Named sources with separate responsibilities

What each source provides

Nasdaq and NYSE publications provide reviewed regular-session calendars. Hyperliquid provides HIP-3 instrument metadata, venue marks, order-book context, and candles.

One source is not used as a substitute for another. Exchange calendars answer a schedule question. Venue APIs describe their own derivatives. Neither venue derivative feed is presented as the official cash-equity tape.

Server-side collection

Server-side services request a bounded registry of reviewed symbols. They verify the returned instrument identity and required fields before a normalized result is rendered. Repeated requests may use a stored snapshot or a short-lived server cache.

The visitor’s browser does not open a direct venue connection for the displayed quote. Server-side caching, timeouts, and rate controls bound upstream demand and allow a source failure to return an unavailable state instead of blocking the page indefinitely.

Instrument mapping registry

Each asset entry records the official ticker, exchange, currency, security type, and the exact symbol used by each supported venue. A symbol appearing in an API response is not enough: the reference definition and off-hours behavior also require review.

A delisting, contract migration, ticker change, split, ADS-ratio change, or reference-method update can invalidate a mapping. When that happens, the affected price and chart are withheld until the entry is reviewed again.

Failure handling

Sources fail independently. A Hyperliquid error must not be filled with data from anywhere else. The interface exposes live, delayed, unavailable, halted, and mapping-invalid states instead of hiding them behind a generic quote.

The collector uses bounded retries, validates time and numeric fields, and keeps a last verified value only when its origin and age remain clear. Bad data is withheld before it reaches a ranking or chart.

Refresh and stored history

Page copy describes values as observed or delayed rather than promising exchange-grade real time. Every displayed quote includes a UTC timestamp, and stored candles retain the exact venue and instrument that produced them.

Longer chart ranges require the site to accumulate its own reviewed history or license an appropriate archive. We do not manufacture missing bars or merge similar-looking instruments to make a chart appear complete.

Display rights and attribution

Technical availability, permission, attribution, caching limits, and commercial use are separate questions. We review each provider’s terms, allowed fields, retention, attribution, rate limits, and review date before deciding what coverage to show.

A public endpoint or technical document does not by itself grant display, caching, historical-storage, or commercial-use rights. Coverage can be limited or removed when the applicable rights or attribution requirements are unclear.

Primary source documentation

• Nasdaq market calendarRegular hours, holidays, and early closes.
• NYSE hours and calendarsNYSE market hours and holiday calendar.
• Hyperliquid API documentationPublic info endpoint and candle requests.