tariffmonitor-mcp

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.