Free US Tariff Data API

The data behind our calculators, as JSON: current US tariff rates by country and product sector with the full stacking regime applied (Section 122 / bilateral ceilings, Section 301, Section 232), and a dated feed of every tariff-regime change since 2025. Maintained continuously as news breaks. No key, no signup — attribution is the only requirement.

Endpoints

1. Rates catalogue

GET https://www.tariffstool.com/api/v1/rates

Lists every supported country (36) and product sector (14) with their identifiers.

2. Rates by country

GET https://www.tariffstool.com/api/v1/rates?country=china

{
  "country": { "code": "CN", "name": "China", "slug": "china" },
  "profile": {
    "mfn_avg_pct": 3.4,
    "base": { "regime": "section-122", "section_122_pct": 10, ... },
    "section_301_pct": 25,
    "section_232_steel_pct": 50,
    "de_minimis_usd": 0,
    ...
  },
  "sector_rates": [
    { "sector": "electronics", "effective_rate_pct": 35 },
    ...
  ]
}

3. Rate by country + sector

GET https://www.tariffstool.com/api/v1/rates?country=china&sector=electronics

Single effective rate with the breakdown (base, surcharge, notes) and the country profile.

4. Regime-change feed

GET https://www.tariffstool.com/api/v1/changes
GET https://www.tariffstool.com/api/v1/changes?since=2026-06-01
GET https://www.tariffstool.com/api/v1/changes?tag=de-minimis

Dated, curated log of US tariff-regime changes — SCOTUS ruling, Section 122, the EU ceiling, de minimis, CAPE refund milestones — each with status (effective/pending/announced) and tags.

Terms

Attribution required: display “Data: TariffsTool.com” with a link to https://www.tariffstool.com wherever the data appears.
Fair use: responses are cached (1h); please cache on your side too. For production or high-volume use, contact us — we’re happy to support real integrations.
Disclaimer: sector-level representative rates for informational purposes only — not HTS-line classification, not customs or legal advice. Verify binding rates with a licensed customs broker.

Built by Master Plan — the team behind the tariff calculator, duty drawback calculator, and the tariff guide library.