US tariff API + MCP: HTS duty rates, Section 301 lists. Keys $19/mo; 50 free calls a day.
Streamable HTTP
https://dutyfinch.cybermaxtools.com/mcp?via=mcp-registryclaude mcp add --transport http dutyfinch https://dutyfinch.cybermaxtools.com/mcp?via=mcp-registryThis server publishes no installable package.