Free API: Look Up Any US Tariff Rate in Seconds

Tariff data is a surprisingly painful problem for developers. The official source — the USITC Harmonized Tariff Schedule — is a 3,500-page PDF. The API alternatives are either expensive, incomplete, or don't include the Section 301 China surcharges that have fundamentally changed import costs since 2018. So I built one: the US Tariff Rates API at ustariffrates.com/dev . Here's what it covers and how to use it. What the API does HTS code search — full-text search across 35,571 codes Tariff details — MFN rate + Section 301 (China) + Section 232 (steel/aluminum) + AD/CVD + FTA rates, all in one response Landed cost calculator — duties + Merchandise Processing Fee + Harbor Maintenance Fee AI classification — describe a product in plain English, get the HTS code Free tier: 100 calls/month. No credit card required. Getting Started Get a free API key at ustariffrates.com/pricing — instant, no approval needed. Base URL: https://ustariffrates.com/api Auth: X-API-Key header Example 1: Search for