UN Comtrade Database
https://comtradeplus.un.org/
The United Nations Comtrade database aggregates detailed global annual and monthly trade statistics by product and trading partner for use by governments, academia, research institutes, and enterprises. Data compiled by the United Nations Statistics Division covers approximately 200 countries and represents more than 99% of the world’s merchandise trade. Information can be extracted in a variety of formats, including API developer tools for integration into enterprise applications and workflows. Subscribers receive access to additional functionality to improve efficiency and specificity.

World Trade Organization (WTO) online systems
https://www.wto.org/english/res_e/wtoapps_e.htm
This page lists the WTO online systems (databases/websites) which are currently in production.