How do you choose an Amazon ads agency?

The most common mistake in hiring an Amazon ads agency is treating it as a Meta or Google extension. The mechanics look similar. Auctions, keywords, dashboards. But the economics and operating model are different in ways that make most general paid-media agencies underperform on retail media. Amazon performance is bottlenecked by listing quality, review velocity, inventory position, and Buy Box ownership long before it's bottlenecked by bid strategy. A great Amazon agency spends as much time on the catalog and operations side as on the media side.

Retail media has also fragmented past Amazon. Walmart Connect, Instacart Ads, Kroger Precision Marketing, Target Roundel, and the on-site networks of every major retailer are now real budgets, with different APIs, different attribution windows, and different bidding mechanics. An agency that's deep on Amazon but treats Walmart as an afterthought will leave significant share-of-voice on the table.

Amazon Ads Verified Partner status is the table-stakes credential. Beyond it, look for Advanced or Premier tier, which require demonstrated spend management and revenue thresholds. Certification is necessary but not sufficient. Many certified agencies are mediocre operators that hit the volume requirements.

Category specialization is the more reliable signal. The playbooks for CPG consumables (subscribe-and-save, replenishment dynamics, share-of-shelf), durables (long consideration cycle, review-driven), and apparel (variation parents, return rates, seasonality) are genuinely different. Ask for case studies in your specific category, and weight category-matched references at least 3x more heavily than generic ones.

Amazon Marketing Cloud (AMC) and the Amazon DSP have unlocked incrementality measurement that most agencies still don't use. Strong partners run AMC-based holdout tests, brand-halo analyses (sponsored ad impact on organic sales), and new-to-brand cohort tracking. Weak partners optimize ACoS and call it a day.

Outside Amazon, the measurement story is messier. Walmart Luminate, Kroger 84.51°, and Circana clean-room work require dedicated teams and budget. If you're a national CPG brand spending across multiple retailers, ask explicitly about clean-room access and the agency's analyst bench. This is increasingly the dividing line between modern retail media partners and traditional Amazon-only shops.

An Amazon agency that only manages bids will see compounding underperformance because the listing and content side compounds the wrong way over time. A+ content, brand store quality, image stack, review acquisition cadence, and inventory health all feed conversion rate and organic ranking. The best agencies either own these workstreams or have a clean handoff with a partner that does.

Ask any Amazon agency to walk through how they coordinate with your operations team on inventory forecasting and out-of-stock recovery. The agencies that have a documented process here are the agencies that survive Q4 inventory crunches without burning your ad budget on suppressed listings.