Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@czid-mcp Is company 27082440 a VAT payer?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
Czech entity-registry tools for AI agents over the Model Context Protocol: company lookup, VAT (DPH) status, insolvency/registry snapshot, RÚIAN address standardization, Czech identifier validation.
Data source: official ARES REST API (ares.gov.cz) — Czech open data, CC BY 4.0 (ND). No API key needed to use this service.
Use the hosted endpoint — no install, no local process:
https://czid.casuyi.com/mcpMCP 2026-07-28 (2025-era clients supported too), stateless Streamable HTTP, works with Claude Code, Claude Desktop, Cursor, VS Code, and any MCP client.
Tool | What it does |
| ARES basic register: name, legal form, registered address, NACE, DIČ, data box, active registers |
| RZP register: VAT payer (plátce DPH) yes/no, effective since, tax office. Batch up to 20 IČOs/DIČs |
| KYC-style snapshot: active/cancelled, register presence (VR, RZP, insolvency RS, RCNS, SZR…), insolvency record |
| Company name search (prefix, case-insensitive) → IČOs + addresses |
| Free-text Czech address → RÚIAN-standardized (KOD ADM, PSC, city part) |
| Offline checksum validation: IČO, DIČ, IBAN, variable symbol |
id accepts IČO (8 digits) or DIČ (CZ + 10 digits).
Related MCP server: cz-agents-mcp
Claude Code
claude mcp add czid --transport http https://czid.casuyi.com/mcpClaude Desktop — Settings → Connectors → Add custom connector → URL above.
Cursor / VS Code (Copilot) / Windsurf / any mcpServers JSON client
{
"mcpServers": {
"czid": { "type": "http", "url": "https://czid.casuyi.com/mcp" }
}
}All tools are completely free. No API key, no payment, no signup.
A free service by Casuyi.
curl -sS -X POST https://czid.casuyi.com/mcp \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"company_lookup","arguments":{"id":"27082440"}}}'→ Alza.cz a.s., Jankovcova 1522/53, Praha … (reply is one SSE data: line — see examples).
examples/quickstart.md — every call shape: list tools, initialize, tool calls
examples/clients.md — connect from Claude Code / Desktop / Cursor / any MCP client
clients/python.py — minimal Python client (stdlib only)
clients/typescript.ts — minimal TypeScript client (fetch only)
Legal-entity public data only (ARES open data). Where the register publishes a DIČ derived from a birth number (OSVČ), this service surfaces exactly what the register publishes — no additional personal data. Every response includes the source and its datumAktualizace per the CC BY 4.0 (ND) license. The service keeps no request logs tied to identities; no accounts or identities are stored.
Open an issue for: custom fields, uptime questions.
This server cannot be deployed
Czech ARES company registry: VAT, insolvency, RÚIAN addresses, IČO/DIČ checks. All free, no auth.
Czech business register (ARES) — look up any Czech company or sole trader by IČO or by name, from…
Czech & Slovak business registry — company lookup by IČO, name, legal form, VAT. Official ARES.
Czech & EU due diligence in one call — facts, insolvency, sanctions, VAT, risk score, UBO chain.