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CYKI 100 and brand indices

Index rulebook

Who publishes the index, how it is built, and what happens when it is wrong. The constituents are private. The rules are not.

Rulebook version
v1.0 · effective 9 Oct 2026

2. Methodology in brief

  • The CYKI 100 tracks the resale market for sneakers. It was set to 100 on 27 Jun 2026. Each brand index is set to 100 on its own base date, shown beside it.
  • Prices are lowest asks and banked sales from third-party data. They are observations, not offers or valuations.
  • The indices are equal-weighted and chain-linked. Each constituent is tracked at one reference size.
  • The level updates once a day, after the US price update from the data provider. It is a daily close, not a live price.
  • Every change shown anywhere on this site carries the date it is measured from.
What is public and what is not
Published: index levels, performance, brand labels, and these rules. Not published: the list of constituents, how many there are, and their identifiers. Trust comes from the rules and the change log, not from the member list.
Full methodology page

3. Corrections

Material error0.05 points or more on a published daily change, a sign flip, or 0.10 points or more on a published level
Correction window30 days from discovery, with a public change-log entry
  • No provider update: the day is published as a void day and is never back-filled.
  • A material calculation error (above): corrected within 30 days. The correction publishes as a new version of that close and gets one change-log entry saying what changed and why. The earlier version stays readable at its own page with a corrected-on banner.
  • Smaller errors stand and are not logged.
  • Social posts already sent are not recalled. The site and this log are the record.
  • Report an error to sole@canyoukicksit.com.

4. Void days

Some days the price provider does not publish a US update. On those days CYKI publishes no daily change. The page says “No update today” and never shows a zero move. The CYKI 100 stays at its last level. The next real close shows its change since the last real close, never “on the day” across a gap.

DateWhat happenedOutcome
No void days recorded yet.

5. Change log

LoggedTypeChangeHistory restated
No corrections or void days recorded yet.

Newest first. This log lists corrections and void days.

Index levels are descriptive. Not investment advice. The CYKI 100 and the brand indices are CYKI measures and are not offers, valuations or products.