Data sources & methodology

We prefer transparent data over false precision. Here's what each number means.

Market data by provider

Our seven original reference markets are sourced from Gold API. Daily Brent, WTI and Henry Hub spot prices come from the U.S. Energy Information Administration (EIA). Aluminum, nickel, zinc, tin, lead and iron ore use World Bank Pink Sheet monthly averages (CC BY 4.0). Additional cryptocurrency prices can be provided by CoinMarketCap API under its applicable commercial API terms, or by another authorized feed. Quotes are not shown when the provider is unavailable.

Quote units

Gold, silver, platinum and palladium are priced per troy ounce (31.1034768 grams). Copper HG is per pound. Other industrial metals and iron ore are per metric tonne; oil is per barrel, and Henry Hub natural gas is per MMBtu. Cryptoassets are per coin or token.

Currency and charts

Current prices can be quoted in several currencies through the provider. Historical charts deliberately use USD reference observations, regardless of the selected current-price currency. Choose grams, kilograms or the benchmark unit to rescale current prices and historical chart values. This avoids representing today's currency conversion rate as a historical exchange rate.

Historical availability

Gold API historical observations can be backfilled with server-side authentication; EIA publishes daily values, and World Bank publishes monthly averages. Charts never manufacture or interpolate missing history. A daily or monthly series cannot provide true intraday fluctuations.

Price changes

A percentage change is only shown where a valid comparable historical observation exists. The nearest eligible observation is chosen using its original timestamp. No change figure is inferred from an unrelated reference period.

Risk

Data can be delayed, inaccurate, unavailable or interrupted. Quotes are for information only and are not executable prices, investment advice or a warranty of accuracy.