Docs

Getting started

Each marketplace has its own dedicated assistant, so you only install what you actually sell on. Start a 7-day trial from the pricing page, then follow the three steps below.

1. Install the extension

1. Open the Chrome Web Store listing for your marketplace's assistant.
2. Click "Add to Chrome" and accept the permission prompt.
3. Pin the extension to your toolbar so it's always one click away.

• Mercari Seller Pro →
• eBay Seller Pro →
• Comps Pro →
• Whatnot Show Companion →
• CrossList Bridge →

2. Activate your license

1. After checkout, you'll land on the welcome page with your license key. Copy it.
2. Open the extension popup and click "Activate license."
3. Paste your key and confirm. You're now entitled to that product's features.

Your key is tied to your account, not a single device — you can activate it on up to 3 devices, and deactivate old ones from the popup at any time.

3. How confirmation works

Every assistant follows the same rule: it prepares, you confirm. The extension never takes an action on a marketplace without you clicking that specific action yourself, on the marketplace's own page:

• The extension reads and prepares on pages you already have open — it doesn't crawl pages you haven't visited or run in the background.
• Drafts, prices, and suggestions are filled into the marketplace's own form or shown alongside its own page. Nothing posts, edits, relists, or sends until you click that button yourself.
• There's no queued or scheduled activity running unattended — every action happens in the moment you take it.
• If a marketplace's page layout changes and the assistant can't find something reliably, it stops and reports the issue instead of guessing.

You're still responsible for following each marketplace's own terms and seller policies — the extension assists what you choose to do, it doesn't decide for you.