Shill Bidding

Short answer: shill bidding generally means bidding used to inflate price or apparent demand without genuine buying intent. A bid pattern can justify review, but public activity alone rarely proves who controlled an account or why a bid was placed.

How It Works

Self-bidding: Seller creates second account, bids on own listing. If shill wins → cancels and relists.

Friend/family: Seller asks someone to bid. Same pattern — inflates price, never completes.

Bidding ring: Multiple sellers collude, bidding on each other's listings for artificial competition.

Red Flags

— New account bids aggressively on one seller only

— Same bidder across multiple listings from same seller

— Bidder has 0 completed purchases — never wins

— Bids only during low-traffic hours

— Round-number algorithmic bidding pattern

— Winning shill bid cancelled, item relisted within days

— Same IP/device for buyer and seller accounts

— Bidder account created same week as listing

— Immediate counter-bid after real bid placed

— Bidder never communicates, never pays

Evidence a marketplace could review

Account relationships

A platform may examine device, network, payment, address, or contact overlap subject to its policy and applicable law. Shared data can have innocent explanations.

Bid concentration

Repeated bidding on one seller, limited purchase history, or frequent nonpayment can support review but is not conclusive alone.

Cancel and relist history

Preserve dates when the same object is repeatedly won, cancelled, and relisted.

Price progression

Record the sequence and timing of bids. Time of day or round numbers alone are weak signals.

Seller communications

Save messages about reserve prices, bidder identities, cancellations, or offers made after an auction.

Buyer response

Set a maximum price from the specimen and evidence, not from other bidders’ behavior. Do not accuse a named person publicly from a pattern alone. Preserve the listing and bid history, then report the concern to the auction operator and follow its published rules. This page does not represent that Jurassic Depot currently operates bid monitoring, account linking, refunds, or enforcement.

Image Defense Layers

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Image Risk Scan

Image checks look for manipulation or fabrication.

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EXIF/C2PA

Metadata verification flags missing camera data.

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Video/Scale Photo

Buyers request dated video or scale photo before bidding.

Defense Guide