The US duty and tariff API for landed cost.
One REST call returns the fully-stacked rate for any HTS code and country of origin, resolved in the right legal order.
Not a developer? Look up any code in the dashboard.
as_of
Used in production by importers, customs brokers, and supply-chain platforms.
From signup to first call
in under 10 minutes.
Every layer of the US tariff stack. One source of truth.
Harmonized Tariff Schedule
All 17,000+ 10-digit subheadings. Column 1 General, Column 1 Special (FTAs), Column 2.
China lists + forced-labor duty
China Lists 1-4A and exclusions, plus the country-wide forced-labor duty that added ~55 origins on 24 July 2026.
Steel, aluminum, derivatives
The merged 2026 metals regime plus autos, trucks, timber, and semiconductors. Country quotas and exemptions included.
Emergency tariffs
Country and product scope, refund-eligible periods flagged for CAPE and later rulings.
Modifiers & overrides
Every Chapter 99 subheading that layers on top, with stacking order respected.
Antidumping & countervailing
Active cases by producer and country, including cash deposit rates from the ITA.
Canada, from 19 Aug 2026
An additional 50% on Canadian autos, alcohol, and dairy under a 1930 authority last used in the 1940s. Scope modeled from the proclamation annexes, so as_of queries on or after 19 August already return it.
The tariff API — one endpoint, deterministic JSON.
GET /api/v1/tariffs/resolve?hts=…&origin=… returns the base duty, every applicable Chapter 99 measure, a confidence score, and attempted candidates when the match isn't exact. Bulk endpoint accepts up to 200 codes per request. REST + JSON. No SDK required.
GET /api/v1/tariffs/resolve?hts=8541.10.00.80&origin=CN
// deterministic, no AI guessing
{
"hts": "8541.10.00.80",
"origin": "CN",
"match_type": "exact",
"match_level": "10",
"confidence": 1.0,
"base_duty": { "rate": "0%", "rate_type": "general" },
"additional_measures": [
{ "program": "Section 301", "rate": "50%", "chapter_99_ref": "9903.91.05" }
],
"warnings": [],
"attempted_candidates": []
}Public pricing. Start today.
14-day free trial. Card required at signup, cancel any time before day 14 and pay nothing. White-label, reseller and high-volume terms are priced on a call.
- ✓10,000 API calls per month
- ✓Single + bulk /resolve (up to 200 HTS per request)
- ✓Section 301, 232, IEEPA, Chapter 99 stacking
- ✓Historical rates with as_of
- ✓Confidence scores, warnings, match metadata
- ✓100 watched codes + change alerts
- ✓MCP server access
- ✓2 team seats
- ✓250 AI assistant messages / mo
- ✓Standard rate limits
- ✓White-label and reseller terms: our data inside your product
- ✓Your import lanes pinned in our regression suite and canaried against production
- ✓Volume beyond the 10,000 calls on the standard plan
- ✓Annual contract, invoicing, and PO / procurement
- ✓Custom SLA and a direct line for rate questions
- ✓Onboarding, integration review, and vendor security review
Verified at every step.
Every rate we publish is pulled from official US trade publications, kept beside its raw source, audited by a separate AI pass, and re-tested before it ships. Traceable, audited, continuously tested.
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1Ingestion Pulled from source
Pulled directly from official publications. No spreadsheets. No scraping third-party sites. Every source row is preserved exactly as published.
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2Source archive Kept unchanged
Raw kept beside structured. Tagged to a numbered revision. We can reconstruct the rate on any past date.
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3Structured parse Made machine-readable
Raw duty text becomes structured rates. Every parsed value records how it was derived. Clean extractions stand apart from anything that needs review.
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4Independent audit Second pass, AI
A separate AI re-reads the source. Anything that does not match what we published gets flagged. Not the same system checking its own work.
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5Regression tests Caught before ship
Known lookups re-run on every update. Any failure is caught before it reaches a single customer.
Every rate is provable, audited, and continuously tested.
Stake a customs filing on it. We keep the receipts.
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Aug 03ImportHTS 2026HTSRev15 importedUSITC published 2026HTSRev15 and it is now live in the API. 2 rates changed.
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Aug 02RegulatoryUnited Kingdom pharmaceutical duty reduced to 0%Heading 9903.04.63, the United Kingdom lane of the Section 232 action on patented pharmaceuticals, was reduced from an additional 10% to ...
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Aug 02RegulatoryCorrected: Section 301 rates on 8 China lanes (note 20), and the 9903.88.70 solar-equipment exclusion now surfacedFixed a Section 301 data defect affecting Chinese-origin goods under U.S. note 20: expired product-exclusion subdivisions were being serv...
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Jul 31ImportHTS 2026HTSRev14 importedUSITC published 2026HTSRev14 and it is now live in the API. 10 rates changed.
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Jul 31RegulatoryCSMS # 69403181 - Harmonized System Update (HSU) 2618Verdict: NO DATA IMPACT as a separate action — HSU 2618 is the ACE/HTS implementation of the Section 232 patented-pharmaceuticals duties ...
You ask. We answer.
Can I calculate tariffs programmatically?
Yes. GET /api/v1/tariffs/resolve takes an HTS code and country of origin and returns the base duty plus every applicable Chapter 99 measure with rates, effective dates, and confidence scores. Bulk endpoint handles up to 200 codes per request. Pass as_of for historical rates. See /api-documentation.
Where does the data come from?
Every rate returned by Tariffs API comes from the official US Harmonized Tariff Schedule published by USITC, combined with USTR, CBP, and Federal Register notices for Section 301, 232, 122, and IEEPA measures. We never invent numbers.
How often is it updated?
Base HTS data is refreshed weekly against USITC's published schedule. Chapter 99 and trade-measure updates are captured daily from USTR and CBP notices. Breaking changes (new Section 301 rounds, IEEPA proclamations) are applied within 24 hours of publication.
Do you cover Section 301, Section 232, IEEPA, and reciprocal tariffs?
Yes. Section 301 (China), Section 232 (steel, aluminum, autos, semiconductors), Section 122 reciprocal duties, and IEEPA measures (including the 2025 baseline, trafficking-related, and Brazil/India-specific actions) are all resolved and stacked correctly on top of base HTS rates. Chapter 99 reference codes are resolved to numeric rates when available.
How does the 14-day free trial work?
Sign up with email and a card. You get full access to the API and every endpoint for 14 days. Cancel any time before day 14 and you're not charged. After day 14 the plan is $199/month. No long-term contract, cancel from the customer portal at any point.
What are the rate limits and infrastructure?
Pro is 500 requests per minute. Bulk /resolve handles up to 200 HTS per request with deduplication and caching, so a single bulk call counts as one API call against your monthly quota. Served from US-East on PostgreSQL with Redis caching. Enterprise customers get a contractual SLA.
How should I interpret the confidence score?
Every resolved measure includes a confidence score and a match type (exact, prefix, inherited). High confidence means the HTS code matched a measure directly. Medium or low means we inferred the match from a parent heading or a normalized variant — the JSON response includes attempted_candidates so you can verify. For anything low-confidence, cross-check with your broker or CBP.
Does Tariffs API replace a customs broker?
No. Tariffs API gives you accurate rate data and landed-cost calculations, but does not file entries, issue binding classification rulings, or act as a customs broker. Use it for checkout pricing, catalog pricing, compliance planning, and audit trails. Final classification and entry filing should go through a licensed customs broker.
Is this legal advice or a binding classification?
No. Data is for informational purposes. Final classification and duty determinations are made by US Customs and Border Protection (CBP). For binding rulings, request a CBP ruling letter. We tell you what the schedule says — CBP tells you what applies to your specific entry.
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