Cena spot
Price per troy ounce of gold (XAU), silver (XAG) and platinum (XPT) in euros from gold-api.com: free endpoint /price/{symbol}/EUR. The three symbols appear in its public list /symbols, and its terms (read 09/11/2026) say that “Commercial use of the API is always permitted, including use in web applications […] and third-party websites”. gold-api.com does not guarantee accuracy: figures are indicative.
- Currency check. We only accept a response if it shows
currency: "EUR", the requested symbol, a positive exchange rate and a plausible price. If a currency the API does not know is requested, it returns an error instead of dollars. In our check on 09/11/2026, the euro price matched the dollar price × the rate the API itself reported, and that rate differed by less than 0.1% from the ECB reference rate. - Each metal separately. If one fails, the others still show.
- Fallback. If a metal’s euro price fails, we use its dollar price from the same source × the European Central Bank reference rate published by Frankfurter (its site states the API is free for commercial use too and that v1 data come from the ECB). The ECB publishes that rate once per business day, so the fallback conversion may be one or more days old; we say so.
- Site proxy. The browser first requests
/api/spoton this same domain. The server queries gold-api.com (and Frankfurter if needed), caches the response for about 5 minutes and serves it to all visitors, so the source is not called once per person. - Cache. If the proxy and the APIs fail, we show the last figure for that metal stored in your browser, marked as outdated, or “—” if there is none.
- Freshness. The page refreshes every 60 s (usually getting the proxy’s cached response). If the data are more than 15 minutes old we mark them as “delayed”.
- No 24 h change. The free source does not provide it and we do not invent it.
Waluty wyświetlania
Amounts can be shown in several currencies besides the euro. Exchange rates for the US dollar, pound sterling, Swiss franc, zloty, Nordic and Czech crowns, forint, leu, Canadian dollar, Mexican peso, Brazilian real, yuan, shekel, yen and rupee come from the ECB reference rate published by Frankfurter (EUR base). The dirham ZEA (AED) is not published by the ECB: we calculate it as USD × 3.6725, the official dirham-per-dollar rate under the peg of the UAE Central Bank. It is an indicative conversion; it is not an ECB rate.
Wartość przetopowa
Fine weight (g) = weight × fineness. Value = fine weight × (price per ounce ÷ 31.1034768).
If the legal text states the fine content (e.g. “contains one troy ounce of fine gold”), we use that figure. If it gives weight and fineness, we multiply and note it on the card. If the law sets a minimum fineness (“at least 925 thousandths”), the result is the legal minimum.
Specyfikacje: tylko oficjalne teksty z licencją ponownego użycia
Since 09/11/2026 we only publish coins whose weight and fineness we have read in official normative texts, via their public websites, and whose reuse terms expressly allow it:
- 11 cards · BOE (including the 1868 Gaceta de Madrid hosted on boe.es). The BOE reuse terms allow commercial and non-commercial reuse, including extraction, provided the source is cited. Based on data from the Agencia Estatal Boletín Oficial del Estado. This site is not official and is not sponsored by the BOE.
- 2 cards · legislation.gov.uk (Coinage Act 1971). Contains public sector information licensed under the Open Government Licence v3.0.
- 5 cards · United States Code (31 U.S.C. §5112, govinfo.gov). Works of the U.S. Government are not subject to copyright in the United States (17 U.S.C. §105). We have not analysed their protection in other countries.
From each text we extract only minimal technical data (weight, fineness and fine content), with a short quote as evidence. We do not reproduce full texts or images. Each card states the source, licence, quote, access date and how each figure was obtained.
What we removed. Cards based on third-party catalogues (Numista) and on mint websites whose terms allow only personal non-commercial use, or whose reuse terms we could not verify, are no longer published. That is why the catalogue is much smaller than before and omits many common coins. Neither the legal texts nor the terms of use have been reviewed by a lawyer.
Użyte teksty oficjalne
- Ley 12/1966, de 18 de marzo, BOE núm. 67, 19/03/1966
- Orden de 8 de julio de 1994, BOE núm. 166, 13/07/1994
- Orden de 17 de marzo de 1994, BOE núm. 73, 26/03/1994
- Orden ECO/84/2002, de 10 de enero, BOE núm. 21, 24/01/2002
- Orden ECO/319/2003, de 10 de febrero, BOE núm. 44, 20/02/2003
- Decreto de 19 de octubre de 1868 (Ministerio de Hacienda), Gaceta de Madrid núm. 294, 20/10/1868, págs. 7–8
- 31 U.S.C. §5112 (United States Code, edición 2023, govinfo.gov) (a)(10)
- 31 U.S.C. §5112 (United States Code, edición 2023, govinfo.gov) (e)
- 31 U.S.C. §5112 (United States Code, edición 2023, govinfo.gov) (a)(8)
- 31 U.S.C. §5112 (United States Code, edición 2023, govinfo.gov) (a)(9)
- 31 U.S.C. §5112 (United States Code, edición 2023, govinfo.gov) (a)(7)
- Coinage Act 1971, Schedule 1, Part I (versión original, «as enacted»)
Typografia
Fraunces and Inter, served from this same site under the SIL Open Font License 1.1 (no third-party font services).
Ostatnia aktualizacja: 09/11/2026.