US import tariff estimates: HTS lookup and stacked rate (MFN + Section 301 + 232). No API key.
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.
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.
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.
{
"mcp": {
"servers": {
"tariffmonitor": {
"command": "npx",
"args": ["-y", "tariffmonitor-mcp"]
}
}
}
}
The tool calls the free public API at adcreator-ai.com. No signup, no rate limits for reasonable use.
Built by Dale Weaver / 0xpi.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y tariffmonitor-mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-daleweaver1981-tariffmonitor-mcp": {
"command": "npx",
"args": [
"-y",
"tariffmonitor-mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referencetariffmonitor-mcpnpmio.github.daleweaver1981/tariffmonitor-mcp works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.