The data source

A 1999 Sabrina's Jynx from a Japanese gym deck, graded PSA 8, was resting in a professional vault when it sold for $47.71 in USDC. The trade settled on Polygon in block 93,928,524 (read on-chain, 16 Sep 2026), carrying the seller's address, the buyer's address, the token and the amount, and anyone with a browser can look it up. No price guide was consulted and nothing was estimated. A card sold, and the record of that sale is a public fact.

Quanta indexes are built from real sales like that one.

The board and its history

The Quanta site shows an index board of 44 collectible indexes: PKMN with its vintage, modern and ultra modern segments, Magic, Yu-Gi-Oh!, One Piece and Dragonball Z, the major sports, Star Wars, Marvel and Disney, and indexes cut by era, price tier and population tier. Board levels and their full history come from Card Ladder sales data. Card Ladder tracks sales of graded cards across the major marketplaces and auction houses, which gives every index on the board a sales history reaching back two decades.

The board refreshes daily. Every index is shown in dollars, rebased so that each one starts at $1.00 in May 2004 (a raw level of 1,000 equals $1.00), which puts all 44 on one scale. The board snapshot and the full history of each index are public through the Quanta feed, described in Data and API.

Alongside that history sits the public on-chain record of vaulted card sales. It is the settlement layer the index engine reads, the place where any single price can be traced to the sale that set it. The rest of this page is about that record.

What a sale on the record looks like

When a graded card enters a professional vault, it becomes a token on a public blockchain. The token carries the card's identity: grader, grade, set and card number. When the card sells, the buyer pays in USDC, the token moves to the buyer's address, and the chain writes the price, the block timestamp and both parties into a record nobody can edit afterwards. The physical card stays where it is. These sales settle on Polygon.

Four things hold for every such record. Money changed hands, so the price is a price paid, not a price hoped for. The record is public, so nobody has privileged access to it. It carries a timestamp the network agreed on, so the order of sales is settled. And anyone can check it against the chain and recompute whatever was built on it.

How other prices compare

Most other sources of collectible prices miss at least one of those four.

A listing is an ask: it tells you what a seller hopes to get, and a card can stay listed for months without a single trade. An auction result is a real price but a sparse one, since the same card comes up rarely and each house publishes results in its own format. A price guide's figure is an opinion, sometimes a well informed one, drawn from the sales the guide chose to trust on the schedule it chose to keep.

Completed sales are the common ground of everything Quanta builds. Card Ladder's record of sales across marketplaces and auction houses carries the board, and on-chain settlement carries the sale-by-sale proof. On the chain, the price is the amount that moved, every sale arrives in the same format, and a sale that happened stays on the record for good.

Because the chain writes down every transfer with both wallets attached, it also exposes the trades that are not real prices. Two wallets passing one card back and forth to print a number leave a trail on every pass, and that trail is what lets the methodology remove those sales.

What the record says about each card

Every token resolves to one card at one grade from one grader. The token's identifier is derived from a fingerprint of the physical item: the category, the grader and its certificate number, the card and the grade. Change any of those and the token changes with it, so a token minted for a PSA 9 can never be repointed at a PSA 10. The binding is fixed, which lets the engine treat a token's sale as the sale of a specific, known card.

Here are three sales from that record, chosen for their spread across graders, grades and eras. All three prices are real and can be checked on-chain (settlement prices in USDC, 16 Sep 2026).

Card	Grader and grade	Settlement price	Block
1999 Sabrina's Jynx #124	PSA 8 NM MT	$47.71	93,928,524
2016 Hydreigon Break #043	PSA 10 GEM MINT	$96.44	93,928,503
2024 Mime Jr. #157/091	CGC 10 PRISTINE	$30.46	93,928,505

Two graders, three grades, 25 years between the oldest print and the newest, three real sales. A PSA 8 from 1999 sold for more than a CGC 10 from 2024, and the chain records both with no view on which card is better. Whether any of the three is a constituent is decided by the methodology, not by this page. They are examples of sales on the record, not a statement of what PKMN holds.

How we read it

An indexer follows settlement events on the chain as they are written. The first time it meets a token, it resolves that token to its card, grade and grader and writes the entry into a dictionary. That entry is never rewritten. The dictionary is published, and periodic commitments to it (Merkle roots) let anyone confirm that the copy they hold matches the one we computed from. Every later sale of the token is filed under its constituent, the card, grade and grader triple defined in What is a Quanta index, and from there the methodology takes over: selection, cleaning, scaling, one level.

A copy of the chain and the published dictionary are enough to recheck any sale the engine used. Data and API describes what we publish and where. Each index's specification names the venues it reads and which kinds of on-chain transfer count as a sale for it.

How much of it there is

The largest on-chain vault for graded cards handled more than 50,000 trades on many days in 2026, up from about 10,000 a day in late 2025, and its daily trading volume on Polygon regularly tops $2 million (Privy, Aug 2026). Its public catalog listed about 376,000 items across more than 40 categories, roughly 68% of them Pokémon (venue catalog, 15 Sep 2026). That concentration is why PKMN is the first tradable index.

A sale written to the chain stays readable for good. What the engine does with those sales is the next page, Methodology principles.

Sources for this page are listed in Sources.