Czech Company Registry (ARES) Tools MCP Server

by appvantagelabs2-a11y Your server? Claim it

answering

Czech Company Registry (ARES) Tools is answering right now. Last checked 4 min ago. It exposes 6 tools.

Czech ARES company registry: VAT, insolvency, RÚIAN addresses, IČO/DIČ checks. All free, no auth.

Uptime history 68 hours of history

68 hours agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

294 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 7

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 16 September 2026. No other catalogue keeps this.

16 Sep 6 tools changed the parameters they ask for address_check, check_vat, company_lookup and 3 more

16 Sep a tool changed version

Nothing serious here today

Today is the operative word: we check Czech Company Registry (ARES) Tools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add czid --transport http https://czid.casuyi.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "czid": {
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.czid]
url = "https://czid.casuyi.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "czid": {
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "czid": {
      "url": "https://czid.casuyi.com/mcp"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

company

company_lookup

Basic register (ARES) lookup: name, legal form, registered address, NACE, data-box, VAT DIČ. Input: IČO (8 digits) or DIČ (CZ+10).

search_company

Company-name search in ARES (prefix match, case-insensitive; no wildcards). Returns IČOs + names + addresses for further lookups.

address

address_check

Free-text Czech address -> RÚIAN-standardized (full KOD ADM, codes for obec/část/ulice, correct PSC).

entity

entity_status

KYC-style snapshot: active/cancelled, which registers the entity appears in (VR, RZP, NRPZS, RS insolvency, RCNS, SZR...), plus insolvency-register record if present.

validate

validate_cz

Checksum/format validation: IČO (mod-11), DIČ (CZ+IČO or birth number), IBAN (mod-97, CZ-specific), variable symbol. Pure local, no network.

vat

check_vat

Authoritative plátce-DPH status from RZP register: payer yes/no, effective from, tax office, trade licences. Use before issuing/czech invoicing. Batch up to 20 IČOs.

Endpoints

URL	Transport	State	Latency	Checked
https://czid.casuyi.com/mcp	streamable-http	answering	396 ms	4 min ago

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Czech Company Registry (ARES) Tools — questions

Answers built from our own checks of this server.

What can Czech Company Registry (ARES) Tools do?

It exposes 6 tools, read directly from the server on our last check. Among them: address_check, check_vat, company_lookup, entity_status, search_company, validate_cz. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Czech Company Registry (ARES) Tools working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 294 ms. The bar chart above shows every period we have measured.

How do I connect Czech Company Registry (ARES) Tools?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Czech Company Registry (ARES) Tools need an API key?

No. Czech Company Registry (ARES) Tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Czech Company Registry (ARES) Tools?

It answers our handshake in 294 ms on average, which is faster than 51% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.