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, tap Copy it step by step on the item page: it saves the photos and copies each field in the order the marketplace asks, and you post it in their app.

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.

List on Poshmark, Mercari, Facebook Marketplace and more | Help

List on Poshmark, Mercari, Facebook Marketplace and more

Publish straight to eBay and Bonanza, fill other marketplace forms with the desktop Chrome extension, or copy each field on your phone.

eBay and Bonanza listings post directly (Discogs too, for records). For Poshmark, Mercari and Facebook, our desktop Chrome extension fills the form for you; on your phone we copy each field for you to paste. Here is how each of those works.

Publish directly to eBay and Bonanza

Go to Settings, then Marketplaces, and connect eBay or Bonanza (or Discogs, for records).
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 and Facebook Marketplace do not offer public listing APIs, so we cannot post to them for you. 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, copy it step by step

Phone browsers cannot run extensions. Instead, open the item, pick Poshmark, Mercari, Facebook Marketplace, Depop, Vinted or OfferUp in the Create Listing section, and tap Copy it step by step. One screen opens for that marketplace: save the photos to your phone first, then copy each field in the order that marketplace's form asks, ticking each one as you paste it. The Open button starts the listing in their app, and you post it yourself. For other marketplaces the item page has Copy buttons and Download Images.

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, tap Copy it step by step on the item page: it saves the photos and copies each field in the order the marketplace asks, and you post it in their app.
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.

Try it on web or mobile

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Updated 2026-09-28. Something wrong or missing? Tell us and we fix the guide, not just the reply.