Facebook's built-in notifications arrive hours late, if at all. A dedicated Marketplace monitor polls the search results every few minutes and pushes an alert to your phone the second a matching listing appears — so you message the seller before the rest of the city sees it.
A Marketplace monitor is a background service that watches Facebook Marketplace search results for new listings matching your criteria — keywords, price range, location — and notifies you the moment a match appears. It runs even when the app and browser are closed, polling Marketplace at a configurable interval and pushing an alert to your device as soon as something matches.
The point isn't to replace Marketplace. It's to make sure you never miss the listing that actually matters — the one that goes up at an off-market price and gets bought within minutes by whoever messaged the seller first. Without a monitor, that "whoever" is the person who happened to be scrolling Marketplace at the right second. With a monitor, it's you.
Most resellers assume that turning on Facebook's "Save search" button will push them an alert when a new listing appears. It will not — not reliably, and rarely in time to act. Three reasons this is the case:
Facebook batches Marketplace alerts and only fires them when the listing crosses an internal "quality" threshold based on engagement signals. For most saved searches, the result is a 2–4 hour delay between when a listing appears and when (or if) you get notified. By that time the listing usually has 5–15 messages from people who happened to be browsing Marketplace at the right minute.
For the Facebook app to push you a saved-search alert, you need both the system-level notification permission (the iOS or Android dialog) and the in-app toggle for Marketplace notifications under Settings → Notifications. Most accounts have one but not the other, so they get nothing at all and never realise it.
Facebook's desktop site has no push channel for saved searches whatsoever. If you mostly use Marketplace on a laptop, you are not receiving any alerts at all — you simply have to refresh the search tab manually.
SniprHQ runs an independent scraper that polls Marketplace at your monitor's interval and pushes matches over the Web Push Protocol — the same standard Slack, Twitter, and WhatsApp Web use. The technical flow:
Push delivery works across iOS 16.4+ (Safari, installed to home screen), Android (Chrome, Edge, Brave), macOS Safari, Chrome, Firefox, Windows Chrome, Edge, and Firefox. No App Store download required, no native app to maintain, no Facebook account to connect.
Here is what the resulting alert feed looks like inside the SniprHQ app — fresh matches with image, price, and location, the green dot indicating a notification still unread:
The interval is the upper bound on how late your first alert can be after a listing appears. A 60-minute interval means a listing posted at 14:01 won't be detected until 15:00 — by which time it's gone. A 5-minute interval means the worst case is a 5-minute lag. In fast-moving categories like GPUs and modern iPhones, that difference is often the difference between buying the deal and not.
Marketplace monitoring is most valuable when three conditions hold: listings move fast (sold within 1–4 hours of posting), resale spread is high (€100+ between buy and sell), and the seller is in a hurry — estate sales, relocations, "must sell today" postings. Categories where SniprHQ users report consistent wins:
| Category | Typical buy price | Resale spread | Sells within |
|---|---|---|---|
| RTX 4090 GPUs | €1,200–1,400 | €250–450 | 30 min |
| Stokke Tripp Trapp chairs | €40–120 | €100–200 | 2 hours |
| iPhone 15 Pro (unlocked) | €600–700 | €120–200 | 1 hour |
| Herman Miller Aeron chairs | €350–450 | €200–300 | 3 hours |
| PS5 Slim consoles | €280–330 | €60–120 | 2 hours |
| Lego Star Wars (rare sets) | €100–180 | €80–160 | 4 hours |
The pattern across these categories is identical: a seller posts at an off-market price, resellers see it within minutes, and the listing is gone before anyone outside that small group even knew it existed. The instant-alert advantage compounds — over a year, the difference between "I saw it eventually" and "I messaged within 90 seconds" is the difference between making a few deals and making a steady income from flipping.
Resellers who haven't set up a monitor usually default to one of two strategies: refresh a Marketplace search 30 times a day, or rely on Facebook's saved-search alerts. Here is what each actually delivers:
| Manual refresh | FB Saved search | SniprHQ monitor | |
|---|---|---|---|
| Coverage hours | When you remember to check | App must be active | 24/7 background |
| Typical notification delay | N/A — you refresh | 2–4 hours | 2–10 seconds |
| Filter precision | Set per search | Keyword only | Keyword + price + location |
| Multiple parallel searches | A tab per search | Limited per account | Up to 5 monitors |
| Push to desktop / laptop | No | No | Yes (Chrome, Edge, Firefox, Safari) |
| Catches every matching listing | Only if you refresh non-stop | Only "qualifying" subset | Every match in the polling window |
Underpriced listings appear and disappear in minutes. Catching them consistently is less about scrolling harder and more about removing the human latency from the equation. A practical setup:
For a deeper breakdown of which categories produce the highest margins, see our guide to the best items to flip on Facebook Marketplace.
A Marketplace monitor is a background service that continuously checks Facebook Marketplace for listings matching your criteria — keywords, price range, location — and sends a push notification the moment a match appears. It runs around the clock so you don't have to refresh the search tab manually.
Facebook's saved searches batch notifications through their internal ranking model. In practice that means 2–4 hour delays for most categories and zero notifications on desktop. A dedicated monitor polls Marketplace every 5–15 minutes and sends a push within seconds of finding a match.
Yes. SniprHQ uses the standard Web Push Protocol (the same one Slack, WhatsApp Web, and Twitter use), so push alerts wake the device and display on the lock screen even when the app is closed.
Yes, on iOS 16.4 and later. You add SniprHQ to your home screen via Safari (Share → Add to Home Screen), open the icon once to enable notifications, and pushes work the same as native apps from then on.
No. SniprHQ scans Marketplace's public search results — the same listings anyone can see without logging in. You never connect your Facebook account, and there is no risk to your profile.
Manual refreshing only catches listings while you are actively looking. Even a dedicated refresher who checks every 5 minutes will miss listings that get bought within those 5 minutes. SniprHQ delivers the alert as a push to your phone within seconds of the listing appearing, regardless of whether you have Marketplace open.
Yes. Free plans run one monitor; paid plans run up to 5. You can have separate monitors for, say, Stokke chairs in Stockholm under €150, RTX 4090 GPUs under €1,400 nationwide, and iPhone 15 Pro under €700 locally — all running in parallel.
Anything with fast resale and limited supply: GPUs, MacBooks, iPhones, designer chairs, vintage cameras, Lego sets, e-bikes, drones. The pattern is: the seller is in a hurry, prices it below market, and within minutes resellers are messaging. Without an instant alert, the first message is from someone else.
Yes. The Web Push Protocol delivers through your browser's notification service even when the SniprHQ tab is not open. On phones, the device receives the push the same way it receives a WhatsApp message — no app needs to be running.
SniprHQ scans Marketplace's underlying search endpoints rather than scraping the rendered HTML. The endpoints change less often than the visual layout, so monitors keep working through most Marketplace UI updates. When endpoints do change, the scraper is updated server-side and every monitor keeps running with no action from you.
If you want to dig into specific pieces of the Marketplace-monitoring workflow: