The eBay arbitrage software: find every price gap before the competition does.
Stop checking eBay manually. By the time you search, filter, and scroll, the listing worth buying is already gone. uBuyFirst monitors eBay continuously against your exact margin criteria, price ceiling, item condition, and seller rating, then alerts you the second a qualifying listing goes live.
Every hour you source by hand is an hour someone else’s tool is running.
The arbitrage buyers cleaning up on eBay aren’t working harder; their sourcing runs on automation. Your manual search catches what’s left. They caught the deal while it was still live.
- Price gaps between platforms close in minutes, not hours
- Sorting through pages of off-target listings burns time you don’t have
- You can’t apply real margin logic to eBay’s native search filters
- By the time a relevant listing shows up in your feed, it’s often already sold
- Restock events and price drops don’t trigger eBay’s native alerts reliably, so qualifying buys go unnoticed entirely
Your sourcing criteria, running around the clock.
- A matching listing triggers an alert within seconds; your criteria do the watching
- Filter stacks go as deep as you need: price ceiling, item condition, seller score, keywords, and more
- The free web app pushes matched listings to email, Slack, Telegram, WhatsApp, and Discord
- Purchase directly from inside the desktop app; no navigating to eBay just to hit Buy It Now
Start free, upgrade when you’re ready to go deeper.
uBuyFirst runs as two products. Most buyers start on the web app and move to a desktop when their operation scales.
- Works on Mac and PC; doesn’t need to stay open to keep sending alerts
- The Notify module monitors your keyword searches and filter criteria, then pushes matched listings the moment they go live
- Delivery channels: email, Slack, Telegram, WhatsApp, and Discord
- Alert stream gives you a live feed of new listings against any keyword, seller, or saved search you’re tracking
- No subscription required to get started
- Always-on scanner with a persistent tray presence; runs continuously in the background
- Alerts fire as desktop pop-ups and push to Telegram or Pushbullet
- Filters go deeper: stack conditions, model numbers, seller thresholds, and price ceilings in any combination
- Every listing detail, including seller history, full photos, and item specifics, is visible inside the app without opening eBay
- Buy It Now, Best Offer, and Commit to Buy all run in-app
- Supports Python scripts and AI analysis over returned eBay results for product identification, lot analysis, and matching against specific buyer requirements
One tool, every arbitrage model.
eBay arbitrage isn’t one model; it’s several, and buyers run different combinations depending on their category, their network, and how they move inventory. uBuyFirst automates the monitoring layer regardless of which play you’re running.
eBay to Amazon arbitrage
Spot an item priced below Amazon’s current market rate, buy it, flip it. The window to act is short. uBuyFirst watches eBay listings against your margin floor continuously and fires the alert the second something clears your criteria.
Amazon to eBay arbitrage
Amazon prices shift, and when they dip below what eBay buyers will pay, there’s money in the spread. Amazon to eBay arbitrage is a timing game more than anything, and uBuyFirst keeps you positioned to move the moment a qualifying listing surfaces.
eBay to eBay arbitrage
Not every arbitrage opportunity crosses platforms. Some of the best deals are already on eBay, mislabeled, undervalued, and underpriced. Deep keyword filtering inside uBuyFirst helps you consistently surface the listings other buyers overlook.
eBay retail arbitrage
For buyers running eBay retail arbitrage alongside physical or wholesale sourcing, eBay needs to function as a low-effort acquisition channel, not something you babysit. uBuyFirst sets your buy rules, lets the alerts run, and only engages when a match clears your criteria.
Retail arbitrage across multiple categories
Scaling retail arbitrage on eBay across more than a handful of categories means you can’t work each one manually. uBuyFirst runs all your saved searches at the same time, each with its own filter configuration, so nothing falls through the cracks between check-ins.
Multi-platform operations
If eBay is one of several sourcing channels you’re working with, uBuyFirst drops into that operation without adding overhead. Your searches run on the same automated feed as every other product category you’re tracking, one tool, one workflow.
Built for buyers who source on speed and precision.
Running a sourcing operation on eBay is a reaction-time business. These are the features that close the gap between a qualifying listing appearing and you owning it.
Real-time listing speed Free + Pro
The faster a new listing reaches you, the better your odds of buying before anyone else does. uBuyFirst uses multiple search methods to surface matching items as soon as they’re listed.
Multi-channel alert delivery Free + Pro
The free web app delivers alerts to email, Slack, Telegram, WhatsApp, and Discord. The desktop app pushes to Telegram and Pushbullet.
Total cost per item Free + Pro
Price on eBay doesn’t always mean what it says. uBuyFirst calculates the full landed cost, item price plus the cheapest shipping option, so your margin math is accurate before you commit.
Direct in-app checkout Pro
Go from a matching result straight to purchase without ever opening the eBay listing page. Buy It Now and Best Offer are both handled inside uBuyFirst through eBay’s secure authentication.
Full listing detail in-grid Pro
Every piece of listing data, item specifics, full description, seller history, and all photos with auto-enlarge are visible inside uBuyFirst without clicking through to eBay.
Python and AI listing analysis Pro
The desktop app supports Python scripts and AI analysis over returned eBay results, covering product identification and criteria matching at a level no manual review can replicate.
Four steps from setup to your first live alert.
Define what you’re looking for
Set your search terms, price limits, condition requirements, seller thresholds, and category filters. Bring in saved searches you’ve already built on eBay or configure new ones from scratch inside uBuyFirst.
Set your notification preference
Web app users choose from email, Slack, Telegram, WhatsApp, or Discord. Desktop users get desktop tray alerts and push delivery via Telegram or Pushbullet. Each individual search gets its own delivery setting; mix and match depending on how urgently you need to act on each one.
uBuyFirst does the watching
eBay’s official API gets queried at whatever interval you configure. Listings that clear your criteria don’t sit in a batch; they reach you in seconds from the moment they go live.
Buy from inside the app
For Buy It Now purchases on desktop, the path from alert to checkout is one click. Best Offer and Commit to Buy are both supported through eBay’s own secure authentication, running inside uBuyFirst.
What you’re actually giving up by not automating.
Manual sourcing has a ceiling. Once you’re running eBay to Amazon arbitrage across multiple product lines, or working eBay and Amazon to eBay in parallel, doing it without automation means you’re always the slowest buyer in the room.
| Sourcing by hand | uBuyFirst | |
|---|---|---|
| Time to see a new listing | Only when you search | Seconds after it goes live, via eBay’s official API |
| Noise control | Manual scroll-and-skip | Stackable filters: price, condition, keywords, seller rating, model number |
| Running parallel searches | Tab by tab, one at a time | All saved searches are monitored simultaneously in the background |
| Catching price gaps | Whenever you happen to check | Set a price trigger once; get alerted the moment a listing hits your number |
| Total cost with shipping | Calculated manually after the fact | Full landed cost (item + cheapest shipping to your ZIP) is shown before you commit |
| Restock and price-drop events | Missed unless you check at the right moment | Monitored continuously; alerts fire when eBay’s native triggers fall short |
| Deal notifications | None; you have to go looking | Free web app: email, Slack, Telegram, WhatsApp, Discord. Desktop: tray alert + Telegram/Pushbullet |
| Closing the purchase | Open eBay, find the listing, navigate to checkout | Buy It Now, Best Offer, or Commit to Buy without leaving the app (desktop) |
| API reliability | N/A | Built on eBay’s current official developer API; won’t break when eBay deprecates legacy endpoints |
What arbitrage buyers running this say.
I’d been doing eBay to Amazon manually for two years. I thought I had a good system until I ran uBuyFirst for a week and realized how many qualifying listings I’d been missing. The alert speed alone was worth the switch.
I source across three product categories and was spending two hours every morning just checking searches. Now that time is basically zero. uBuyFirst watches everything, and I just respond to alerts.
The filter depth was what got me. I flip across platforms, and the noise from generic searches was killing my time. Once I built out my filter stack in uBuyFirst, my hit rate on alerts went through the roof.
