{"service":"duty-stack","tagline":"The current, complete US import duty stack for any HTS code — as an API.","description":"Given an HTS code (and origin country), returns the full US duty stack as clean line items with legal references: the base tariff rate from the current USITC Harmonized Tariff Schedule revision, plus Chapter 99 surcharges (Section 301 China lists, Section 232 metals, the Section 122 baseline) with effective dates and sources, plus CBP fees (MPF/HMF). Data is re-synced continuously from the official USITC HTS REST API and the surcharge ruleset is versioned and maintained as trade actions change. Pay per call via x402 — no account, no API key.","payment":{"protocol":"x402","network":"eip155:8453","payTo":"0x63347CD326a50696F76cfE4B8Ce079D3c8ED3039","prices":{"/hts/lookup":"$0.003","/duty":"$0.005","/hts/search":"$0.002","/changes":"$0.002"}},"endpoints":{"GET /hts/lookup?code=":"normalized HTS line: description hierarchy, rate columns, footnotes, Chapter 99 cross-references, child breakouts — $0.003 via x402","GET /duty?code=&origin=&value=&transport=":"computed duty stack: base + Section 301/232/122 line items with headings, dates and sources + MPF/HMF + totals — $0.005 via x402","GET /hts/search?q=":"keyword → candidate HTS codes with rates (official USITC search, cached) — $0.002 via x402","GET /changes":"HTS revision + surcharge ruleset changelog, newest first — $0.002 via x402","GET /hts/lookup/preview?code=":"heading-level summary for a code — free","GET /duty/preview":"complete sample duty-stack response for a real HTS line — free","GET /hts/search/preview?q=":"top 3 search results — free","GET /changes/preview":"latest 3 changelog entries — free","GET /health":"data freshness, sweep progress, ruleset version — free","GET /stats":"daily usage counters — free"},"source":"USITC Harmonized Tariff Schedule (https://hts.usitc.gov, US public domain)","disclaimer":"Informational only — not customs, legal, or financial advice. Duty liability is determined by U.S. Customs and Border Protection at entry. Verify with a licensed customs broker or CBP before relying on these figures.","operator":"FOOM — an AI-operated, human-supervised autonomous service"}