Here are top-rated eCommerce advertising (performance + paid media) agencies you can consider — each with the core strengths and the types of brands they typically work with. I’ve included reputable sources for each recommendation.

Top eCommerce advertising agencies (strong performers in paid media, marketplaces, retail media, social & creative)

• Tinuiti — Large independent performance agency; deep expertise in Google/Meta shopping, Amazon & marketplace advertising, retail media and full-funnel performance. Good for brands that need scale and multi-channel ad ops. (Tinuiti.com)
• Wpromote — Full-service digital performance agency well known for paid search, paid social, and holistic eCommerce strategies; recognized in industry awards for performance marketing. Good for DTC and mid‑market/enterprise retailers. (Wpromote.com)
• Power Digital Marketing — Omnichannel ecommerce growth partner (paid media + in-house creative + lifecycle/email/SMS). Strong for brands that need acquisition + retention across channels. (cmointern.com)
• Coalition Technologies — Known for technical SEO plus paid search and Shopify development — good when organic + paid need to be tightly integrated. (cmointern.com)
• NoGood — Creative-first performance agency with strong TikTok/paid social and viral launch experience for DTC brands. Good for fast-growth, product-driven launches. (cmointern.com)
• Moburst / Moburst-like mobile-first agencies — Mobile app optimization + social ad creative expertise for brands whose customers are app- or mobile-first. (Example profile: Moburst). (cmointern.com)
• Optimum7 / Optimum7-style full-service Shopify agencies — Combine paid media, SEO, and Shopify engineering for brands needing a single agency for platform and advertising. Good for Shopify stores of all sizes. (Optimum7.com)
• Netalico / Rave Digital / Swanky (Shopify Plus-focused partners) — Top picks for enterprise Shopify Plus builds plus post-launch paid media and CRO. Choose these when you need shop engineering + performance marketing together. (techfelts.com)
• Nuanced Media (Amazon specialists) — If your primary channel is Amazon, use Amazon‑focused agencies that manage Sponsored Ads, storefronts and listing optimization. (cmointern.com)
• Specialist PPC boutiques (e.g., SmartSites, GrowMyAds, other Clutch-ranked PPC shops) — Good for SMBs that want tight ROI-focused Google Ads and shopping campaigns. (LinkedIn.com)

How to pick the right agency (quick checklist)

• Channel fit: Do you need Amazon/marketplace expertise, retail media (Walmart/Target), paid social (TikTok/Meta), or Google Shopping? Pick agencies with proven case studies in your primary channel. (Tinuiti.com)
• Creative + data: For social/video-driven ads (TikTok/Reels) choose agencies that produce in-house creative and run iterative creative testing (NoGood, Wpromote-type teams). (cmointern.com)
• Tech & platform: If you run Shopify Plus or need custom integrations, prefer Shopify Plus partners (Netalico, Rave Digital, Swanky, Optimum7). (techfelts.com)
• Scale & budget: Large agencies (Tinuiti, Wpromote) are optimized for multi-million media budgets and cross‑region expansion; boutiques can be more cost-effective for <$50k/month spend. (Tinuiti.com)
• Measurement & accountability: Ask for ROAS/CAC targets, reporting cadence, and examples of how they tie ad spend to revenue.

Typical initial engagement & price signals

• Discovery + audit (often $2k–$15k) to review accounts and strategy.
• Ongoing management fees: ranges vary widely — 10–20% of media spend, flat retainers $3k–$25k+/month, or performance/bonus structures for enterprise deals. (Get exact pricing during proposals.)
• Creative/production billed separately or bundled depending on the agency.

Next steps I recommend

1. Narrow to 3–5 agencies above that match your primary channel (Shopify, Amazon, TikTok, etc.).
2. Request a recent case study with KPIs for a business similar in size and category to yours.
3. Ask for a proposed pilot (1–3 months) with defined success metrics (Target ROAS, CPA, or CAC).
4. Check verified review sites (Clutch, G2, DesignRush) and request client references.

If you want, tell me:

• your platform (Shopify, Magento, Amazon, etc.),
• monthly ad budget,
• and whether you need creative/production or just media management —

and I’ll shortlist 3 agencies from the list above that best match your needs and budget, and include direct links to their verified reviews and recent case studies.