How to Find Undervalued PSA Slabs Using the Mintlytics eBay Sniper

The problem with manual eBay hunting

eBay's search is built for sellers, not buyers. Filters are clunky, sort orders rarely surface real deals, and the listings that do qualify as bargains often vanish in minutes — bought by sellers running their own scripts. Manual hunting at any meaningful scale is a losing strategy.

The Mintlytics eBay Sniper is built around one idea: you tell us which cards you want and at what margin; we watch the tape.

Step 1 — Add cards to your sniper list

Open the eBay Sniper page, hit "Add card", and pick the card you're hunting. You can target a specific grade (PSA 10, PSA 9, BGS 9.5, raw) or leave grade open if you want any clean copy. Pro tier supports up to 20 cards on the watchlist; Elite is unlimited.

Step 2 — Set your target margin

Margin is the discount-to-fair-value threshold below which we'll fire an alert. Defaults to 15%. The math:

Profit = Market Value − Listed Price − Estimated Fees Margin % = Profit / Market Value

Tighter margins (20%+) mean fewer but better deals. Looser margins (10%) mean more volume but more borderline opportunities. Most users start at 15% and tighten as they learn what's normal for their target cards.

Step 3 — Optional max price cap

If you only want to hear about a card under a specific dollar figure, set a max bid. The scanner won't notify you on listings above it, even if they technically clear your margin.

Step 4 — Get notified

The scanner runs every 30 minutes against eBay's Browse API. When a listing hits your criteria, you get an in-app notification and an email — usually within a minute of the listing going live.

Three power-user tips

1. Start with cards you already understand. The deal feed is most useful when you have an opinion about fair value. Don't snipe a card you've never tracked before.
2. Watch auctions, not just BIN. Auctions ending overnight in low-traffic time zones routinely close 20–30% under fair value.
3. Stack with price alerts. Pair the sniper with a 10% price drop alert on the same card. The two together catch both eBay-specific dislocations and broader market drops.

When deals appear

Your deal feed shows the listing image, current price, fair value (we calculate this), profit estimate, time remaining, and a one-click link to the eBay listing. Acting fast matters — the best deals get sniped by other users on Mintlytics within minutes.

This feature is included on Pro and Elite tiers. Free tier sees the deal feed in a delayed, view-only mode.