Question 1

What is a proxy bid?

Accepted Answer

When you enter a max bid on eBay or a similar second-price auction, the platform does not actually bid your full amount right away. Instead, the platform acts as your proxy — it bids only enough to stay ahead of the next-highest bidder, one increment at a time. If nobody bids above you, you win at the smallest amount above the second-highest max. This is why entering $500 on a lot sitting at $50 does not jump the price to $500 — the system only raises by one increment when someone else bids.

Question 2

What is the eBay bid increment ladder?

Accepted Answer

eBay bid increments are tiered by current price. $0.01–$0.99 uses $0.05 increments. $1.00–$4.99 uses $0.25. $5–$24.99 uses $0.50. $25–$99.99 uses $1. $100–$249.99 uses $2.50. $250–$499.99 uses $5. $500–$999.99 uses $10. $1,000–$2,499.99 uses $25. $2,500–$4,999.99 uses $50. $5,000+ uses $100. When you are the high bidder at the $247 mark and a rival outbids, the system jumps by $5 to $252 (not the $7 you might intuit). Knowing the ladder lets you pick a max bid that sits just above a rival’s likely round-number target.

Question 3

How does second-price auction clearing work in practice?

Accepted Answer

You bid $500 max. Your one rival bids $350 max. You win at the next increment above $350 — on eBay that is $355 ($5 increment at the $250–$500 band). You do NOT pay $500 unless a second rival also happens to bid above $495. The tool models this: enter your max + the highest rival max, and it shows your expected clearing price, which is almost always far below your max. This is why bidding your true maximum on a sniped auction is rational — you only pay what the competition forces.

Question 4

Why do odd-dollar deterrent bids matter?

Accepted Answer

Human bidders gravitate to round numbers — $100, $250, $500, $1,000. A casual rival picks $500 as their max because it feels like a limit. If you bid $503, you beat that rival by exactly $3 when the auction clears. Across many auctions that 1–3% delta compounds into real savings. The tool suggests an optimal deterrent bid just above nearby round-number anchors — typically $503, $1,003, $2,513 — rather than the default $500 your rival intuits you at.

Question 5

Should I snipe or bid early?

Accepted Answer

Both strategies have tradeoffs. Early bidding signals strength and can deter casuals but gives professionals time to raise. Sniping (bidding in the last 10 seconds) prevents emotional rivals from re-bidding against you, but requires execution and gives you one chance to be right. Tool’s guidance: snipe when your rivals are likely emotional bidders (rare grails, heated nostalgia cards). Bid early when rivals are sophisticated and will raise anyway (modern high-series, numbered parallels tracked by flippers). Never bid in the $10–$60s-to-go window — that is the worst of both worlds (wakes up rivals without preventing their last-second counter).

Question 6

How does the tool handle multiple rivals?

Accepted Answer

With one rival you pay one increment above their max. With two or more rivals, the clearing price is one increment above the second-highest MAX across the entire field (not the sum, not the average — just the #2 max). Adding more rivals only matters if at least one of them bids above your current top rival. The tool lets you enter up to 4 rival max bids and shows how the clearing price moves as you add bidders or raise their maxes.

Current price band	Increment	What it means
$0.01 – $0.99	$0.05	20-cent penny auctions are where flipper wars begin
$1 – $4.99	$0.25	Common-card lots
$5 – $24.99	$0.50	Star raws, low-end graded
$25 – $99.99	$1.00	Mid-tier modern slabs
$100 – $249.99	$2.50	Solid RC Chrome 9s
$250 – $499.99	$5.00	Key modern RC 10s
$500 – $999.99	$10.00	Elite modern, vintage commons 9
$1,000 – $2,499.99	$25.00	Vintage stars, prospect autos
$2,500 – $4,999.99	$50.00	Elite vintage RCs 8-9
$5,000+	$100.00	Grails and trophy cards

Proxy Bid Optimizer

The eBay Bid Increment Ladder

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