Search companies
Companies by the start of a name or a business ID, narrowed by address country or jurisdiction if you like, each with its permanent ID.
search_companies
Free Company Data WebMCP
Free company data WebMCP tools for the AI agent in your browser: search the trade registers and read a company's registry facts from any page of this site. No key, no account.
How it works
- 1
Open any page
Open a TradeRegister.fi page in a browser that has WebMCP, such as the one inside the ChatGPT desktop app.
- 2
Ask your agent
Ask for a company by name or business ID. The agent finds the page's tools and calls them: the search, then the profile.
- 3
Your browser calls the free API
Each call leaves your own browser for the free API at https://api.traderegister.fi, without a key or cookies, within your address's 60 requests a minute.
Two tools, the trade register's answers.
- 2
- WebMCP tools
- 0
- API keys needed
- 60/min
- Free rate limit
- 62
- Countries
Get company profile
One company's registry facts by permanent ID: status, legal form, identifiers, activity codes and when the register was last observed.
get_company
Where it works
- ChatGPT desktop app
- ChatGPT Work and Codex use the tools in the app's built-in browser.
- Chrome 149+ and Edge 150+
- Available once this site joins their WebMCP origin trials. To test before then, turn on
chrome://flags/#enable-webmcp-testingin Chrome. - Browsers without WebMCP
- Pages work as usual, without tools.
Why use the tools here?
01
One contract
- The same tools as the MCP server: same names, inputs and answers, written into the page from the server's definitions.
- Answers are the free API's JSON, as its OpenAPI document describes them.
02
Your browser
- No key, no account, nothing to install. Registering the tools stores nothing and sets no cookie.
- Calls run from your own browser, within your address's 60 requests a minute.
03
Official sources
- The trade register's facts, live from the Coragrid public API.
- Nothing added, corrected or inferred: a field the register does not publish is left out.
Frequently asked questions
What is WebMCP?
A W3C Web Machine Learning Community Group draft: a web page offers tools, each with a name, description and input schema, to the AI agent in the browser, which calls them instead of clicking through the page.
How is it different from the MCP server at mcp.traderegister.fi?
The MCP server at https://mcp.traderegister.fi/mcp is an endpoint you add to an AI app once, with its own allowances. WebMCP needs no setup: the tools come with the page, and each call runs from your own browser under your address's allowance. Same tools, same inputs.
Do I need an API key or an account?
No. A Coragrid API key is for more: search by description, batch reads and limits set per key.
What does my browser send, and to whom?
Only the call itself: the search text and filters, or the company ID, from your browser to https://api.traderegister.fi, without cookies or a key. Registering the tools sends nothing, and no analytics event is sent.
Which hosts support it today?
The ChatGPT desktop app (ChatGPT Work and Codex in its built-in browser). Chrome 149+ and Edge 150+ follow once this site joins their WebMCP origin trials; until then chrome://flags/#enable-webmcp-testing turns it on in Chrome. Browsers without WebMCP show the pages without tools.
Why does the agent get a rate_limited error?
Your address has used its 60 free API requests for the minute, on this page or elsewhere. retry_after_seconds says how long to wait.
Can I use the data in my product?
Yes, on the free API's terms: in your own operations, products and services, shown as powered by Coragrid. The Terms of Service list what is not allowed.
Ask your agent.
Open TradeRegister.fi in the ChatGPT desktop app and ask for a company by name or business ID. For more than the free allowance, get a Coragrid API key.