Collection pages

For: collectors comparing sets. Goal: read a collection without over-reading its numbers. Prerequisites: none. Chain and network: Bitcoin mainnet. Safety: reading only.

Where they are

stampdex.fun/stamps/collections lists them. A single collection is at /stamps/collection/<id>.

Collections, image first. A collection nobody has listed shows a dash where a floor would be. Captured from production, 2026-08-28.

What a collection actually is

Curated metadata that groups stamps. Membership is not a chain fact. It comes from the collection index, so StampDEX names the source of collection data on the page. Two indexes could disagree about what belongs in a set; neither would be lying about Bitcoin.

The stamps themselves are chain facts. The grouping is not.

The figures

Figure	How it is computed	When it is unknown
Floor	The lowest reported floor across the collection’s stamps	When no stamp in it has a reported floor
Volume	Traded value over the window	When no source answered
Market cap	Floor times the edition count	When there is no floor
Listed market cap	Floor times the listed supply	When there is no floor
Listed	How many are for sale now	When the listing source did not answer
Holders	Distinct owning addresses	When the source did not answer

An aggregate floor across collections is a minimum over the collections that reported a positive floor, never a zero standing in for silence. An aggregate volume is never a sum that quietly treats an unknown as nothing: the response carries a coverage count saying how many collections reported.

Reading a collection honestly

• A collection with no floor shows a dash, not a floor of 0. There is nothing for sale.
• A high market cap on a thin collection is floor times supply, and the floor may be a single listing. It is arithmetic, not liquidity.
• Trait and rarity data, where present, comes from the same third-party collection index as membership.

How to verify

curl "https://stamp.api.bitcoinuniverse.io/api/v1/collections?includeMarketData=true&limit=3"

Per-collection market data is attached only when you ask for it, and it is cached server side.

Common failure states

You see	Cause	Recovery
A collection page with no stamps	The collection index did not answer	Retry. The stamps still exist on chain
A dash where you expected a floor	Nothing in the collection is listed	Nothing to fix. That is the honest answer
Thumbnails missing	The media source could not serve those bytes	The raw bytes are still on chain; the stamp page links the transaction

Related

• Bitcoin Stamps
• Data provenance
• Stamps endpoints