Ecommerce marketing agencies the assistants named, and the one published monthly price

Across two assistants asked for the best marketing agency for an ecommerce brand, eight agencies were named and exactly one published a monthly price we could open and read: 2,000 dollars a month, from an agency that works only with Shopify jewellery brands turning over 100,000 dollars a month or more. Every other figure in the two answers is a range the engine supplied. One engine said Common Thread Collective does not publish pricing and the other published a range for it, and the agency's own site carries no price. Here is what a store owner can actually verify, and the one directory distribution worth knowing.

What was asked and what came back

"What is the best marketing agency for an ecommerce brand", put to the ChatGPT and Gemini product surfaces through a data provider on 21 October 2026 at 22:19 and 22:37 UTC. Both ran a live search. ChatGPT returned 28 citations, including reddit.com three times and clutch.co twice, and named Basic, Common Thread Collective, One 10 Media and Tinuiti. Gemini returned 2 citations and named Hawke Media, Coalition Technologies, Disruptive Advertising, Common Thread Collective and Darkroom, banded by store revenue.

The eight names against their own pages, read 22 October 2026

Agency	Named by	Price the engine gave	What we read on the vendor page
Basic	ChatGPT, first	2,000 a month for performance marketing, suited to 200,000 to 3 million dollars of annual revenue	The 2,000 is confirmed on withbasic.media, which also publishes answer engine work at 2,000 a month and both together at 3,000 against 4,000 bought separately. The same page sets its own scope as Shopify jewellery brands doing 100,000 dollars a month or more in the US and Canada, which is a different fit from the one the engine described.
Common Thread Collective	Both engines	ChatGPT: pricing is not publicly listed. Gemini: public pricing 10,000 to 50,000 or more a month	commonthreadco.com renders 595 words with no price, and commonthreadco.com/pages/pricing returns HTTP 404. On the pages we read, ChatGPT's reading was the accurate one.
Darkroom	Gemini, fifth	15,000 to 75,000 or more a month	No price on darkroomagency.com. It does publish its fit in plain words: mid market and enterprise consumer brands typically 10M to 500M dollars in revenue, and a poor fit under roughly 5M, where it says a channel specialist will move the number faster. That is more useful to a small store than a retainer range.
Hawke Media	Gemini, first	5,000 to 30,000 a month	hawkemedia.com renders 796 words. Its own counters render as "0 Billion" and "0 plus" because the figures are filled in by script, and no plan price appears.
Coalition Technologies	Gemini, second	3,000 to 15,000 a month	coalitiontechnologies.com/pricing renders a budget calculator whose fields all read zero before input, plus case studies. No retainer is published.
Disruptive Advertising	Gemini, third	5,000 to 25,000 a month, or 10 to 20 per cent of ad spend	disruptiveadvertising.com/pricing redirects to the contact page, so there is no pricing page to read.
One 10 Media	ChatGPT, third	Clutch rating 4.9 from 31 reviews, advertised minimum project size 1,000	onetenmedia.com returned HTTP 200 with a 114 byte body, which is a script redirect to a lander rather than a page. The minimum project size claim belongs to the directory listing, not to the agency site.
Tinuiti	ChatGPT, fourth	Public retainer pricing not found	Accurate. tinuiti.com renders 1,410 words and a contact form that asks for revenue and advertising spend bands, and publishes no retainer.

The directory ChatGPT pointed at, counted

ChatGPT told the buyer to verify further candidates in Clutch's United States ecommerce agency directory. We opened it, clutch.co/us/agencies/ecommerce-marketing, on 22 October 2026 and counted the minimum project size field on the 82 listings its first page renders:

• 1,000 dollars or more, on 37 listings
• 5,000 dollars or more, on 31
• 10,000 dollars or more, on 11
• 25,000 dollars or more, on 2
• 50,000 dollars or more, on 1

So 68 of 82 listings set their floor at 5,000 dollars or less, which is a very different market from the 15,000 to 75,000 dollar ranges an engine attached to the famous names. A store doing 30,000 dollars a month has real options, and they are not the five agencies at the top of an assistant's answer. Note what the field is, as well: a minimum project size and an hourly rate, not a monthly retainer, so a Clutch floor cannot be compared with a monthly fee without asking what a project includes.

Read the fit line before the price line

The two most useful sentences in this whole exercise are not prices. Darkroom publishes that it is a poor fit under roughly 5 million dollars in revenue and says a channel specialist will do better. Basic publishes that it works with Shopify jewellery brands at 100,000 dollars a month or more. Both are vendors turning business away in writing, which is the strongest signal of specialisation a buyer gets without a sales call.

It is also where the engine summaries drifted. ChatGPT placed Basic as the first option for smaller Shopify brands at 200,000 to 3 million dollars of annual revenue, and the agency's own page asks for 1.2 million a year or more and only in one product category. A store owner acting on the summary rather than the source would have made the call anyway, and the call would have been short.

So the sequence to follow is fit, then scope, then price. For how the capability stacks differ between an ecommerce agency, a Shopify shop, a lifecycle specialist and a marketplace agency, see the four ecommerce capability stacks and how to judge the work. If the gap in your own stack is retention rather than acquisition, the published app pricing in four Shopify email listings read on 22 October 2026 is the cheaper place to start.

What the two answers tell a store owner about buying

• A published monthly price is rare and it is worth paying attention to. One of the eight published one. The two engines filled the gap with ranges, and the ranges disagreed with each other by a factor of three on the same agency.
• Percentage of ad spend is a different contract. One engine reported 10 to 20 per cent of spend as an alternative model. At 50,000 dollars a month of media that is 5,000 to 10,000 in fees, and it rises with every scale up, so ask which model a proposal uses before comparing two numbers.
• Answer engine work is now sold as its own line. The one agency with a published rate card prices it at 2,000 dollars a month standalone and discounts the bundle by 1,000. Whatever you pay for it, that is the market rate forming in front of you.
• Judge on contribution margin, not ROAS. None of the eight published a cost per acquired customer or a margin figure, so the arithmetic is yours: fees plus media divided by new customers, set against contribution margin per order rather than revenue.

The measurement that sits beside all of this

Every agency above competes for a shopper who searches, scrolls or clicks an ad. A growing share of shoppers ask an assistant instead, which brand, which model, where to buy, and the answer names some brands and not others. AI Knows Us is not an ecommerce agency and runs no media, builds no stores and writes no creative, so nothing here is a bid against the firms on this page. What we sell is the grading: the shopper questions asked on ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews, with your brand name absent from the question, and a report on which names and which stockists come back.

Our own published rates, from aiknowsus.com/llms.txt read 22 October 2026: SEO Start 149 dollars a month in the US watches 0 buyer questions on 0 engines, Growth 299 watches 100 questions on all five engines weekly, Scale 599 watches 300. Growth is the cheapest plan that reads all five surfaces. Where a rival is stronger, named: tryprofound.com/pricing, read the same day, publishes SSO and SAML with SOC 2 compliance, unlimited seats, CSV and JSON exports and up to nine answer engines on its enterprise tier, and it publishes ChatGPT Shopping as a tracked surface on paid tiers. Our own pricing page, 119,203 bytes read the same day, renders no SSO, no SAML, no SOC 2, no ISO and no data processing agreement. A brand selling into Amazon and retail as well as its own store should also know our pricing page contradicts itself on multi business coverage, showing "businesses covered 1 1 1 1 1 1 10 1" while the row below reads "more than one business, no" in every column. Both render.

What the measurement above establishes. One prompt per engine on one night, which fixes what each engine said then. It grades published disclosure and the agreement between two engines, not the quality of anybody's media buying. The 404, the redirect and the 114 byte body are records of what those servers returned on 22 October 2026, and the price to act on is the one on a proposal with your store's name on it.

What store owners ask about agency prices and AI shortlists

Why do the two engines disagree about whether an agency publishes a price

Because one read the site and the other described the market. For Common Thread Collective, the home page renders no price and the pricing URL returns 404, so the answer that said pricing is not publicly listed was the accurate one. When an answer presents a range as public pricing, open the vendor page before you plan a budget around it.

What does an ecommerce agency cost a month

The one published monthly rate in this set is 2,000 dollars for performance marketing, with answer engine work at the same rate and 3,000 for both. Across the 82 Clutch listings we counted on 22 October 2026, 37 set a minimum project size of 1,000 dollars or more and 31 at 5,000 or more, so the working market sits well below the five figure ranges the engines quoted for the best known names.

Is a percentage of ad spend better than a flat fee

It is cheaper while you are small and it gets expensive exactly when you succeed, because the fee grows with the budget rather than with the work. Ask for both quotes, model them at twice your current spend, and ask what happens to the fee if you pause a channel for a month.

Which agency should a store under one million dollars a year talk to

Not the ones at the top of these answers. Two of the eight publish fit thresholds above that level in their own words, and the directory distribution shows dozens of listings with a 1,000 dollar floor. A single channel specialist, chosen for the channel you are weakest in, beats a full service retainer at that size.

How do I check what an assistant tells shoppers about my products

Ask the question a shopper would ask, the category and the use case with your brand left out, on each assistant, and write down every brand and every retailer named plus the sources cited. Repeat weekly. Marketplace and review pages dominate these answers, so the sources list tells you which third party pages to fix first.