Invesco QQQ Trust - proxy for Nasdaq 100 index (15-min delayed)
Why: Nasdaq 100 proxy. Tech-heavy index most correlated with Bitcoin during risk-on periods.
Category: macro. Macro economic indicators track monetary policy, liquidity conditions, and traditional market positioning. Changes in these metrics often lead Bitcoin price moves by days or weeks.
Source: Finnhub. Updated: 15-min delayed (market hours).
API: GET /api/metrics/etf-qqq