Perp funding-rate HISTORY, deterministic and lookahead-safe. Answers "what was funding for this coin over the last N days", "backtest my strategy against real funding". Hourly Hyperliquid funding rows for up to 90 days per call (windows anchor anywhere in a year+ of history): settlement time, hourly rate, annualized percent, premium, and an available_at timestamp per row so recorded history is point-in-time honest. Summary stats included. Keyless public data, no LLM.