Euro to US Dollar foreign exchange rate, DEXUSEU series (daily from FRED)
Why: EUR/USD reflects relative monetary policy between ECB and Fed. Euro strength = dollar weakness = generally supportive for Bitcoin.
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/eur-usd