Retain
Fetch only declared government sources. Store the raw response, resolved URL, retrieval time, media type, size, and checksum.
METHOD + LIMITS
Evidence first.
Arithmetic second.
DutyMesh treats customs cost as a versioned evidence problem. A polished number is never allowed to outrun the facts behind it.
13 artifacts20/20 audits0 approved public releases
Normalize
Parse source-specific formats into effective-dated tariff rows without erasing source expressions, conditions, or inheritance.
Audit
Compare exact codes, rate kinds, decimals, inheritance, and official locators against a fixed jurisdiction-and-product matrix.
Gate
Keep every calculation release private until schema, integrity, source-rights, coverage, and human publication checks pass.
Calculate
Resolve the entry-date regime and each material component. Any unresolved input or dataset suppresses the grand total.
WHAT THE CORRIDOR PAGES PROVE
Twenty base-tariff audit matches.
They show that candidate normalized rows can reproduce the selected official base-rate evidence for four product families across five jurisdictions on the audit date.
WHAT THEY DO NOT PROVE
A complete import bill.
They do not prove universal classification, origin qualification, tax collection, remedies, exemptions, carrier fees, brokerage, currency conversion, admissibility, or future rates.