How colcur works

colcur is a search engine over certified coin listings on eBay USA — coins graded and sealed in a holder (a “slab”) by PCGS, NGC, ANACS or ICG. Type a coin and a grade, or paste a certification number, and inspect matching live eBay USA listings.

Today's index covers eBay USA. Other eBay markets are not indexed yet; colcur is rolling out market coverage in stages. Get notified when your market goes live.

We read the barcode, not the picture

For each listing, colcur reads the grading service's certification barcode from the slab in the seller's photo. The identity you see — grader, certificate number, grade, date, mint — is that decoded certificate, the same number you can verify on the grading service's own site when a public lookup is available. We do not look at the coin and guess what it is.

We then match the coin to a catalogue so you can climb its identity (series → date → variety), deep-link to Numista for the full details, and compare the same coin across graders — the same date and grade in a PCGS slab versus an NGC slab, side by side.

What we don't do

• We don't authenticate coins or guarantee a slab is genuine — we read the grader's number, the grader vouches for the coin.
• We don't host the seller's photos. To see the coin, we send you to the eBay listing, where the image is current.
• We don't set or guarantee prices. The price shown is eBay's current asking price.

How we make money

colcur is free. When you click through to eBay and buy, eBay pays us a small commission through the eBay Partner Network. It never changes the price you pay, and it never changes which listings we show you.

How we source and keep data

We use eBay's official API — never scraping — refresh prices within hours, keep recently-ended listings for at most 30 days before deleting them, and display no listing photos. For the full detail, see Data & compliance.