Methodology and data sources

This page explains where the displayed values come from, how Gold Update processes them and what their limitations are. All values are provided for information only. Last updated: 29 July 2026.

Open pointOpen licensing point: Gold API’s published terms permit use of the API but do not expressly address permanent storage, publication of an independently maintained historical series, commercial monetisation or derived datasets. Before introducing advertising, affiliate use or any other commercial exploitation, Gold Update must obtain written permission from Gold API.

Current gold prices

Gold Update retrieves XAU/USD and XAU/EUR from Gold API on the server. Additional currencies are calculated from the USD value and ECB reference rates obtained server-side through Frankfurter. The regular retrieval interval is ten minutes. The visitor’s browser connects neither to Gold API nor to Frankfurter. The values are indicative references, not real-time quotes or tradable bids or offers.

Storage and plausibility checks

Each valid current value is stored in a ten-minute UTC interval in Gold Update’s Cloudflare database. Repeated retrievals update the same interval and do not create duplicates. Deviations exceeding the configured threshold are marked and are not returned as the latest plausible value. Ten-minute raw values are currently deleted after 90 days; hourly and daily aggregates and imported daily values remain stored for the displayed series.

Historical data

Gold Update creates hourly and daily values from its own ten-minute observations. Open, high, low and close are the first, highest, lowest and last valid observations of the relevant UTC period; average is the arithmetic mean. A protected one-off import can also retrieve daily USD averages from Gold API for a maximum of 15 years. The public chart reads exclusively from Gold Update’s Cloudflare database. This technical storage does not replace the need to clarify the necessary usage rights with Gold API in writing.

Currencies and data gaps

Historical EUR and other currency values are calculated for each date from the USD daily value and the latest ECB reference rate available for that date; today’s exchange rate is never applied retrospectively. On weekends and public holidays, the latest rate may be carried forward for no more than seven days. If no such rate exists, the point is omitted. Larger gaps are not filled with invented values.

Inflation comparison

The gold-versus-inflation calculator retrieves Eurostat’s monthly all-items Harmonised Index of Consumer Prices on the server (dataset prc_hicp_midx, unit I15 with 2015=100). It uses series DE for Germany and EA20 for the euro area. Only months with both an official index and a stored gold observation are compared; missing months are not interpolated. Because official indices are published with a delay, the common chart ends at the latest documented month and shows any newer nominal gold value separately.

Units and calculators

One troy ounce equals 31.1034768 grams. The calculated metal value is based on fine-gold weight and the stored reference price. Premiums, spreads, inspection, delivery, tax and custody costs are included only where they are shown separately.

Sources and limitations

Gold price source: Gold API. Exchange rates: ECB via Frankfurter. Inflation: Eurostat, prc_hicp_midx. Additional currencies and time series are calculated by Gold Update. All values are indicative. Gold API gives no warranty of accuracy, completeness or availability. Frankfurter permits commercial API use and refers users to the terms of each underlying provider. ECB reference rates are intended for information only and are expressly discouraged for transaction purposes. Gold Update does not publish LBMA benchmark data.