Methodology
How Open Market Rank works
Open Market Rank ranks three different kinds of markets using three different size measures. It does not combine them into a single universal ranking.
The 60-second version
Countries
Countries are ranked by nominal GDP in current US dollars. National wealth is available as a separate secondary measure because economic output and accumulated wealth are different concepts.
Currencies
Currencies are ranked by broad money supply (M2). Values are converted to US dollars so different currencies can be compared on a consistent scale.
Cryptocurrencies
Cryptocurrencies are ranked by market capitalization, calculated from market price and circulating supply as provided by the market-data source.
Dates
The reporting date of an underlying observation and the time Open Market Rank refreshed the site are recorded separately wherever possible.
Sources
Open Market Rank identifies the external source used for each data category and keeps permanent snapshots for reproducibility.
Detailed methodology
Why there is no universal ranking
GDP, national wealth, money supply and cryptocurrency market capitalization measure different things. Putting them into one ranking would create a visually simple list but a conceptually misleading comparison. Each class is therefore ranked on its own measure, and the market size overview is used only to show broad scale across classes.
Country rankings
The primary country ranking uses nominal gross domestic product in current US dollars. GDP describes economic output during a period, usually one year.
National wealth is presented separately. Wealth estimates the value of accumulated assets minus liabilities at a point in time, so a country can have a high GDP rank and a different national-wealth rank. Reporting years may differ because source institutions publish country observations on different schedules.
Currency rankings
The currency ranking uses broad money supply, generally M2 or the closest source-defined comparable measure. Local-currency observations are converted into US dollars for ranking purposes.
Money-supply data and exchange rates can carry different timestamps, so the reporting period of the money observation is shown separately from the exchange-rate refresh.
Cryptocurrency rankings
Cryptocurrencies are ranked by market capitalization: price multiplied by circulating supply as supplied or derived from the market-data provider. Because crypto market data changes continuously, these rankings move much more often than country or money-supply rankings.
Missing data
Open Market Rank does not invent values. When a source does not provide a usable value, the interface marks the field as Not available or, for supported datasets, temporarily retains the latest previously available observation.
Previous values
When a refresh cannot produce a usable replacement for a previously published value, the latest available value may be retained rather than the record removed. These cases are identified as Previous value used and are not newly reported source data.
Permanent snapshots
Each published snapshot preserves a specific state of the dataset. Historical snapshots are not rewritten when later data arrives, which is what makes a citation reproducible.
Limitations
Financial and economic datasets are not perfectly synchronized. Definitions, publication schedules, revisions, coverage and methodology differ across providers and jurisdictions. Open Market Rank aims to make those differences visible rather than hide them behind a false impression of precision. For professional, academic or investment analysis, review the original source and its methodology before relying on a figure.