Summary
Gives Claude two tools to query live US import tariffs across 19,856 HTS codes: lookup_hts_code searches by description or prefix, and calculate_tariff returns the full stacked rate (MFN base plus Section 301, IEEPA, and reciprocal tariffs) with projections for the November 10, 2026 rate cliff. Pass an annual import value and it computes dollar impact before and after the cliff. Hits a free public API at adcreator-ai.com with no authentication. Useful if you're modeling supply chain costs, advising importers, or need to answer "what will this product cost to bring in from China next year" without opening a spreadsheet.
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MCP server for the Tariff Exposure Monitor — a live US import tariff calculator covering 19,856 HTS codes.
Give Claude (or any MCP-compatible AI) the ability to look up real stacked tariff rates and project the November 10, 2026 cliff impact on any product.
What it does
Two tools:
| Tool | What it does |
|---|---|
lookup_hts_code | Search 19,856 HTS codes by description or numeric prefix |
calculate_tariff | Returns an estimated stacked rate (MFN base + Section 301 + Section 232) and flags the Nov 10, 2026 Section 301 exclusion expiry. Optional: annual import volume → dollar impact |
Example exchange — a real capture from the live API on 2026-09-11, not a mock-up:
You: What's the tariff on athletic footwear from China, and what does it cost me at $800k/year?
Claude: [calls lookup_hts_code query="athletic footwear", then calculate_tariff
hts_code="6404110000", origin_country="CN", annual_import_value_usd=800000]
Note: 6404110000 is not in the schedule. This rate is for heading 640411, resolved to 6404112030.
HTS 6404112030 - For men
Origin: CN
Rate stack:
MFN base rate: +0.00%
Section 301 (China trade enforcement): +7.50%
Total current rate: 7.50%
No cliff change projected for this code/country combination.
Dollar impact at $800,000/yr import value:
Current annual duties: $60,000
Rates change, and a rate is per HTS code and origin country - treat the numbers above as the shape of the answer, not as a quote for your shipment. The tool never invents a rate: if the upstream is unreachable or the code is not in the schedule, it says so instead of estimating.
Install (Claude Desktop)
Add to your claude_desktop_config.json:
{
"mcpServers": {
"tariffmonitor": {
"command": "npx",
"args": ["-y", "tariffmonitor-mcp"]
}
}
}
Restart Claude Desktop. The lookup_hts_code and calculate_tariff tools appear automatically.
Install (Cursor / other MCP clients)
{
"mcp": {
"servers": {
"tariffmonitor": {
"command": "npx",
"args": ["-y", "tariffmonitor-mcp"]
}
}
}
}
No API key required
The tool calls the free public API at adcreator-ai.com. No signup, no rate limits for reasonable use.
Related
- Free tariff calculator — browser version
- Official US Harmonized Tariff Schedule — the authoritative rates
Built by Dale Weaver / 0xpi.
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →