Install the Mismatch Bridge extension

The extension is required to cross-list to Poshmark, Mercari, Facebook Marketplace, Grailed, and OfferUp. It's optional for eBay / Depop / Nextdoor / Whatnot which use API integrations directly.

Install (developer mode, while in beta)

1. Clone the repo and run cd chrome-extension && npm install && npm run build
2. Open chrome://extensions
3. Turn on Developer mode (top right)
4. Click Load unpacked and select the chrome-extension/dist/ folder
5. Copy the Extension ID shown in chrome://extensions
6. Paste it in Mismatch → Settings → Browser extension → Save
7. Click Test — you should see a green "Connected" status with a version number

How it works

When you click "Cross-list to Poshmark" in the dashboard, the extension opens Poshmark's create-listing page in a new tab and pre-fills the form with your draft. You review the form and click Submit. We never see or store your platform passwords.

Limits

Each platform has rate-limit recommendations to avoid account flags. Poshmark: 20 new listings/day. Mercari: 25/day. Facebook Marketplace: 20/day. Grailed: 50/day. OfferUp: 30/day. The extension warns when you're approaching these.