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About Gemby

Gemby is a sports card opportunity monitor. It continuously scans eBay, scores listings against real market comps and seller signals, and alerts you to the opportunities worth grabbing.

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Up to 60s on paid plans

Sports card opportunity monitor

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© 2026 Gemby. All rights are reserved. gemby.co helps collectors monitor marketplace listings, compare signals, and discover card opportunities faster.

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Rotate to portrait Gemby works in portrait mode.

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Searching the depths of eBay for gems Gemby is checking seller trust, listing photos, and card signals.