METHODOLOGY
Data sources and methodology
This page explains where displayed information comes from and how it is transformed. If a method changes, we update both the relevant explanation and the review date.
1. FX source and units
Exchange rates come from the European Central Bank's reference rates, retrieved through Frankfurter with the ECB provider filter. ECB reference rates are daily information values, not executable trading quotes.
We derive KRW per unit of foreign currency from currencies quoted on the same ECB reference date. JPY is multiplied by 100 for a common Korean-market display convention. Rounding affects presentation only; chart calculations use the underlying numeric values.
2. Last update and next update
“Last update” is the reference date of the displayed data. “Next update” means after the ECB's next business-day reference-rate release. Weekends, European holidays and upstream delays can leave the previous business day's value in place.
3. Caching and outages
To avoid unnecessary requests, the browser stores a recent response for up to six hours. If the network fails, a stored copy no more than 14 days old may be shown with a clear “saved data” label. If no copy exists, the site reports an outage rather than inventing a number.
4. Metal-market categories
Gold and silver have widely used LBMA benchmarks, while platinum and palladium have LPPM benchmarks. For rhodium, iridium and ruthenium, supplier base prices and bilateral quotes are generally more relevant than a continuous exchange price. Osmium varies substantially by form and specialist distribution channel, so we do not describe it as having one universal spot benchmark.
The site does not use a metal-price service that requires payment, API-key registration or individual approval. We have not identified a public API that meets those conditions while also providing verifiable units, provenance and commercial-use rights for all eight metals, so metal price figures and price charts are not published.
5. External API and licence in use
The only runtime external request is the Frankfurter FX API. Its public API requires no key and permits commercial use, while its server source is published under the MIT licence. We lock requests to providers=ECB so the underlying source is explicit.
ECB information may be reused free of charge when it is reproduced accurately and the ECB is cited. This site clearly states that it transforms the ECB's euro reference rates into derived KRW cross-rates.
6. Long-range FX charts and corrections
Seven-day and one-month views use daily FX observations. One-year and five-year views use monthly observations for readability and transfer efficiency. To report a discrepancy, use the contact page and include the currency, reference date and official source you compared.
Reference rates and market explanations are for education and comparison. They do not replace bank customer rates, exchange executions or dealer bids and offers.