Who Watches the Watchlist — Watchlist Monitor for eBay

Track price history for eBay watchlist items with alerts when prices change. Price data stays on your device; usage counts only.

This project started because I'm an eBay super user and noticed that prices on my watchlist seemed to change over time without me being able to confirm. I was always asking questions: • Is this item at its best price or its highest price? • Did the seller increase the price and then immediately drop it to show a discount that isn't a real discount? • Is an item slowly decreasing over time and I should wait until it hits a target? With Who Watches the Watchlist now you can know for sure! I'm a solo developer who uses this extension every day for myself so it is always being refined. Feedback and bug reports are greatly appreciated and will be responded to. eBay is one of the great holdovers from the early internet but how do you know when an item on your watchlist hits the price you want? Who Watches the Watchlist records the price of every item on your eBay watchlist and tells you when one moves. How to use Who Watches the Watchlist Sign in to eBay in this browser, install the extension, and you're done. There is nothing extra to sign up for. A few times a day it checks your watchlist in the background using the eBay account you're already signed into and writes down each item's current price. You can change the schedule or press Refresh now any time from the dashboard. When an item you've set an alert on crosses your threshold, you get a desktop notification. No personal data leaves your computer. No tracking, no usage data, no separate accounts. The only thing the extension ever loads from the internet is your own eBay watchlist page. Earning a commission (on by default, one-click opt-out). When you click an item from inside the extension to view it on eBay, the click goes through eBay's affiliate program with our partner ID — so if you happen to buy that item within 24 hours, eBay pays us a small commission. The price you pay does not change. We receive only aggregate click and purchase counts from eBay, never your personal information. You can turn this off any time from the dashboard's settings. What it does • Builds a price history for every active item on your eBay watchlist • Per-item charts on the dashboard, with all-time low / high / average and a clear summary of whether the price actually moved or just bounced and came back • Price-change notifications you configure per item — set a dollar threshold, a percent threshold, or both, and choose increase / decrease / either direction • A master notifications switch to silence everything (e.g. while away) • Auctions are tracked too (the current bid) • Search and sort your tracked items (recently added, price, name) • One-click CSV export of the full per-item summary How it works (the important bit) The extension only checks prices while Chrome is running. If Chrome is fully closed for a while you'll see a gap in the history — it resumes automatically next time you open Chrome. Checks are scheduled (default every 4 hours; configurable) and you can also press "Refresh now" any time. You must be signed in to eBay in the same browser. Privacy No personal data leaves your computer. There are no separate accounts, no usage tracking, and no outside services involved beyond eBay itself. All price history is saved in your browser. The only thing the extension ever loads from the internet is your own eBay watchlist page, using the sign-in you already have. The extension never bids, buys, or changes your watchlist. By default, clicks on items in the dashboard go to eBay through eBay's affiliate program (see "Earning a commission" above); you can turn this off in settings. See PRIVACY.md for the full policy. FAQ Q: Do I need to sign up for anything extra? A: No. It just uses your normal eBay sign-in in this browser. No separate account, no special setup. Q: Does it bid or buy anything? A: No. It only reads prices. It never bids, buys, or changes anything on your account. Q: Does the developer make money from this extension? A: Maybe a little. By default, clicks on items inside the extension go to eBay through eBay's affiliate program. If you then buy the item within 24 hours, eBay pays us a small commission — your price doesn't change. The developer never receives your personal information. You can turn this off any time from the dashboard's settings. Q: Why is there a gap in the price history? A: The extension can only check while Chrome is running. It catches up on the next check after you reopen Chrome. Q: Can it track an item that isn't on my watchlist? A: No. Add it to your eBay watchlist first. Q: Does it sync across devices? A: No. Your price history is saved in this one browser only. Use the CSV export if you want to copy it elsewhere. Q: An item I was tracking disappeared. A: When an item leaves your eBay watchlist (sold, ended, or you removed it) it drops off here too, after two checks in a row confirm it's gone. Q: What happens if I switch eBay accounts in the same browser? A: The extension notices on the next check and pauses reconciliation, so the items and price history from the original account aren't deleted. A banner in the extension explains the choice: sign back into the original account to resume tracking it, or click "Continue with <new account>" to commit the switch (the previous account's items will be removed on the next check). To track two accounts at once, install the extension in two separate Chrome profiles; each profile has its own isolated data.