The feeds are the bell
Chainlink updates a stock feed when its price moves. Robinhood's stock tokens trade around the clock on weekdays, so the eighteen feeds tick all week and go completely silent from Saturday to Monday, and on the holidays the market takes. Count the ones that moved recently and you know whether the market is on, with no calendar to maintain and nobody to trust.
Fixed at deployment, immutable after
Measured over five weekly opens
Median, 19m at worst
Read it from a contract
A view call over eighteen feeds. Nothing is stored, nothing is charged, and there is no owner who could change the answer.
bool live = hours.isOpen();
hours.requireOpen(); // reverts when shut
Ring the bell
The reading is live, but somebody has to write it down. Anyone can ring: the contract compares the feeds with its log and records the start or the end of a trading week, stamped with the tick itself rather than the hour the call was made.
Proof
Everything below is read from the contract on Robinhood Chain as the page loads. Nothing here is typed in by hand.
No admin, no pause, no upgrade. The rule is immutable, set once at deployment
window() and quorum() are constants in the bytecode
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Thirty days of real Chainlink updates, 99.6% match with the trading week
See every rule that was triedWhat the feeds did today
The last twenty-four hours across all eighteen, an hour to a bar. The tape has every round, with the day picker.
Reading the rounds…
