stage of growth.
Discuss your ecommerce growth plan