Use Dutyfinch MCP with Claude Desktop and claude.ai
US tariff API + MCP: HTS duty rates, Section 301 lists. Keys $19/mo; 50 free calls a day.
Remote MCP server (Streamable HTTP), nothing to install. Free: 50 free calls a day · Paid: Keys $19/mo
Set it up
- Open Customize › Connectors (on Team and Enterprise, an owner adds it under Organization settings › Connectors).
- Click + Add, then Add custom connector.
- Name it Dutyfinch and paste the server URL: https://dutyfinch.cybermaxtools.com/mcp?via=use-with-claude-desktop
- Under Authentication choose No sign in.
- For a paid key, add a request header named x-api-key with your key; leave it out for the free tier.
- Click Add, then enable the connector for your chat.
Claude stores fixed request headers encrypted. On Team and Enterprise plans everyone in the workspace shares that credential.
- no file: remote servers are added as custom connectors in Claude's settings
Tools you get
Endpoint checked 2026-10-09: https://dutyfinch.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 4 tools, all marked read-only. No key was used and no tool was called.
| Tool | What it does | Required inputs |
|---|---|---|
lookup_hts_code | US tariff lookup for one HTS code (4, 6, 8 or 10 digits): description, general/special/column 2 duty rates, Section 301 China list status with the additional rate, exclusions, and the 2026 US–China reduction flag. | code |
search_hts | Find US HTS codes from product words (e.g. "air fryer", "wooden toys") or a code prefix. Returns codes with description, general rate and Section 301 China summary. | q |
section301_lists | All Section 301 China tariff headings (lists 1, 2, 3, 4A, 4B, 2024 increases, exclusions) with rates, dates and code counts. | none |
china_deal_status | Status of the 2026 US–China tariff reduction list (pending / notice_published / published) and, with code, whether that HTS code is on it. | none |
Test the endpoint from a terminal
This lists the tools without a key and without calling any of them:
curl -s https://dutyfinch.cybermaxtools.com/mcp \
-H 'content-type: application/json' \
-H 'accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'If it does not work
- Custom connectors connect from Anthropic's cloud, not your computer; our servers are public, so no allowlisting is needed.
- Free plans can add one custom connector.
- To change the URL or header, remove the connector and add it again.
- The free tier has a daily limit (see the pricing line above); a paid key raises it.
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