Not financial advice

CertusFX is an information tool. Rates, yields and trend outlooks are daily reference values for orientation — not dealing quotes, not a price at which you can transact, and not financial, investment or tax advice.

Data can be delayed, approximate or wrong, and coverage can change without notice. We make no guarantee of accuracy, completeness or availability. Always confirm the actual rate with your bank, payment or exchange provider before moving money.

Data sources & attribution

Spot rates: European Central Bank daily reference rates via the Frankfurter API (free rail), with extended keyed coverage by ExchangeRate-API (Pro rail). Yields: the FRED® API of the Federal Reserve Bank of St. Louis and US Treasury FiscalData.

This product uses the FRED® API but is not endorsed or certified by the Federal Reserve Bank of St. Louis. Trend outlooks are model-generated analysis produced inside the app, not market data from these providers.

Privacy policy (summary)

Your preferences — base currency, language, watchlists and alerts — are stored on your device. Creating an account is optional; if you do, your email is used only for sign-in.

We do not sell personal data. Anonymous, aggregated usage metrics may be collected to improve the app.

Terms of service (summary)

CertusFX is provided "as is", without warranties. Rates, yields and trend outlooks are informational only, may be delayed or approximate, and are not financial advice.

Pro plans are one-time timed passes purchased through your app-store account: a pass simply ends when its term is up, and nothing is charged again. The full terms cover purchases, refunds and disclaimers in detail.

Contact

CertusFX is built by NestCalc. For support, data requests or anything else, email us — we typically reply within 1-2 business days.