GUIEX Customs Tariff for artificial intelligence assistants
Connect your assistant to the GUIEX tariff. The assistant does the reasoning and our lookup gives it the exact data at 10 digits, with no artificial intelligence on our side.
Private GUIEX service, not official. Neither the European Commission nor any public authority takes part in it or endorses it.
The address
The address for assistants is https://api.guiex.net/mcp. It is the only official one. It is free and needs no registration or key.
It speaks the MCP protocol, the one Claude, ChatGPT, Gemini, Codex, Mistral, Perplexity, Cursor and Copilot use today to query external tools.
How to connect it
In Claude, ChatGPT, Mistral Le Chat or Perplexity, add a custom MCP connector or server with that address and no sign-in. Each assistant names it in its own way and offers it depending on the plan.
In Claude Code: claude mcp add --transport http arancel-guiex https://api.guiex.net/mcp
In Codex: codex mcp add arancel-guiex --url https://api.guiex.net/mcp
In Cursor, VS Code and other environments, add a remote MCP server over HTTP with that address.
What your assistant can look up
Search codes by words or by their first digits, and go down the nomenclature tree to the 10-digit code.
The sheet for a code for an operation, with the direction and the country: duties, preferences, suspensions, quotas and anti-dumping, VAT, excise duties and plastic packaging tax, controls, and the documents of each measure with their exemption codes.
The legal and explanatory notes, and the binding tariff information (BTI) decisions for a code.
An indicative calculation of the charges on an import.
The document templates for customs, with the link to each one on this website.
The lookup does not classify goods: it returns lines, measures and official texts. The classification is reasoned by the assistant with you.
Territory covered and value of the information
It covers Spain (mainland and Balearic Islands). It is not valid for the Canary Islands, Ceuta or Melilla.
The information is for guidance only and is not binding. Only a Binding Tariff Information (BTI) decision issued by customs is binding.
Each answer carries the territory, the date of the data, the source and a link to the full sheet on this website.
Limits
Up to 20,000 queries a day across all assistants and a limited number of consecutive queries per connection. If the limit is reached, the assistant receives a notice to try again later.
Privacy
We receive only what the assistant asks for: a code, some words, a country, a date and a language. We do not receive your conversation, we do not know who you are and we neither store nor log what is queried.
Your conversation with your assistant is processed by its provider, under its own terms. The details are in section 12 of the legal notice.
For developers
The same lookups are available over HTTP, with their OpenAPI document at https://api.guiex.net/v1/openapi.json. Same base address, same limits and no key.
Sources
Data: TARIC catalogue, TARIC measures and BTI (EBTI) © European Union, and Spanish legislation, restructured by Guiex. Anyone reusing the answers must cite the source.
