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 come from your selected source (ECB Frankfurter or Open ER API). If a live fetch fails, the app uses the last cached rate and shows its timestamp.
- Direct pairs convert as amount × rate. When a direct quote is not available, a cross via a reference currency (for example EUR) is used to preserve consistency.
- No spreads or fees are applied here; this is mid‑market pricing for educational use. Your bank/card may differ.
- The shareable URL captures the amount, currencies, source, and history window so you can reproduce the same result later.
Exchange rates change rapidly. Always double-check critical transactions with your bank or card issuer. This calculator is provided for informational purposes only.