The verifiable card-price authority.

Renaiss OS Index is a public reference-price site for collectible trading cards. For every card and grade we track, we publish a reference price — computed as the mean, median and volume-weighted average of recent sales — alongside the complete trade history those numbers are derived from. We also publish daily market indices: normalized baskets of the top-traded cards, rebalanced every day.

Every reference price is built from real, recorded sales across three named source types: public marketplaces, partner shops that share their sales with us, and Renaiss-owned transactions. We do not invent or model prices in a vacuum — each data point is an actual trade, and on every card page each trade links back to its original source so you can verify it yourself.

Transparency is the whole point. The reference price, the method behind it, the underlying trades, and their sources are all shown together — nothing hidden. Our methodology documents exactly how each price and index value is calculated. If a trade looks wrong, every page carries a one-click way to flag it, and corrections are applied at the source.

Spotted a bad data point or want to become a data partner? Use the “Report a data issue” link on any card page, or visit Partners to share your shop’s sales and help make the reference more complete.