Tariff Code Finder in ChatGPT
Tariff codes and duty rates. The MCP server is https://tariffs.openkrill.app/mcp. No key. The steps below are only for ChatGPT. A call to get_duty_rate was checked against that server on 2026-10-01.
What this server answers
Find candidate customs tariff codes for a product and read the import duty on a code. Ask "what is the tariff code for a ceramic flower pot in the UK?", "what is the US duty on HTS 8507.60.00?" or "what duty applies to code 6914100000 from Vietnam in the UK?".
Tariff Code Finder reads the official schedules published by governments: the UK Trade Tariff (HM Revenue & Customs) and the US Harmonized Tariff Schedule (US International Trade Commission). Describe the product and it lists the codes whose descriptions match, with the headings above each one so a line that only says "Other" can be read in context. Give a code and it returns the description, the duty rate and, for the UK, the VAT rate, the preferential rate for the country the goods come from and other measures that apply.
The codes it finds are candidates, not a classification. Which code is right depends on what the product is, what it is made of and how it is used, and customs decides. Check a candidate against the schedule's notes and confirm with customs or a licensed customs broker before you declare goods. For a binding answer, ask customs for a ruling.
The duty it shows is the rate in the schedule for that code. It does not add every extra duty, quota, anti-dumping measure or trade remedy. For the US, additional duties under chapter 99 of the schedule are not included. Rates change on published dates, so check the schedule on the day you ship.
It covers imports into the United Kingdom and the United States only. It stores nothing about you: answers are cached for up to 6 hours, and the only lasting record is a daily count of calls per tool.
What it can do
- Finds candidate tariff codes for a described product in the UK or US schedule
- Shows the headings above each candidate, so lines called Other can be read in context
- Reads the import duty rate for a UK or US tariff code
- Shows UK VAT, the preferential rate for an origin country and other measures on a code
- Lists the lines under a heading when a code is not one goods are declared under
- Labels every code as a candidate to check with customs, not a binding classification
Tools
find_tariff_codes, Find candidate tariff codes. Use this when the user asks for the tariff code, commodity code, customs code or HS code for a product, for example "what is the tariff code for a ceramic flower pot in the UK?", "HTS code for a lithium-ion battery" or "which heading covers cotton t-shirts for import into the US?". Pass a plain description of the product and country GB (United Kingdom) or US (United States). Returns candidate codes from the official schedule, each with its description, the headings above it and whether goods are declared under it, plus a notice that they are candidates and not a binding classification. Do not use it to classify goods with certainty, to give a binding customs ruling, to compute shipping or landed cost, or for countries other than GB and US.get_duty_rate, Get the duty rate for a tariff code. Use this when the user asks what import duty, tariff or VAT applies to a tariff code, for example "what is the US duty on HTS 8507.60.00?", "what duty applies to UK commodity code 6914100000 from Vietnam?" or "what is under heading 6914 in the UK tariff?". Pass the code (4 to 10 digits, dots allowed), country GB or US, and originCountry when the user names where the goods come from. For a code goods are declared under it returns the description and the rate: for the UK the third-country duty, VAT rates as a list, the preferential rate and any additional duty for the origin, and other measures; for the US the general, special and column 2 rates and units. For a code that is only a heading it returns the lines beneath it instead. Chapter 99 additional duties for the US and quotas or trade remedies are not included. Do not use it for a landed cost estimate, for excise or customs-broker fees, or for legal advice.
Add Tariff Code Finder in ChatGPT
ChatGPT does not read a local config file. A custom MCP server is added in the product, and only after developer mode is on. These steps were checked against OpenAI's plugin connect guide and the ChatGPT MCP guide on 2026-10-01. Developer mode can be hidden by a workspace policy, so a Team or Enterprise admin may have to allow it first.
- Open ChatGPT settings, then Security and login, and turn on Developer mode.
- Open ChatGPT plugins and select the plus button.
- Enter a name such as "Tariff Code Finder" and a one-line description of what you want it to answer.
- Under Connection, choose the public endpoint and paste
https://tariffs.openkrill.app/mcp. Include the/mcppath. Do not add a tunnel id: this server is already public. - Create the connection and review the tools ChatGPT lists. You should see
find_tariff_codes,get_duty_rate. The feedback tools on the same server are optional and not required for the lookup. - Start a new conversation, add the connection from the tools menu, and ask: What are candidate tariff codes for a ceramic flower pot in the UK?
No API key and no OAuth client id are required. The server answers without a login. Calls are limited per network and per day, and a limit comes back as a tool error rather than a partial answer. If the tool list is stale after a server change, open the connection and select Refresh, then start a new conversation.
The ChatGPT desktop app, Codex CLI and IDE extension share a different config. In the desktop app, open Settings, then MCP servers, choose Add server, select Streamable HTTP, and paste the same URL. In ~/.codex/config.toml the equivalent is a table named mcp_servers.tariffs with url = "https://tariffs.openkrill.app/mcp". ChatGPT on the web does not read that file. A published directory listing is also a different path: this page is the developer-mode connection, not a claim that Tariff Code Finder is already in the ChatGPT directory.
Treat the server as untrusted until you have read a few answers. A remote MCP server sees the arguments the model sends. Tariff Code Finder is read-only and documents what it sends onward on the privacy page.
A call checked on 2026-10-01
HTS 8507.60.00 is the lithium-ion battery heading named in the plugin's starter prompts. The rate is a schedule reading, not a classification. The request below was posted to https://tariffs.openkrill.app/mcp as tools/call. HTTP 200. Source: the Tariff Code Finder server, read 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "get_duty_rate",
"arguments": {
"code": "8507.60.00",
"country": "US"
}
}
}- source. Harmonized Tariff Schedule of the United States (hts.usitc.gov), published by the US International Trade Commission.
- country. US
- notice. These are candidate codes from the official tariff, not a binding classification. The right code depends on what the product is, what it is made of and how it is used; confirm with customs or a licensed customs broker be
Repeat the call yourself if you need a newer reading. Cached answers expire. A rate limit is not a result: wait and try again. Nothing in the call is a ranking, a filing, or advice.