Legal

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.

Spot rates: European Central Bank daily reference rates via the Frankfurter API (the free converter), with extended keyed coverage by ExchangeRate-API (the full app). 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.

Your preferences — base currency, language, watchlists and alerts — are stored on your device. Creating an account is optional; if you do, we store your email, an encrypted password, and what gives you access: when your free trial started, your lifetime unlock or early-user date, and any pass with its expiry date. Without an account, a trial or early-user record from the app is kept against the app’s anonymous purchase identifier, never against personal data. If you buy, we keep a record of the purchase; your full card number goes only to the app store or to Stripe, never to us.

We do not sell personal data and we run no advertising or tracking cookies. Our hosting layer keeps minimal technical logs — request paths, device type and timestamps, plus your account ID and transaction references for purchases and refunds — to diagnose problems. Web purchases are sold by Link (Stripe) as merchant of record, and account emails are delivered by Brevo. The iOS and Android apps also send crash reports and basic usage statistics to Google Firebase, never with your name, email or account ID.

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.

The converter is free. Every other feature is free to try for 14 days, then unlocked for good by one lifetime purchase, bought here on the web from Link (Stripe), the merchant of record, or in the mobile app through your app store: one payment, and nothing is charged again. The full terms cover purchases, the trial, refunds and disclaimers in detail.

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