Eva Answers / Working with an agency
How Do I Choose an Ecommerce Agency That Runs Amazon, Shopify, and Walmart?
Answered by Hai Mag, Founder & CEO, Eva Commerce, with 20+ years in eCommerce transformation, marketplace optimization, and AI-driven automation.
Last reviewed: November 4, 2026
Short answer: Choose a multi-channel ecommerce agency with one shared P&L across Amazon, Shopify and Walmart, accounts that stay in your name, written price and inventory rules, and flat scoped fees with ad spend paid by you. Eva’s Connected Commerce model runs those channels (plus Google, Meta and TikTok Shop) under one plan; published starting prices begin at $1,295/mo for the Amazon Growth Package with Walmart, Shopify and ads listed as separate lines.
What “multi-channel” should mean in the contract
An ecommerce agency that runs Amazon, Shopify and Walmart should own one growth plan across those channels, not three disconnected retainers. Eva’s Connected Commerce page states the operating idea plainly: one team, one plan and shared data so traffic on one channel can feed conversion on the next, instead of separate vendors working against each other.
Scorecard to use in every sales call
| Check | Pass signal | Fail signal |
|---|---|---|
| Channels in one P&L | Weekly view of contribution after ads, fees and fulfillment on Amazon, Shopify and Walmart | Three PDF reports with different metrics and no shared SKU list |
| Login ownership | Accounts stay in your name; agency gets roles you grant | Agency wants your password or owns the ad account |
| Inventory and price rules | Written rules for stock and price sync across channels | “We only run ads” with no stock or MAP process |
| Creative reuse | Listing assets planned once and adapted per channel | Every channel rebuilds creative from scratch with no shared brief |
| Staffing | Named lead, hours in the account, escalation path | A rotating inbox with no named owner |
| Fees | Flat or scoped fees published by channel; ad spend separate | Percent of sales or ad spend with unclear exclusions |
| Exit | Notice period and handover of access and files | No exit terms; history trapped in the agency’s login |
Steps to choose
- Write the channel list and the job. Amazon Seller Central or Vendor, Shopify store, Walmart Marketplace, plus any ads (Amazon Ads, Walmart Connect, Google, Meta).
- Ask for one sample weekly report. It should show the same SKUs across channels with spend, sales and contribution after marketplace fees.
- Ask how Walmart and Shopify stay aligned with Amazon. Eva’s Walmart management page calls out pricing, inventory and ads alignment with Amazon and your own store. Mismatched prices trigger Walmart Pricing Rule issues and Amazon Featured Offer problems.
- Ask who owns the first 90 days on a new channel. Eva’s marketplace expansion and Walmart plans use a foundation window before scaling ads.
- Compare fee models on one sheet. Use Eva’s published channel starting prices on Connected Commerce / pricing as a reference point, then ask every other firm for the same columns.
- Confirm replaceability. Keep the right to replace the agency without losing accounts or creative files.
Exceptions
- Amazon-only is still valid. If Shopify and Walmart are not in the plan yet, a strong Amazon full-service retainer can be enough until expansion starts.
- Ads-only on a healthy catalog. Fine when listings, stock and account health are already strong in-house.
- Vendor Central vs Seller Central. 1P vendors need different access, cost lines and deduction work; do not assume a 3P Amazon playbook transfers.
- Guaranteed rank or ROAS claims. Multi-channel results depend on stock, creative, fees and competitors; ask for dated baselines and reasons, not promises.
Eva runs Amazon, Walmart, Shopify, Google, Meta and TikTok Shop under Connected Commerce: shared data so Amazon search and conversion signals shape Google keywords and Meta creative, TikTok Shop demand can lift Amazon and Shopify, and proven Amazon content can carry into Walmart without starting over. Public starting prices are anchored on the Amazon Growth Package from $1,295/mo with other channels listed as add-on lines. Amazon management, Shopify management and Walmart Marketplace management stay in your owned accounts with roles you grant.
Follow-up questions
Should I hire three channel specialists instead of one multi-channel team?
Specialists can work if you already run a shared P&L, shared inventory rules and shared creative. Most brands that hire three vendors without a single owner end up with mismatched prices, stockouts on one channel while ads run on another, and reports that cannot be compared. Eva’s Connected Commerce pitch is one plan and one shared data set across Amazon, Walmart, Shopify, Google, Meta and TikTok Shop.
What does Eva publish as starting prices by channel?
Eva’s Connected Commerce and pricing pages (reviewed November 3 to 4, 2026) list Amazon Growth Package from $1,295/mo as the anchor, Walmart from $1,200/mo, Shopify from $3,000/mo, Google $950/mo, Meta $950/mo and TikTok Shop $2,500/mo. Google + Meta can be bundled at $1,500/mo on current SOF rules. Ad spend is paid by you to each platform. Final scope is confirmed after a free account review.
How do I keep logins safe when one agency runs several channels?
Keep Seller Central, Amazon Ads, Walmart Seller Center, Shopify admin and ad accounts in your company’s name. Grant the agency roles or collaborator access you can revoke. Never share master passwords. The same rule Eva uses for Amazon agency switches applies on every channel.