SPDR S&P 500 ETF Trust - proxy for S&P 500 index (updates every 15 min)
Why: S&P 500 proxy: the share price of SPY, a fund that tracks the S&P 500 index of large US companies.
Category: macro. Macro economic indicators track monetary policy, liquidity conditions, and traditional market positioning.
Source: Finnhub. Updated: Every 15 min (market hours).
API: GET /api/metrics/etf-spy
Used in briefings: Correlation Check, Market Breadth, Full Context, Factor Attribution, Regime Check
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