Shop Duty Desk in ChatGPT
Duty and customs data checks. The MCP server is https://shopduty.openkrill.app/mcp. No key. The steps below are only for ChatGPT. A call to eu_duty_estimate was checked against that server on 2026-10-01.
What this server answers
Check the customs side of selling online across borders.
Ask "what EU duty applies to my 6 order lines shipped under IOSS?", "which products in my Shopify inventory export have no HS code or country of origin?", "find candidate tariff codes for these 15 products" or "what is the landed cost of this item shipped to the UK?".
Shop Duty Desk estimates the 3 euros per item EU customs duty on low-value consignments (Council Regulation (EU) 2026/382, with the item definition in Commission Delegated Regulation (EU) 2026/1022), and shows how many items a set of order lines counts as, with and without merging identical lines.
It checks a Shopify Inventory CSV (the file that holds HS code and country of origin) or product CSV for missing or malformed HS codes, origins, item identifiers and barcodes, and lists the rows to fix.
It suggests candidate tariff codes for product titles from the UK Trade Tariff and the US Harmonized Tariff Schedule, and estimates the landed cost of an item from a tariff line using those official duty rates and a small dated VAT table with a source for each rate.
Every HS code it returns is a candidate, not a binding classification; confirm it with customs or a customs broker.
It does not look up EU TARIC rates or Canadian rates, does not include US chapter 99 additional duties, and covers the 3 euros rule only for consignments up to 150 euros.
Order lines carry no customer data: lines with a name, address or other customer field are refused. Nothing you send is stored; there is no account and no IP address is kept, only a daily count of calls per tool.
What it can do
- Estimates the 3 euros per item EU customs duty for consignments up to 150, euros citing the regulations
- Counts items for the duty both as lines are given and with identical lines merged
- Checks a Shopify Inventory or product CSV for missing HS codes, origins, identifiers and invalid barcodes
- Suggests candidate UK and US tariff codes for up to 20 product titles, labelled not binding
- Estimates duty, VAT and landed cost of an item from a UK or US tariff line
Tools
eu_duty_estimate, Estimate EU duty on a low-value consignment. Estimate the EU customs duty on a consignment of up to 150 euros imported under IOSS or by post: 3 euros per item from 1 July 2026 until 1 July 2028 (Council Regulation (EU) 2026/382, Delegated Regulation (EU) 2026/1022). Use it for questions like "what duty applies to these order lines?", "how many items does this parcel count as?". Pass lines (description, origin, qty, unit_value_eur, optional hs_code) and channel (ioss or postal); optional consignment_value_eur and date. Lines must not carry customer fields. Returns the item count as given and with identical lines merged, the duty for each, the legal basis, and the assumptions. Consignments over 150 euros and dates outside the period return no duty and say why.customs_data_gap_check, Check a Shopify CSV for customs data gaps. Check the text of a Shopify Inventory CSV (it holds HS Code and COO, country of origin) or product CSV for missing or malformed HS codes, countries of origin, item identifiers (SKU or barcode) and invalid barcodes. Use it for "which products have no HS code?", "is my export ready for customs?". Pass the csv text exactly as exported, up to 2 MB. Returns counts (null where the file has no such column), up to 200 rows with the problem on each, and notes on columns the file lacks. Nothing is stored: the input is used for this answer and dropped.bulk_hs_candidates, Find candidate tariff codes for products. Suggest candidate tariff (HS) codes for up to 20 product titles from the UK Trade Tariff and, if asked, the US Harmonized Tariff Schedule. Use it for "what HS code could this product use?". Pass products (title, optional description) and optional markets (UK, US). Returns up to 3 candidates per product and market with code, description and source. Every code is a candidate, not binding; a large list may be cut short and says so per product.landed_cost_estimate, Estimate duty, VAT and landed cost. Estimate the duty, VAT and total landed cost of an item shipped to the UK, US or EU from a tariff line. Use it for "what will import duty and VAT be on this?". Pass hs_code (a full tariff line, a candidate, not binding), destination (UK, US, EU), goods_value and shipping in one currency; optional origin, and country (member state) for EU VAT. UK and US duty rates are read from the official tariffs; EU duty is not looked up. Returns duty, VAT and total with the rate, basis, sources and date. A rate that is not a plain percentage is returned as text with no amount. US chapter 99 additional duties are not included.
Add Shop Duty Desk 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 "Shop Duty Desk" and a one-line description of what you want it to answer.
- Under Connection, choose the public endpoint and paste
https://shopduty.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
eu_duty_estimate,customs_data_gap_check,bulk_hs_candidates,landed_cost_estimate. 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 EU duty applies to these 6 order lines shipped under IOSS?
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.shop-duty with url = "https://shopduty.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 Shop Duty Desk 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. Shop Duty Desk is read-only and documents what it sends onward on the privacy page.
A call checked on 2026-10-01
Two identical low-value lines exercise the IOSS estimate. No customer fields are sent. The request below was posted to https://shopduty.openkrill.app/mcp as tools/call. HTTP 200. Source: the Shop Duty Desk server, read 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "eu_duty_estimate",
"arguments": {
"channel": "ioss",
"lines": [
{
"description": "cotton t-shirt",
"origin": "CN",
"qty": 2,
"unit_value_eur": 12
}
]
}
}
}- legal basis. 2 returned
- consignments. 1 returned
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.