Marketplace SEO is the work of getting a platform's own pages found in Google and named in AI answers. That covers its categories, supplier and listing pages, comparisons and location pages, for buyers looking for what's listed and sellers looking for somewhere to sell. For a B2B marketplace, it comes down to five decisions:
- Which pages deserve to be indexed, and which should stay out?
- How do filters stay out of Google?
- Can each listing stand alone?
- Do programmatic pages carry real data from your listings, or swapped names?
- Can AI crawlers read and trust you?
A second meaning exists. Some guides on page one use "marketplace SEO" for ranking products inside Amazon or Etsy, which is a seller's problem rather than a platform's. This guide is for the platform.
I'm Brenden House, and I run Searchmaxxed, an SEO and AI SEO agency. On 27 October 2026 (AEST) I read the robots.txt files of five large B2B marketplaces with Firecrawl. What they block is revealing.
In summary
Marketplace SEO is deciding which of your millions of possible URLs deserve to rank, then making those pages the best answer on the web.
| Decision | What winning marketplaces do |
|---|---|
| Which pages to build | Demand pages for buyers and supply pages for sellers, each with real listings behind it |
| Which listings to index | Only listings with unique detail; the rest stay crawlable but noindexed |
| Faceted search | A small set of filter pages indexed; every other combination blocked |
| Programmatic pages | One template, real data per page, published only where listings exist |
| AI answers | Search crawlers allowed in; reviews and facts that AI tools can quote |
- Index control beats volume. Google's spam policies call out "substantially similar pages that are closer to search results than a clearly defined, browseable hierarchy".
- G2, Faire, Capterra, Upwork and Alibaba keep crawlers out of internal search, and Faire stops them after page 11 of a category.
- AI tools lean hard on directories and review platforms, and a B2B marketplace already looks like one.
- Start with the pages buyers search for, add seller pages next, and scale with templates once your data can carry each page.
What is marketplace SEO?
Marketplace SEO is search engine optimisation for a platform that connects buyers and sellers. The platform owns the site, but third parties supply most of what's on it. That split shapes every decision.
Here are the terms you'll meet, in plain words:
- Two-sided marketplace: a platform serving two groups, such as suppliers and procurement teams, or software vendors and the companies buying software.
- Supply side and demand side: sellers are supply. Buyers are demand.
- Listing page: one seller's product, service or profile page, mostly written by the seller.
- Category page: a page grouping listings, like "industrial pressure valves".
- Faceted navigation: the filters on a category page (size, price, certification, region), each of which can create a new URL.
- Indexation: whether a page sits in Google's index.
- Programmatic SEO: many pages from one template and a dataset, such as one page per category in each city.
Each side searches with its own words. A procurement manager types "ISO 9001 machining suppliers"; a machine shop owner types "find manufacturing customers online".
A B2B marketplace adds one more twist. Buyers in procurement, engineering and IT rarely buy on the first visit, because they compare suppliers, read reviews and check certifications, often as a committee. Your pages have to rank. Then they have to survive the checking.
How is marketplace SEO different from ecommerce SEO?
Marketplace SEO differs from ecommerce SEO because you don't write most of your pages and you don't control the stock. Sellers write the listings. Listings come and go daily, and the URL count can run far past anything a store reaches.
| Ecommerce store | B2B marketplace | |
|---|---|---|
| Who writes product pages | Your team | Sellers, at widely varying quality |
| Stock | Yours, fairly stable | Theirs, changing daily |
| Audiences | Buyers | Buyers and sellers, with different searches |
| Page count | Thousands | Often hundreds of thousands to millions |
| Main risk | Duplicate product copy | Thin listings, filter bloat, near-duplicate category pages |
| Trust | Your brand | Your brand plus every seller's reputation |
Google wrote its crawl budget guide mainly for "large sites (1 million+ unique pages)" changing weekly, or sites with "10,000+ unique pages" changing daily. A B2B marketplace with daily listing changes can land in that second group early. Ecommerce rules help. They just won't settle the decisions that matter here.
Which pages should a B2B marketplace build first?
Build demand pages first, because buyers create the searches and the revenue, then supply pages that win sellers. Link the two together. Every page should match a real search.
A demand page answers a buyer's search with real listings: "food-grade stainless steel suppliers", "SOC 2 compliance software" or "hire a Salesforce consultant". A supply page answers a seller's search, like "sell to retailers wholesale" or "list my software on a marketplace". Sellers search too. Most marketplaces give them one sign-up page and nothing else.
| Page type | Side | Example search it answers | Index it? |
|---|---|---|---|
| Category | Demand | "industrial pressure valves" | Yes, when it has enough listings |
| Category plus location | Demand | "packaging suppliers Melbourne" | Yes, only where local listings exist |
| Category plus attribute | Demand | "ISO 9001 certified machining suppliers" | Yes, for attributes people search |
| Comparison | Demand | "Vendor A vs Vendor B" | Yes, for pairs with search demand |
| Supplier or seller profile | Both | "[Supplier name] reviews" | Yes, when it has unique detail |
| Single listing | Demand | A part number or model name | Depends on uniqueness (next section) |
| Seller landing page | Supply | "sell industrial parts online" | Yes |
| Guides and data reports | Both | "how to choose a contract manufacturer" | Yes |
How should a landing page for a two-sided B2B marketplace look? It speaks to one side. A buyer page puts listings, filters, lead times and reviews above the fold. A seller page shows what joining costs, who buys and how fast payouts arrive. Try to serve both and you serve neither.
Our engagements start with this map. We pull your Search Console data, your category tree and the live Google results, then list which page types deserve to exist for each side. We build the pages with listings and demand behind them first. The rest wait.
Should a marketplace index every listing page?
No. Index the listings that carry unique detail a searcher would want, and noindex the rest while keeping them crawlable. A listing that repeats a manufacturer description, with no reviews, photos or specs, adds little Google can't find elsewhere.
Three models work:
- Index everything: this suits one-of-a-kind items, like a used CNC machine with its own serial number, hours and photos.
- Index the categories, noindex the listings: this suits listings that are many and alike, which the category page gathers into something worth ranking.
- Hybrid with a threshold: a listing becomes indexable once it passes your bar, such as a full spec sheet, three verified reviews and original photos.
I'd start most B2B marketplaces on the hybrid. It rewards sellers who put effort in, and it stops one lazy supplier adding 5,000 thin pages overnight.
Two details catch teams out. A noindexed page must not also be blocked in robots.txt, or Google never sees the noindex tag. And expired listings need a clean ending. If the item is gone for good, return a 404 or 410. Otherwise, show a "sold" page linking to the closest match the seller still offers.
How do you stop faceted search from flooding Google?
Index only the few filter combinations that match real searches, and block every other combination from crawling, because the rest is noise. Google's guidance is to disallow unneeded facet URLs in robots.txt or move filters into URL fragments. It calls canonical tags and nofollow "generally less effective in the long term".
The maths explains why. Take an example: an industrial valves category with five filters.
| Filter | Options |
|---|---|
| Material | 8 |
| Size | 12 |
| Pressure rating | 6 |
| Certification | 5 |
| Country of manufacture | 10 |
If each filter can be off or set to one option, that's 9 × 13 × 7 × 6 × 11. My arithmetic puts it at 54,054 URLs for one category, before sort orders and pagination. Across 200 categories, that hands Google more than 10 million filter URLs. Maybe a few hundred match real searches.
Google also asks for a 404 when a filter combination returns nothing, and for filters to sit in one consistent order. Both stop crawlers wasting time on empty and duplicate pages.
What do the big B2B marketplaces block?
They block internal search, sorting, tracking parameters and most filters, then open up only the pages they want ranked. Here's what each robots.txt said on 27 October 2026 (AEST).
| Marketplace | What it keeps crawlers out of | What it opens up |
|---|---|---|
| G2 | Internal search, user-saved comparison reports, seller review and product filters, tracking parameters | Comparison pages, which get their own sitemap index |
| Capterra | Internal search, sort_options, test variants (?exp=, ?variant=), paid landing pages, its "fit finder" | Everything else |
| Upwork | Job search, profile search, a freelancer search facet endpoint, sign-up and contact URLs | Everything else, and it names AI search crawlers as welcome |
| Faire | Filters like brand=, filters=, lead_time and product_attribute, plus pagination past page 11 | Category and supplier list pages 1 to 11 |
| Alibaba | /products/ and /product/ URLs, buyer offers, city pages, country importer lists | Product detail pages and showroom pages |
Faire's rule is the one I'd copy first. It allows page=1 to page=11 on categories and supplier lists and disallows everything deeper. Crawlers still reach old items through sitemaps and links, without paging through thousands of near-identical lists.
G2 is the clever one on comparisons. Its compare pages stay open to Google and get their own sitemap index. User-saved comparison reports stay blocked, and AI training crawlers can't reach three-way comparisons (/compare/-vs--vs-*) at all.
Our faceted navigation SEO guide sets out the robots.txt, canonical and URL rules in full. On a Searchmaxxed engagement we read the crawl, sort facet URLs by real search demand, write the rules and check what Google indexes afterwards.
Can programmatic pages work for a marketplace without becoming spam?
Yes, when each page carries data a searcher can't get elsewhere and exists only where listings back it up. They turn into spam when a template swaps a city or category name into the same empty shell.
Google's spam policies name both risks. Scaled content abuse is "when many pages are generated for the primary purpose of manipulating search rankings and not helping users". Doorway abuse includes "creating substantially similar pages that are closer to search results than a clearly defined, browseable hierarchy". That second line describes a badly built marketplace almost word for word.
A marketplace has what most programmatic projects lack: real data from live listings. Put it on every page:
- active suppliers in that category and region
- typical lead times, minimum order quantities or price ranges from live listings
- certifications held, with counts
- recent reviews and ratings for the suppliers shown
- questions buyers asked about that category on your platform
Then set a publishing rule. Say a category-plus-city page goes live only when eight or more active suppliers sit behind it. Below that, it links up to the region or national category.
A site we own shows how fast pages get indexed, and how little that means on its own:
We launched a new site with 161 guides, each built for one search from the live results and People Also Ask. We submitted the sitemap and pinged IndexNow. No paid indexer. About 25 hours after Google's first crawl, 203 of 228 URLs were indexed. Indexed isn't ranked, though: 5,198 impressions in ten days and 5 clicks.
Page overlap makes it worse. When several page types target the same place, Google can't tell which one to rank. A platform with category, location and attribute pages creates the same overlap at a far larger scale. My view is blunt: "A small silo of incredible pages does better in the meta right now." Fewer pages, each with one clear job.
What is programmatic SEO covers templates, data sources and the test I run before building a page family. Our programmatic SEO service builds marketplace page families on those rules.
What trust signals does a B2B marketplace need?
A B2B marketplace needs proof that its sellers are real and its reviews honest, visible on the page and marked up to match. Procurement buyers check suppliers before they enquire. Answer those checks on the page and you keep the enquiry.
| Signal | What it looks like on the page |
|---|---|
| Verified sellers | A badge that explains what you checked: ABN or EIN, insurance, certifications |
| Real reviews | Reviews from confirmed buyers, with dates, and a published review policy |
| Company facts | Year founded, locations served, response time, order history on the platform |
| Editorial pages | Named authors with real expertise on guides and buying advice |
| Structured data | Product, Offer, AggregateRating, Organization and BreadcrumbList that match what's visible |
One markup rule matters here. Google's review snippet guidelines allow local business review stars "only for sites that capture reviews about other local businesses". A marketplace reviewing its sellers fits. Reviews of your own platform don't.
We build this layer into the templates, so every new listing and category inherits it. That means schema matching the visible copy, seller facts in one consistent format, and review sections with dates and sources.
How do marketplaces get named in ChatGPT and AI Overviews?
Let the AI search crawlers in, then make your category and seller pages the cleanest, most complete source for the question. AI tools lean hard on directories and review platforms, and a B2B marketplace starts with that shape.
Our own panel shows how hard. Perplexity cited a review directory (Semrush Agencies, Clutch, DesignRush and the like) in 36 of 44 agency answers. ChatGPT did it in 20 and Claude in 15. One agency's Clutch profile had six reviews and was cited 20 times.
Those were agency questions. The pattern holds wherever a buyer asks for a shortlist, because the answer engine wants a page of vetted options with reviews. Your category page can be that page.
Getting read is half of it. We put 300 Australian agency-buyer questions to ChatGPT three times each, with search on. It pulled 17,870 search results into those 900 answers and kept 4,389 as sources. Being found is the easy part. About three in four results it reads never make the answer.
The pages that make the cut tend to answer cleanly: facts in plain sentences, options compared in tables, numbers a model can lift.
Which AI crawlers do the big marketplaces allow?
The five marketplaces I checked don't agree.
| Marketplace | AI crawler rules in robots.txt |
|---|---|
| Upwork | Explicitly allows OAI-SearchBot, ChatGPT-User, Claude-SearchBot, PerplexityBot, Google-Extended and Applebot-Extended |
| G2 | Allows GPTBot, ClaudeBot and others, under a stricter list that also closes three-way comparisons and translated folders |
| Capterra | Blocks Bytespider and DeepSeekBot from the whole site |
| Alibaba | Blocks GPTBot and Google-Extended from the whole site |
| Faire | Slows Bytespider with a crawl delay and keeps Applebot off product pages |
Read the bot names carefully. OpenAI says sites that block OAI-SearchBot "will not be shown in ChatGPT search answers", while GPTBot covers model training. Google says Google-Extended "does not impact a site's inclusion in Google Search". So Alibaba stays open to ChatGPT search while keeping its content out of OpenAI training and out of Gemini's training and grounding.
Google's AI Overviews need nothing extra. Its guidance says "There are no additional technical requirements" beyond being indexed with a snippet. First on its list of basics is crawling allowed in robots.txt and by your CDN.
Searchmaxxed tracks the buyer questions in your category across ChatGPT, Gemini, Perplexity and Google's AI Overviews, and records which platforms and suppliers come up. Then we fix the pages and facts that would put you in the answer.
How does marketplace SEO change between Australia and the US?
The method stays the same; the searches, competitors and supply change. A category with 400 US suppliers might have 30 in Australia, which changes which category, location and attribute pages deserve to exist in each country.
- Separate the markets in the URL. Use country folders (
/au/,/us/) and hreflang tags between matching pages. - Publish a country page only with local supply behind it. An Australian buyer searching "contract manufacturers Sydney" wants Australian suppliers, not a US list wearing a new title.
- Use local terms and units. Australian buyers write "aluminium" and compare prices in A$. US buyers write "aluminum", compare in US$ and often specify imperial sizes.
- Expand on purpose. Faire runs a separate sitemap index per language and market, and keeps several small country folders out of crawl.
For a two-sided marketplace going international, the hard part is supply. Follow your sellers.
How do you measure marketplace SEO?
Measure by page type and by side. Overall traffic hides almost everything that matters on a marketplace.
- Submit one sitemap per page type (categories, sellers, listings, comparisons, guides), so Search Console shows indexed counts for each.
- In the Page indexing report, watch "Crawled, currently not indexed" and "Discovered, currently not indexed" by template. A rising count on one template usually means thin pages.
- Track buyer actions by landing page type: RFQs, enquiries, demo requests and orders.
- Track seller actions the same way.
- Check your buyer questions in AI answers monthly and record who comes up.
Every Searchmaxxed managed package includes measurement against competitors in a monthly decision memo. On a marketplace we split it by page type and by side, so you can see which templates earn and which to cut.
Where does Searchmaxxed fit?
Searchmaxxed is an SEO and AI SEO agency for enterprise, B2B SaaS, venture-backed, manufacturing and public-sector companies, marketplaces and platforms included. We do technical SEO, programmatic pages, content, link building, digital PR, GEO, AEO and LLM SEO. The aim: rank in Google and get named in ChatGPT, Gemini, Perplexity and Google's AI answers.
On a marketplace, most early value sits in technical SEO. Crawl rules, facet control, indexation thresholds, templates and schema come first, then the page families buyers and sellers search for.
| Package | Which marketplace it suits | What it includes |
|---|---|---|
| Growth System | A marketplace growing in one or two markets | 30 page releases a month, work on up to four existing pages, one qualified link action, AI visibility tracking |
| Agentic Search Engineering | A crowded category or national market | 50 page releases a month, comparison, industry and integration page families, digital PR and link campaigns, AI answer tracking across ChatGPT, Gemini, Perplexity and AI Overviews |
| Custom & Enterprise | Several markets, a huge catalogue or your own engineering team | Scope can include multiple markets, dedicated engineering, custom reporting and original first-party research |
A page release is an approved new page or a substantial rebuild of one, and technical, schema and internal-link work doesn't eat into that count.
Here's how we do it. We work on a website and repository you own, our Agentic Website. AI agents pull your Search Console and GA4 data, read the Google results, scrape competitor pages and check what AI answers say. That feeds the Managed Search Loop, which shows which template fix, page family or link should bring in the most enquiries next. We build it, check the live page and measure what changed. Off your site, the Off-Page Source Layer covers links, digital PR and mentions, often a data report built from your own listings.
Searchmaxxed's work has generated more than A$10 million in revenue through search for its clients.
Is Searchmaxxed right for you?
We fit when you want technical and content work shipped on your platform every month by the people who planned it. If you want a one-off audit for your own engineers to work through, we're the wrong call.
| Searchmaxxed is a good fit if | Look elsewhere if |
|---|---|
| You run a B2B marketplace or platform with thousands of pages and index problems | You sell on Amazon or another marketplace and want listing optimisation |
| You want facets, templates and schema fixed and shipped, rather than listed in a report | Your engineers will build every change and you only want recommendations |
| You need buyer and seller pages that rank in Australia, the US or both | You don't yet have enough listings to fill a category page |
| You want ChatGPT, Gemini and Perplexity tracked beside Google | You want a reporting dashboard and no changes to the site |
| You want direct access to the people doing the work | You need search to fill this month's pipeline on its own |
Pre-launch, with a few dozen sellers? Spend the year on supply. SEO pays off once there's something worth ranking, and on a marketplace that something is your sellers' listings.
Frequently asked questions
What is marketplace SEO?
Marketplace SEO is optimising a platform that connects buyers and sellers so its category, seller, listing and comparison pages rank in Google. It also covers appearing in AI answers. The core work is index control, faceted navigation, programmatic pages, trust signals and pages for both sides.
What does "B2B marketplace" mean?
A B2B marketplace is where businesses buy from many business sellers on one platform. Think G2 and Capterra for software, Faire for wholesale, or Alibaba for manufactured goods from thousands of factories.
Should a marketplace index every listing page?
No. Index listings with unique detail, such as specs, original photos and verified reviews, and noindex the rest while keeping them crawlable. Many marketplaces set a threshold a listing must pass first.
What is a three-sided marketplace?
A three-sided marketplace adds a third group to buyers and sellers, such as delivery drivers or advertisers. For SEO, each side needs its own landing pages, so a third side means a third set of pages.
How long does marketplace SEO take to work?
Index fixes show first, in Search Console's page indexing report. Rankings for new category and location pages take longer, depending on your supply, your links and how crowded the category is.
Do marketplaces need llms.txt for AI search?
Google's AI features guidance doesn't mention llms.txt. G2, Capterra and Upwork each point to one in their robots.txt anyway. Letting the AI search crawlers in, and writing clean factual pages, matters more.
Is marketplace SEO the same as SEO on Amazon?
No. Amazon SEO is a seller improving products inside someone else's marketplace. Marketplace SEO is the platform owner making the whole site rank in Google and AI answers.
What should you do next?
Pull your indexed page count by template from Search Console, then list your top 20 categories with the number of active sellers in each. Together they show where you're wasting crawl and where the pages worth ranking are. If you'd like us to scope the work for your platform, let's talk pricing.