Collectors researching a card have to hold a lot in their head at once: what the card last sold for, whether this listing is a good price, how much time is left, and who is selling it. GrailSniper gathers that into one place.

• Auction tracking. Watch specific listings and see them ordered by how soon they end.
• Price comparables. Build a picture of what a card actually sells for from recorded sales, so a listing can be judged against evidence rather than a hunch.
• Seller context.Summarise a seller’s public record — account age, feedback, transaction history — alongside the listing.
• Portfolio records. Track holdings and cost basis, so what you own can be valued against the same comparables.
• Player trends. Rank players by measured signals from public statistics feeds, to show where attention is moving.

GrailSniper does not place bids or purchase anything on your behalf. It is a research and record-keeping tool; buying decisions and the bids themselves are yours to make.

If you choose to link an eBay account, GrailSniper reads public listing information through eBay’s official APIs, using an authorisation you grant on eBay’s own website. You can withdraw that authorisation at any time, from within this application or from your eBay account settings.

We never ask for or receive your eBay password. Linking is done entirely through eBay’s own sign-in, and the access it grants is limited to reading public listing data.

GrailSniper is an independent product. It is not affiliated with, sponsored by, endorsed by, or operated by eBay Inc. or any of its subsidiaries. “eBay” is a trademark of eBay Inc., referred to here only to describe which marketplace this tool reads data from.

GrailSniper is likewise unaffiliated with any card manufacturer, grading company, or sports league, and any names or marks belonging to them are the property of their respective owners.

Accounts are created by the operator and there is no public sign-up. If you have an account, sign in above.

General enquiries: hello@grailsniper.com. Privacy questions: privacy@grailsniper.com.

How we handle data is set out in full in our privacy policy.