# Profile of a Czech company

A country-specific constraint to know before integrating: we serve legal persons only. An IČO identifier can belong to a natural person trading in their own name, and in that case the route refuses — deliberately, because serving a natural person's identity would mean publishing personal data.

## What the route returns

Catalogue description, exactly as agents read it:

**Official Czech company registry lookup (ARES — register of economic subjects, Ministry of Finance of Czechia). Query: /v1/eu/entreprise/CZ/45274649 (8-digit IČO / ICO identifier). Returns legal name, legal form, normalized status, incorporation date, registered office and the DIČ (DIC) VAT number — Czech company data live from ARES, the official register of companies in Czechia. Unified JSON schema shared by all Sirenic European company profiles.**

## Expected identifier

Czech IČO identifier. A **natural person's** IČO is refused.

> ⚠️ A wrongly formatted identifier returns `400` and is **not billed** — but it costs you a round trip. It is the leading cause of failed calls on the foreign routes.

## Extract from a genuinely paid response

Dated snapshot from 2026-07-29, truncated to one item per array. It is not live data. The full extract is served **free of charge** from [the samples surface](https://api.sirenic.eu/exemples/), and the schema from the OpenAPI document.

```
{
 "pays": "CZ",
 "registre": "ARES — Registr ekonomických subjektů (MF ČR)",
 "id_national": "45274649",
 "denomination": "ČEZ, a. s.",
 "forme_juridique": {
  "code": "121",
  "libelle": null
 },
 "statut": "actif",
 "statut_detail": null,
 "date_creation": "1992-05-06",
 "adresse_siege": {
  "adresse": "Duhová 1444/2, Michle, 14000 Praha 4",
  "code_postal": "14000",
  "ville": "Praha",
  "pays": "CZ"
 },
 "identifiants": {
  "tva": "CZ45274649",
  "lei": null
 },
 "lien_registre": "https://ares.gov.cz/ekonomicke-subjekty?ico=45274649",
 "data_freshness": "ARES temps réel (cache 24 h)",
 "source": "Registres officiels : Brønnøysundregistrene (NO, NLOD), e-Business Register (EE, CC-BY 4.0), Uzņēmumu reģistrs (LV), KBO/BCE (BE), CVR (DK), Companies House (GB, OGL), ARES (CZ), Register právnických osôb (SK, CC-BY 4.0), PRH/YTJ (FI, CC-BY 4.0), Krajowy Rejestr Sądowy (PL), Zefix (CH, OGD), Bolagsverket (SE), GLEIF (CC0)",
 "disclaimer": "Données rediffusées telles que publiées par les registres officiels, dans un schéma unifié ; `statut` est une normalisation en 3 valeurs, le libellé source est conservé dans `statut_detail`. / Official register data as published, unified schema; `statut` is a 3-value normalization."
}
```

## Price and billing

Price: **$0.01**. The authoritative amount is the one in the `402` quote returned by the route itself — not this text, which derives from the same grid but is still just a page.

An error response **cancels the payment**: a `400`, `404` or `503` is never billed. An upstream outage closes the route with a `503` rather than serving a degraded response.

## Calling the route

```
# 1. Le devis, sans rien payer : la route répond 402 avec son montant
curl -i https://api.sirenic.eu/v1/eu/entreprise/CZ/{id}

# 2. L'appel réglé — le client x402 paie le devis et rejoue la requête
npx x402-fetch https://api.sirenic.eu/v1/eu/entreprise/CZ/{id}

# 3. Ou en MCP, dans Claude Code / Cursor / un agent
claude mcp add --transport http sirenic https://api.sirenic.eu/mcp
```

## What this route does not do

**Live** query at the register: always current, but dependent on its availability. A register outage returns `503` and the call is not billed — never a degraded response.

## Neighbouring routes

- `/v1/eu/entreprise/CZ/{ico}/insolvabilite` — $0.02
- `/v1/eu/recherche` — $0.003

## How you pay

Every route is paid **per call**, in USDC or EURC on the Base network, over the x402 protocol: no account to create, no API key, no subscription. The first call returns a `402` quote your client settles, then replays the call. A failed call is never billed.

Would you rather have a euro invoice and prepaid credits? That is **in preparation**, and we will not announce a date until it is open. Write to [contact@sirenic.eu](mailto:contact@sirenic.eu?subject=Euro%20credit%20packs) and we will let you know when it opens.

Paid responses are **Ed25519-signed**: you can later prove what was served to you, and when. The whole catalogue is free to read in the [OpenAPI document](https://api.sirenic.eu/openapi.json) and in [llms.txt](https://api.sirenic.eu/llms.txt).

**One call, end to end**

```
# Client x402 (npm) — le devis 402 est réglé et l'appel rejoué automatiquement
npx x402-fetch https://api.sirenic.eu/v1/entreprise/552032534

# Ou en MCP, dans Claude Code / Cursor
claude mcp add --transport http sirenic https://api.sirenic.eu/mcp
```

## Routes used and pricing

| Route | Price | What it returns |
| --- | --- | --- |
| `/v1/eu/entreprise/CZ/{id}` | $0.01 | Official Czech company registry lookup (ARES — register of economic subjects, Ministry of Finance of Czechia). Query: /v1/eu/entreprise/CZ/45274649 (8-digit IČO / ICO identifier). Returns legal name, legal form, normalized status, incorporation date, registered office and the DIČ (DIC) VAT number — Czech company data live from ARES, the official register of companies in Czechia. Unified JSON schema shared by all Sirenic European company profiles. |

## Take it further

- [See a real response (free)](https://api.sirenic.eu/exemples/eu-entreprise-CZ-id.json)
- [Get the quote for /v1/eu/entreprise/CZ/{id}](https://api.sirenic.eu/v1/eu/entreprise/CZ/{id})
- [Get notified about euro packs](mailto:contact@sirenic.eu?subject=Euro%20credit%20packs)

## Read next

- [Querying European company registers](https://api.sirenic.eu/en/use-cases/european-company-data-thirteen-official-registers-one-schema)

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Volume figures on this page were measured in our database on 2026-08-19. They are dated snapshots, not live counters.

Full catalogue : https://api.sirenic.eu/