HTS Calculator
Products
HTS Calculator products: one key and one plan for all of them, each as a REST API, an MCP tool and, where it helps, a web tool.
HTS code, origin, entry date and value in: the US duty stack (base rate and Chapter 99 lines) and the duty in dollars out, in the browser.
/calculator/10 free calculations a day
The base rate plus every Chapter 99 line for an HTS code, origin and entry date, with citations and the duty in dollars.
POST/v1/tariffs/duty-stack10 units
The tariff schedule as of any date: lines, base rates, revisions, changes and the Chapter 99 measures that reach a code.
GET/v1/tariffs/hts/search
?q=cap+screws &limit=51 unit Entry lines in: the refundable IEEPA amount and the CAPE route for each line out.
POST/v1/tariffs/ieepa-refund10 units per line
Every dated change to Chapter 99 measures, HTS lines and base rates, as a feed you can poll.
GET/v1/tariffs/changes
?since=2026-09-01 &limit=201 unit Duty stacks, HTS lookups, measures, refunds and the change feed as tools for AI agents.
POST/mcpsame units as REST
The effective-dated dataset and bulk files for embedding and research (a daily delta feed is coming soon).
GET/v1/datasets/tariffs/snapshot
The effective-dated dataset and bulk files for embedding and research (a daily delta feed is coming soon). Bulk files and enterprise terms, or write to support@htscalculator.com.