CHATGPT + OPTIMLISTER

Crosslist one listing across marketplaces from ChatGPT.

Connect once and ChatGPT becomes a crosslisting tool: describe the product once, and ask for it rewritten for any of the six marketplaces Optimlister covers - each version follows that marketplace's own title length, tag or bullet rules and its own keyword demand, because a listing copy-pasted across marketplaces under-performs the one written for it.

Also works with

CONNECT IN THREE STEPS

Get your key. Every Optimlister plan has an API key, Free included - it lives in your account.
Add the connector. In ChatGPT: Settings, then Connectors, then Create. Use the URL https://optimlister.ai/api/mcp with your key as a Bearer token - or, if your client only accepts a URL, https://optimlister.ai/api/mcp?key=opk_...
Ask. That is the whole setup. Your first successful connect adds 10 credits to your balance.

Key lives at your account · full setup details on the Connect your AI page.

WHY CONNECT IT

Rewritten, not copied

Each marketplace has its own title length, tag rules and buyer search behavior - the same product gets a genuinely different listing per marketplace, built on that marketplace's own keyword demand.

Six marketplaces, one conversation

Amazon, Etsy, eBay, Walmart, Shopify and TikTok Shop are all reachable from the same chat, so a seller crosslisting a catalog does not switch tools per marketplace.

Compliance checked per marketplace

Character limits, required fields and prohibited claims are checked against each marketplace's own rules before you paste anything in.

PASTE THIS TO START

I sell this product: <describe it>. Write me the Amazon version first, then the Etsy version, then the eBay version - each one built to that marketplace's own rules and keywords, not the same text copy-pasted.

Get your key How connecting works

Questions

Is crosslisting not just copying the same listing everywhere?

That is what most crosslisting tools do, and it under-performs - Amazon's 75-character Item name plus 125-character Item Highlights structure reads wrong on Etsy's buyer-friendly title and tag system. Optimlister rewrites the listing per marketplace instead of copying it.

Does this cost extra on top of ChatGPT?

The MCP server and API key come with every Optimlister plan, including Free. Tool calls price exactly like the site: listings use your monthly listings, photos and video use credits at the same rates, and free tools stay free.

Is this official MCP?

Yes - Optimlister runs a standard MCP (Model Context Protocol) server over HTTP, the same open standard ChatGPT uses for all its connectors. One URL, one key, no extension to install.

Can it work from a listing I already have somewhere else?

Yes - paste the existing listing's text and ask for it rewritten for a different marketplace; it works from what you give it rather than starting from nothing.

See it work

Three steps, and what each one actually produces - words, pictures and video.

Give it what you have

A listing, a link, a photo, a product name, or the email a marketplace just sent you.

It writes, draws and checks, per marketplace

Six different listings and the images to go with them, each to that marketplace's limits and rules, with measured keywords behind the words.

You publish; it keeps watching

Files, exact fields or one-click fill; then daily rank, price and listing-health watch.

One product, six listingsExample · bamboo cutting board · pictures made by Optimlister

Why each version differs: every card is written fresh to the rule printed on it - Amazon now uses a 75-character Item name plus 125-character Item Highlights and benefit bullets, Etsy uses buyer-friendly titles and up to 13 tags, eBay uses item specifics, and Walmart uses structured attributes. The meter under each title shows how much of that marketplace's title limit the example uses. Every asset here is a real generator output with its exact cost - see the receipts.

Example Amazon image for the bamboo cutting board

Amazon75-char Item name · 125-char highlights · 5 bullets

Bamboo Cutting Board 17×11 in, Juice Groove, Reversible

Deep juice groove catches runoff from meat and fruit
Reversible: groove side for carving, flat side for bread
Knife-friendly bamboo, no dulling

Example Etsy image for the bamboo cutting board

Etsy140 chars · 13 tags · lifestyle first

Large Bamboo Cutting Board with Juice Groove - Housewarming Gift, Charcuterie Board, Kitchen Decor

cutting boardcharcuteriehousewarming giftbambookitchen decorjuice groove+7

Example eBay image for the bamboo cutting board

eBay80 chars · item specifics

Bamboo Cutting Board 17x11 Juice Groove Reversible Large Chopping Block NEW

Material: Bamboo
Size: 17 in x 11 in
Features: Juice Groove, Reversible
Condition: New

Example Walmart image for the bamboo cutting board

Walmart75 chars · key features · white main image

Bamboo Cutting Board with Juice Groove, 17 x 11 in, Reversible, Knife-Safe

Juice groove keeps counters dry
Reversible two-sided board
Hand wash, oil monthly

Example Shopify image for the bamboo cutting board

Shopify70-char SEO title · tags · alt text

Bamboo Cutting Board 17×11 with Juice Groove | Reversible

bamboocutting boardkitchengift

Example TikTok Shop image for the bamboo cutting board

TikTok Shop255 chars · attributes · video first

Large Bamboo Cutting Board with Juice Groove 17x11 - Reversible Chopping Board for Meat, Veg and Charcuterie Nights, Knife-Friendly

Material: Bamboo
Size: 17 x 11 in
Hook line for the video caption

Same product, six different texts and the right picture for each - white main image where the marketplace demands it, lifestyle where buyers browse by feel, the infographic where video and scroll do the selling. Bars show how much of the title limit is used.