Data sources
Central-bank gold figures on Bullion API come from the publishers below. Each is credited here as its reuse terms require. The full conditions are in the data licensing terms.
National Bank of Ukraine
The NBU permits commercial reuse of its open data with attribution to the National Bank of Ukraine.
Prior approval is required before modifying or editing NBU source data; Bullion API preserves the reported valuation in millions of US dollars and derives no quantities or changes.
European Central Bank and ESCB
The ECB permits commercial and non-commercial reuse when statistics and metadata are unchanged; quote the source, for example “Source: ECB statistics.”
Identify any changes; Bullion API applies the published unit multiplier, normalizes ounces, and converts reported weight to tonnes.
Banco Central do Brasil
The Banco Central do Brasil publishes this series under the Open Database License (ODbL) 1.0: attribute the Banco Central do Brasil, and offer any adapted database you make public under the ODbL (share-alike).
Identify any changes; Bullion API stores the published values in millions of US dollars and derives the change from the previous observation.