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US ACE Portal
https://www.cbp.gov/trade/automated
Overview
ACE (Automated Commercial Environment) is the US government portal for import documentation. While most importers file through a customs broker, understanding ACE — including ISF (10+2) requirements that must be filed before your China shipment sails — helps you ask the right questions and avoid penalties that run into thousands of dollars.
Best for
Buyers importing into the US who want to understand the filing process
Pricing
Free government portal
Pros
- Official source for US filing requirements
- ISF timing rules clearly documented
- Free educational material
Cons
- Not a user-friendly consumer site
- Filing done by brokers in practice
- US-only