mark_price and mid_price represent implied probability in [0, 1], not USD.
Stored HIP-4 market-data coverage for native order books, trades, open interest, and L4 begins May 2, 2026 across current symbol rows. Outcome discovery and settlement metadata are separate route contracts: the outcomes response exposes is_settled. The candles route provides a probability-history series without a per-schema floor in the current coverage response. Use the selected outcome side’s coverage metadata for the exact window rather than inferring a venue-wide history.
HIP-4 REST
Outcome-market route family.
Response schemas
Shared field rules and envelope behavior.
Route Scope
The current contract keeps outcome-market routes under/v1/hyperliquid/hip4/*:
There is no HIP-4 funding or liquidation route. A listed route does not establish non-empty coverage for every outcome; use coverage and freshness for the selected identifier before relying on its window.
Implementation Pattern
For probability-history analysis, an outcome-liquidity monitor, or an outcome-market dashboard, start by discovering the question or outcome side, then pull one small order-book, trade, or candle request. If the output feeds a model, alert, or backtest, check data-quality routes and label price fields as probabilities. Preserve the# identifier or URL-encoded form in requests and storage.