Free eBay auction checker for collectors
Is that bid sus?
Screenshot an auction’s bid history. Susbid shows which publicly visible signs of possible shill bidding are present, the bids behind each one, and the innocent reasons it might be there. You decide what it means.
- No account
- No paid tier
- Screenshots deleted once read
Bid history · 14 bids
Sign presentSmall consecutive bids under the leader
| Bidder | Bid | Note |
|---|---|---|
| l***r (210) | $31.00 | automatic |
| p***e (3) | $30.00 | |
| l***r (210) | $29.00 | automatic |
| p***e (3) | $28.00 | |
| l***r (210) | $27.00 | automatic |
| p***e (3) | $26.00 |
How a check works
Three captures, about a minute, and you see what we see.
- 01
Capture the bid history
On the listing, tap the number of bids. Take a full-page screenshot (iPhone: Full Page; Android: scrolling screenshot) and upload it.
- 02
Confirm what was read
Susbid shows the bids, bidders and retractions it read, with anything uncertain highlighted. Fix or confirm before the report runs.
- 03
Add the two busiest bidders
The two strongest signs live on each bidder’s detail page. Tap their masked names on eBay, capture those pages, and the report fills in.
What it looks for
The signs in every check
- Strong sign001/003
Bids concentrated with this seller
A bidder whose recent bidding is almost all on this one seller’s items.
How to read it - Strong sign002/003
Bid retractions
Bids taken back, especially by a bidder who was leading at the time.
How to read it - Moderate sign003/003
Small consecutive bids under the leader
Three or more small bids in a row that each fall just short of the leader’s maximum.
How to read it
A magnifying glass, not a judge.
Every sign Susbid checks is something you could find on eBay yourself, just slower. It never says a seller is shill bidding, never scores anyone, and never keeps a list of stores.
Signs, not verdicts
Each one is present, absent, or not enough data. No score, no label on anyone.
Evidence first
The actual bids and bidder summaries behind every sign, in plain monospace.
Innocent explanations
They sit right beside each sign, not behind a link.
Published method
Every threshold is on the methodology page. Nothing hidden in a model.
Spot the Sus
Think you can read a bid history?
Made-up auctions, no real sellers. See how many signs you catch before Susbid does.
Take the quizWatching an auction?
Check it before you bid.
Works from a phone screenshot or, on desktop, the bookmarklet. Nothing to install, nothing to sign up for.
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