Use when you need historical exchange rates, a historical FX rate series, forex history or a currency trend. Do not use for rates older than 90 days, live quotes or crypto (one ECB rate per business day). Returns JSON with historical exchange rates: 90 days of daily ECB euro reference rates (free at ecb.europa.eu) for up to 10 currencies, rebased to any base as cross rates, with min, max and percent change for 0.005 USDC per call. Typical response time 1500 ms (p95). Category: Data.

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