Most cross-country indicators here come from the World Bank, whose open data platform compiles broad development and economic series — GDP, GDP per capita, trade and more — for nearly every country, often back several decades. Its strength is breadth and consistency across countries; the trade-off is that recent years may be incomplete or estimated for some economies.
The International Monetary Fund (IMF) publishes its own macroeconomic data and the World Economic Outlook, which includes forecasts as well as historical figures. Because the IMF and World Bank use partly different methods and update on different schedules, the same indicator for the same country can differ slightly between them — a difference of source, not necessarily of accuracy.
UN Comtrade is the reference database for bilateral merchandise trade flows, recording reported exports and imports between pairs of countries by product. Reported flows do not always agree between the two partners (each side counts somewhat differently), coverage varies by country, and the free tier limits how much data can be pulled at once. FRED, maintained by the US Federal Reserve, hosts a deep catalog of mostly US economic time series and is useful for high-frequency US indicators.
Because these sources differ in coverage, timing, currency conventions and definitions, figures are not always directly comparable across them, and gaps are common — especially for smaller economies and the most recent periods. TradePulse labels the source for each indicator so you can see where a number comes from and weigh it accordingly.