Marketplaces

Rejected on one marketplace. Retyped for the next.

Cernel fits each product to every marketplace's categories, value lists and title rules, from the same facts, before you upload.

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Sound familiar?

Same products. A new spreadsheet for every marketplace.

Every marketplace wants its own version of the product.

  • You find out it's wrong when the listing bounces.
  • Each new channel multiplies the work.

Cernel writes each product to each marketplace's rules from the same facts, so it is right before you upload it.

Marketplace templategeneral-marketplace_template.csv3 of 4 bounced
ProductColour familyMaterialCapacity
Bottle, 500 mlMossNot on listCoated steelNot on list500 ml
Bottle, 750 mlMossNot on listMetalRequired
Casserole, 24 cmBlackCast ironRequired
Casserole, 20 cmCreamTypingEmptyEmpty
Three more sheets to go: the outdoor, home and sports marketplaces.
Up to 45%
of Gen Z shoppers abandon a purchase when product details do not match across sitesSalsify Consumer Research, 2026
54%
of shoppers use two to three channels for mid-range itemsSalsify Consumer Research, 2026

A version per marketplace

Same bottle. Four marketplaces. Four rulebooks.

One marketplace stops the title at 60 characters, the next allows 150. One wants five bullet points, another none. Paste the same text everywhere and it fits nowhere, so your team rewrites the same product for every channel. In Cernel every marketplace field has its own agent, written to that marketplace's rules from the same product data, so the facts match everywhere.

Your catalogueInsulated steel bottle, 500 ml

  • Moss
  • 500 ml
  • Powder-coated stainless steel
  • Cold 24 h, hot 12 h
  • Leak-proof screw lid

Outdoor marketplace: title "Insulated steel bottle 500 ml, cold 24 h, hot 12 h, leak-proof lid, dark green" (78 of 80 characters). Bullet points: Keeps drinks cold for 24 hours, hot for 12; Leak-proof screw lid; Double-walled stainless steel. Colour: Dark green, Capacity: 0.5 l, Keeps cold: 24 h. Description, plain text, up to 1,000 characters. Home marketplace: title "Insulated bottle, 500 ml, olive" (31 of 60 characters). No bullet points. Colour: Olive, Material: Steel, Capacity: 500 ml. Description, html, short paragraphs. Sports marketplace: title "Insulated sports bottle 500 ml, stainless steel, cold 24 h, leak-proof screw lid, green" (87 of 100 characters). Bullet points: Cold for 24 hours, hot for 12; Leak-proof in a kit bag; 500 ml, double-walled steel. Colour: Green, Volume (ml): 500, Insulated: Yes. Description, plain text, up to 500 characters. General marketplace: title "Insulated Stainless Steel Water Bottle, 500 ml, Double-Walled, Keeps Drinks Cold 24 Hours and Hot 12 Hours, Leak-Proof Screw Lid, Green" (135 of 150 characters). Bullet points: COLD FOR 24 HOURS: double walls keep water cold all day; HOT FOR 12 HOURS: coffee or tea stays hot; LEAK-PROOF: a screw lid that closes tight. Colour family: Green, Material: Metal, Capacity: 500 ml. Description, plain text, no html, up to 2,000 characters. On the general marketplace a review step held a bullet point that claimed the bottle is dishwasher safe, which the product data does not say; your team edited it and approved. Each listing is then exported for its marketplace.

Example product, marketplaces, rules and texts. Cernel prepares the data; you upload it in the marketplace's seller tools, or your feed tool sends it.

A category tree per marketplace

Every marketplace sorts the shelf its own way.

Your shop files the bottle under Kitchen. An outdoor marketplace wants it under Camping, a general marketplace four levels down under Home & kitchen. In Cernel each marketplace's category tree sits next to yours. An agent places each product in the most specific category that fits, and that category brings the fields the marketplace asks for.

Your catalogueInsulated steel bottle, 500 ml

  • Your shop

    KitchenDrinkwareWater bottles

    Asks for Capacity, Material, Colour

  • Outdoor marketplace

    CampingHydrationInsulated bottles

    Asks for Capacity, Keeps cold, Keeps hot, Weight, Material, Colour

  • Fashion marketplace

    SportsSports accessoriesBottles

    Asks for Colour, from list, Sport, Capacity, Material

  • General marketplace

    Home & kitchenKitchen & diningDrinkwareInsulated bottles

    Asks for Colour family, Material, Capacity, Five bullet points

Example category trees and fields.

Rejected for one word

You call it Moss. One marketplace takes Dark green, the next only Green.

Every marketplace has its own list of colours, materials and sizes. Send a value that isn't on it and the listing is rejected, usually after you have uploaded it. Cernel sets up an agent for each marketplace field, with that marketplace's rules and value list, so every value it writes is one the marketplace accepts.

A matte green insulated steel water bottle standing on a white table against a white wall
CernelSteel bottle, outdoor marketplace versionEvery value on its list
FieldYour valueOutdoor marketplace
ColourMossDark green
MaterialPowder-coated stainless steelStainless steel
Capacity500 ml0.5 l
Keeps coldUp to 24 hours24 h
Every value is one the outdoor marketplace accepts. Your own values stay as they are.

Example values.

  1. The marketplace's list goes in once

    Each marketplace's colours, materials and sizes become the only values its field can take.

  2. An agent per marketplace field

    It reads your product, follows that marketplace's rules and picks the closest value on its list.

  3. Your names stay yours

    Moss stays Moss in your shop. Each marketplace gets the word it accepts, from the same product.

Before you upload

Find the gaps before the marketplace does.

An empty required field bounces the listing. An empty filter field lets it through, to a place where shoppers who filter never see it. Cernel measures completeness per marketplace and per market, agents fill only what is missing, and you export the products where every field the marketplace asks for has a value.

A matte black cast iron casserole with its lid on, standing on a black induction hob

Example category, products and figures.

Exports

Each marketplace gets the file it reads. Ready to upload.

Cernel prepares each marketplace's version, ready to upload in its seller tools or to send through the feed tool you already use. The ready products leave as a file in that marketplace's own column names and order, one language per file, or your feed tool picks up approved values over the API.

A file per marketplace

home-marketplace_casseroles_de.csv

skueanarticle_namecapacity_lhob_type
304185709876543210Gusseisen-Bräter, 24 cm, Schwarz4,2Alle, inkl. Induktion
304215709876543227Gusseisen-Bräter, 20 cm, Creme2,4Alle, inkl. Induktion
304335709876543234Gusseisen-Schmortopf, 28 cm6,7Alle, inkl. Induktion
304405709876543241Emaillierter Bräter, oval, 31 cm5,5Gas, Elektro
Columns named and ordered to the marketplace's template, in German, ready to upload in its seller tools.

The API

GET /changes

{  "property": "hob_type",  "value": "All hobs, incl. induction",  "taxonomy_name": "Home marketplace"}
Your feed tool picks up approved values over the API and sends them on.

Example files. The API response is shortened.

What changes

One catalogue. A ready version for every marketplace.

What goes out

  • A file per marketplace and language, in its own columns and order
  • The API, for your feed tool or your own code
  • Your own shop and PIM, from the same catalogue

What you control

  • Each marketplace's categories, fields and value lists, next to your own
  • One agent per marketplace field, with that marketplace's rules in its prompt
  • You choose which values go live automatically and which get a review step; review steps check every value and only ask a person when something fails or needs a decision

What you see

  • Completeness per marketplace and per market: which products still miss a field
  • Every AI-written value with its inputs, reasoning and prompt
  • Where each value came from: an agent, an import or a person

What teams get back with Cernel

All customer stories
  • Molly & My

    Molly & My builds every market on one foundation

    products enriched across 8 markets
    20,000
    faster time to market
    4x
    organic traffic to product pages
    +29.3%
    Read the story
    A stack of folded knitwear in low warm sunlight
  • Firtal Group

    Firtal Group added a thousand extra hands without adding headcount

    products enriched
    +25K
    organic traffic to product pages
    +20%
    faster time to market
    +80%
    Read the story
    In the warehouse at Firtal Group
  • Tiffany Lighting Direct

    Tiffany Lighting Direct gets a new supplier range live in days, not months

    to get a new supplier range live
    Days
    products from 20+ brands
    13,000+
    extra hires needed
    0
    Read the story
    A stained-glass table lamp on a wooden table in a quiet cafe

FAQ

Questions marketplace teams ask us.

  • How does the data get to each marketplace?

    Cernel prepares each marketplace's version, ready to upload in the marketplace's seller tools or to send through the feed tool you already use. It leaves as a file with that marketplace's columns and order, one language per file, or your feed tool picks up approved values over the API.

  • Can we keep different values per marketplace?

    Yes. Each marketplace gets its own fields next to yours, holding that marketplace's value list, and an agent set up with its rules picks from it. Your own naming stays as it is. Each marketplace's category tree sits next to yours too, so a product carries the fields its marketplace category asks for.

  • How do we handle several markets?

    Every language you add is also a market. Content is written fresh or translated per language, each with its own instructions, and each country gets its own file.

  • How do we know a product is ready for a marketplace?

    Track the fields a marketplace's category asks for. Completeness shows which products and fields are still empty, per marketplace and per market, agents fill only what is missing, and you export the products that are complete.

  • Does every value need a person to approve it?

    No. You choose which values go live automatically and which get a review step; review steps check every value and only ask a person when something fails or needs a decision. A step can check a marketplace's title length or a claim your product data does not back, and a person sees the value with its inputs and reasoning.

Bring one product and the marketplaces you sell on.

In a demo we place your product in each marketplace's categories, write its title, bullet points and description to each one's rules, and show you which fields each marketplace still misses.

Book a demo