ECB FX Rate Historical Series

Choose this endpoint when you need a time-series of ECB official reference rates for a specific currency pair over a date range, with aggregated statistics. Prefer it over single-rate lookups when you need trend analysis, volatility stats, or charting data. It complements the single-date cross-rate endpoint when historical depth or interval aggregation is required.

• Unsupported currency pair (not covered by ECB fixings) returns an error or empty points array
• Invalid date range (e.g. before 1999 or future dates) may return empty or partial results
• Malformed interval value (not daily/weekly/monthly) causes a validation error
• Network or payment authorization failure returns a 402 or 5xx error