You wire money to a 1688 supplier, then find the real cost — duty, VAT, freight, prep, MOQ — after it lands and the margin is gone. I built 12 free tools out of the checks our team runs in Yiwu: HS code & import duty, landed cost, CBM with a 3D container load check, shipping comparison, MOQ break-even, supplier risk screening, restricted goods, and Incoterms 2020. No signup. Estimates, not fixed-rate promises.