This paper documents the construction of BACI, a detailed international trade database covering over 200 countries and 5,000 products from 1994 to 2007. The database reconciles data reported by more than 150 countries to the United Nations Statistics Division via COMTRADE, addressing discrepancies between reported import and export values. The reconciliation process involves estimating transport costs from CIF (Cost, Insurance, and Freight) to FOB (Free on Board) values using a gravity-type equation, and evaluating the reliability of country reports to weight the averaging of mirror flows. BACI offers more comprehensive and reliable data compared to other databases, particularly in terms of unit values, and is freely available online for users of COMTRADE in different product classifications. The methodology is purely statistical and can be applied to various trade datasets, making it a valuable tool for international trade analysis.This paper documents the construction of BACI, a detailed international trade database covering over 200 countries and 5,000 products from 1994 to 2007. The database reconciles data reported by more than 150 countries to the United Nations Statistics Division via COMTRADE, addressing discrepancies between reported import and export values. The reconciliation process involves estimating transport costs from CIF (Cost, Insurance, and Freight) to FOB (Free on Board) values using a gravity-type equation, and evaluating the reliability of country reports to weight the averaging of mirror flows. BACI offers more comprehensive and reliable data compared to other databases, particularly in terms of unit values, and is freely available online for users of COMTRADE in different product classifications. The methodology is purely statistical and can be applied to various trade datasets, making it a valuable tool for international trade analysis.