Selling and listing
List on Poshmark, Mercari, Facebook Marketplace and more
Publish straight to eBay and Bonanza, then cross-list to a dozen more marketplaces with the Chrome extension or the paste kit.
Underpriced AI publishes directly to two marketplaces and helps you fill in the rest, either with a browser extension or by copy and paste.
Publish directly to eBay and Bonanza
- Go to Settings, open Connections, and connect eBay or Bonanza.
- Open a saved item and scroll to the Create Listing section.
- Check the title, price and description, then pick a category and condition.
- Publish. After it goes live you get a link to view the listing.
eBay publishing works in 10 countries: US, UK, Canada, Australia, Germany, France, Italy, Spain, Netherlands and Belgium.
Cross-list everywhere else with the Chrome extension
Poshmark, Mercari, Facebook Marketplace and District do not offer public APIs, so nothing can be posted to them silently. Our free Chrome extension (desktop Chrome or Edge) does the typing instead. Open a saved item, click to cross-list, and the extension opens that marketplace's own create form with your title, price, description and photos already filled in, plus condition on Facebook. You review the details, pick the category, and click Post.
It works with Facebook Marketplace, Poshmark, Mercari, Depop, Whatnot, Vinted, OfferUp, Etsy, District, Craigslist, 1stDibs and Ruby Lane. It runs entirely in your browser, so we never see your marketplace logins.
On a phone, use the paste kit
Phone browsers cannot run extensions. Every item page has a paste kit instead: tap-to-copy buttons for the title, price, condition and description in the order that platform's form asks for them, a Share Photos button that sends all photos to your phone's share sheet, and a Download Images button that bundles them into one zip. Paste each field into the marketplace's own app and post.
Picking a marketplace
eBay suits electronics, collectibles and niche items. Poshmark is strongest for clothing and fashion. Mercari works well for general goods. Facebook Marketplace is best for large or local pickup items. Many resellers list on several platforms at once for more exposure.
Frequently asked questions
- Can I cross-list from the iPhone or Android app?
- Direct publishing to eBay and Bonanza works on web or mobile. One-click cross-listing needs our Chrome extension, which runs on desktop Chrome or Edge only, because phone browsers cannot run extensions. On a phone, use the paste kit on each item page to copy the fields and share the photos.
- Does Underpriced AI post to Poshmark or Mercari automatically?
- No. Those platforms do not offer public APIs, so nothing is ever posted for you. The Chrome extension opens their create-listing form and fills in your title, price, description and photos. You review the details, pick the category, and click Post yourself.
- Will Underpriced AI delist an item from other marketplaces when it sells?
- There is no automatic delisting across platforms. You can end an eBay listing from the item page using the End on eBay button under Listed on eBay. Listings you created on other marketplaces live in those accounts, so you end those in the marketplace itself.
Related guides
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Updated 2026-09-05. Something wrong or missing? Tell us and we fix the guide, not just the reply.