Rate History
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Why traders use this tool
- Compare ECB mid-market rates with Open ER API to spot anomalies.
- Share the converted result via URL or save it to your CalcBE.com favorites.
- Keep working even when offline thanks to cached quotes with timestamp labels.
FAQ
Where do the exchange rates come from?
You can switch between the European Central Bank’s Frankfurter API and the free Open ER API (open.er-api.com). Both provide HTTPS endpoints with mid-market data. Note that your bank or payment processor may apply its own spread or fees.
What happens if the app is offline or the API fails?
The most recent successful rate is cached locally along with its timestamp. If a live call fails, the cached value is shown and flagged. For mission-critical payments, verify the latest rate with your financial institution.
Why do rates differ from my bank?
We use mid‑market data; your bank may apply a spread or fees. Treat the output as a reference and check your provider’s final rate for transactions.
How often are rates updated?
ECB publishes once daily on business days; Open ER API updates more frequently. The app shows the last successful fetch until a fresh rate is retrieved.
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How it's calculated
- Rates pulled from selected source (ECB Frankfurter / Open ER). Cache used on failure with timestamp.
- Direct pairs: amount × rate. If unavailable, cross via a reference currency (e.g., EUR).
- No fees/spreads applied (mid‑market for education). Verify with your institution for actual rates.
- Share URL stores amount, currencies, source, and range for reproducibility.
Exchange rates change rapidly. Always double-check critical transactions with your bank or card issuer. This calculator is provided for informational purposes only.
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