How to crosslist to Whatnot and avoid double selling

Option 1: Bulk import from a CSV file

Whatnot lets you import many products at once from a CSV file. It only works on whatnot.com from a desktop or laptop, not in the app.

1. Download the template for your market and category from Whatnot's help article. There are separate templates for the US, Australia and the Netherlands, Coins, the UK, Germany, France and Belgium, and Japan TCG.
2. Open it in Google Sheets, make a copy, and add one row per product: Category, Sub Category, Title, Description, Quantity, Type, Price, Shipping Profile, Condition (if required) and up to eight image URLs.
3. Copy Category, Sub Category, Type, Condition and Shipping Profile exactly from the template's Values tab. Use a listed shipping profile or the name of a custom profile you already created; don't type your own weights.
4. Image URLs must use https, be publicly accessible and need no sign-in. Test one in a private window: if it loads there, it will work.
5. Download the sheet as CSV and choose where it goes:
   • Inventory: Seller Hub, Inventory, Import from CSV. Products become draft listings you can edit, publish to your profile shop or add to a show. Each needs at least one image before you publish.
   • A show: Seller Hub, Shows, open the show, Add, Create Temporary Listing, Upload CSV.

Every import creates new drafts. To fix a mistake, edit the drafts, or bulk delete them and import a corrected file so you don't end up with duplicates.

Option 2: Whatnot's Seller API

Whatnot publishes a Seller API at developers.whatnot.com for managing products and variants, inventory quantities, show lineups, orders and shipments (including shipping labels and tracking codes), plus show analytics. It also offers a hosted MCP server so AI agents can work with your own API token. Tools built on the API can keep stock in sync without reading the Whatnot page, so ask any tool you consider which method it uses.

Avoid double selling

An item listed on Whatnot and on eBay or Poshmark can sell twice when one channel does not know about a sale on the other. Three controls reduce the risk. Ranked by how much they prevent overlap:

1. Pause other listings before a show. The item is locked elsewhere before anyone can buy it. SellDeck works this way for eBay and Depop.
2. Delist automatically on sale. A crosslisting tool detects the Whatnot sale and removes the item from other channels. This depends on sync timing and, for some tools, on your computer staying on.
3. Mark sold manually. This is the fallback. It only works if you update every channel right after each sale.

Pausing is ranked first because it closes the window before a sale can happen. Automatic detection still leaves a gap between a sale and the delist.

Tools in the directory

Crosslisting managers:

• Vendoo imports your active Whatnot listings, crosslists to Whatnot, and delists sold items from other marketplaces. Its Whatnot help article labels the integration BETA. Sale detection needs your computer to stay on. Starter costs $14.99 per month billed monthly (prices as of 2026-11-06).
• Crosslist publishes one listing form to many marketplaces and includes autoposting, delist and relist. Its Whatnot integration page describes publishing to Whatnot, but its pricing page does not name Whatnot. Bronze costs $29.99 per month for 200 new listings.
• List Perfectly lists unlimited items on all plans, according to its blog, and tracks mark-sold, delist and relist actions. Its pricing page does not list Whatnot as a supported marketplace. Simple costs $29 per month.
• Nifty names Whatnot only in its homepage FAQ. Its pricing page does not list Whatnot. Its automation covers Poshmark, eBay, Mercari and Depop. Confirm the Whatnot feature before you subscribe.

Delisting and pausing:

• SellDeck pauses matching eBay and Depop listings when a Whatnot show starts, then restores unsold items afterward. Its Free plan covers up to 25 items and 2 shows per month. Starter costs $8.99 per month (prices as of 2026-11-06). The site says it is not affiliated with Whatnot.

CSV exporters:

• Shopify to Whatnot is a Chrome extension that converts Shopify product data into a Whatnot-ready CSV. It is a file-based bridge, not a live inventory sync. Pricing is not stated.
• TCG Automate is a web tool that exports trading card listings to a Whatnot-ready CSV with image URLs, in auction or Buy It Now format. Plan prices are on a separate page that was not checked.

As of 2026-11-06, none of the tools above is recorded in the directory as using Whatnot's Seller API; they rely on their own integrations, browser extensions or CSV files. Browse all inventory and cross-listing tools.