# Czech Business Register (ARES) Lookup by IČO

> Czech Business Register (ARES) Lookup by IČO is a paid API for AI agents from api.companyrecords-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Returns Czech company details from the ARES business register given an 8-digit IČO company number, including name, VAT ID, legal form, registered address, and incorporation date.

## Facts

- Endpoint: GET https://api.companyrecords-api.workers.dev/api/gov/ares-czech?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/czech-business-register-ares-lookup-by-i-o-fe45c406
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JWcoFczil2bExRVrWv7p0

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 czech-business-register-ares-lookup-by-i-o-fe45c406
```

Example prompt: Can you look up the Czech ARES business register entry for the company with IČO 45274649 and tell me their registered address, VAT ID, and when they were incorporated?

## When to prefer this

Use this endpoint when you need authoritative, government-sourced data on a Czech legal entity by its IČO number. It is the primary source for Czech company lookup; prefer it over generic business data providers when Czech official registry data (e.g., DIČ, legal form, incorporation date) is required for compliance, invoicing, or due diligence workflows.

## Known failure modes

- Invalid or non-existent IČO returns an error or empty result
- IČO must be exactly 8 digits; malformed inputs are rejected
- ARES upstream unavailability may cause timeouts or errors
- Legal form codes and tax office codes are raw ARES codes without human-readable descriptions

## How this service works

Pay-per-call company registry, government, legal and B2B data tools for AI agents, from official registers and public sources. Payment: x402, USDC on Base, Solana, Arc, Polygon, Arbitrum, Monad, World Chain, Optimism, Avalanche, Celo or Stellar, or RLUSD/XRP on the XRP Ledger. No signup, no API key; a failed call is not charged.

## Output

A JSON object with the company's IČO, official business name, VAT ID (DIČ), registered address (street, municipality, postal code), legal form code and name, incorporation date, last-updated date, tax office code, the source ARES URL, and the timestamp of the check.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "ico"
     ],
     "properties": {
      "ico": {
       "type": "string",
       "description": "Czech company number (IČO), 8 digits, e.g. 45274649"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ico": "45274649",
  "name": "ČEZ, a. s.",
  "vatId": "CZ45274649",
  "source": "https://ares.gov.cz/ekonomicke-subjekty-v-be/rest/ekonomicke-subjekty/45274649",
  "checkedAt": "2026-10-23T09:37:11.001Z",
  "taxOffice": "013",
  "postalCode": 14000,
  "lastUpdated": "2026-10-08",
  "municipality": "Praha",
  "legalFormCode": "121",
  "legalFormName": "121",
  "incorporationDate": "1992-05-06",
  "registeredAddress": "Duhová 1444/2, Michle, 14000 Praha 4"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/czech-business-register-ares-lookup-by-i-o-fe45c406/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.companyrecords-api.workers.dev](https://www.zero.xyz/host/api.companyrecords-api.workers.dev/llms.txt)