United States M2 broad money supply, M2SL series (monthly from FRED)
Why: Broad money supply. M2 growth historically correlates with Bitcoin price on 6-12 month lag.
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: FRED (Federal Reserve). Updated: Hourly.
API: GET /api/metrics/m2-supply