Card. The belief: “crypto trades around the clock, so the hour doesn't matter.” On a basket of coins, the 4-hour stretch around the US stock market open gets 1.93 times as many big price swings as usual. It says when prices move, not which way.
Sep 18, 2026 · myth check · crypto

Crypto never closes. It still keeps hours

A popular belief: “crypto trades around the clock, so the hour doesn't matter.”

The data: the price history of a basket of coins, cut into 4-hour stretches. The stretch around the US stock market open, from 12:00 UTC, gets 1.93 times as many big price swings as an average stretch. It held in both halves of the history.

This says when prices move, not which way.

When a big move comes at the US open, how much of it is news, and how much is the clock?

Where each number comes from

Receipts

Every number above was read by code from a line of a versioned measurement file. The version and the hash pin the exact text it came from. Data as of Sep 18, 2026 · 04:40 UTC.

NumbersMeasurementLineVersionSHA-256
12:00, 1.93Base rates (crypto)line 166952ea80427d058e3d24

Caveats

  • A measured frequency describes the history it was measured on. It is not a forecast.

No disclaimer was needed: the note gives no price levels, forecasts, direction, calls to action or trade results.