# Sirenic Czech Company Registry Lookup (ARES)

> Sirenic Czech Company Registry Lookup (ARES) is a paid API for AI agents from api.sirenic.eu, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Looks up a Czech company by its 8-digit IČO number against the official ARES registry, returning legal name, form, status, incorporation date, registered office, and VAT number (DIČ).

## Facts

- Endpoint: GET https://api.sirenic.eu/v1/eu/entreprise/CZ/:id
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sirenic-czech-company-registry-lookup-ares-54e697e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-8yq3-eTxzmQsbvp1wXWX

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sirenic-czech-company-registry-lookup-ares-54e697e4
```

Example prompt: Can you look up the Czech company with IČO 45274649 from the official ARES registry and tell me its legal name, current status, registered address, and VAT number?

## When to prefer this

Use this endpoint when you need authoritative, live Czech company data directly from the official Ministry of Finance ARES registry. Prefer this over generic business data aggregators when legal accuracy is required — e.g. for KYC, invoice validation, supplier verification, or compliance workflows involving Czech entities. It provides a normalized, unified JSON schema consistent with Sirenic's wider European company data platform.

## Known failure modes

- Invalid IČO format (not exactly 8 digits) — returns error
- Company not found in ARES for the given IČO — returns not found response
- ARES upstream service unavailable — may return timeout or 502
- Payment failure via x402 protocol — request not processed

## How this service works

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.

## Output

A unified JSON object containing the company's legal name, legal form, normalized status (e.g. active/inactive), incorporation date, registered office address, and DIČ VAT number — sourced live from the Czech ARES register.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "Czech IČO, exactly 8 digits (ARES — Registr ekonomických subjektů, MF ČR)., e.g. 45274649"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sirenic-czech-company-registry-lookup-ares-54e697e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sirenic.eu](https://www.zero.xyz/host/api.sirenic.eu/llms.txt)