# Sirenic Czech Company Insolvency (ISIR)

> Sirenic Czech Company Insolvency (ISIR) is a paid API for AI agents from api.sirenic.eu, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns the full insolvency history of a Czech legal entity from the official ISIR register, including all proceedings, case details, and the 100 most recent events with document links.

## Facts

- Endpoint: GET https://api.sirenic.eu/v1/eu/entreprise/CZ/:ico/insolvabilite
- Price: $0.02/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-insolvency-isir-813c59ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-SoJTmsmbf4DdXpZHs8i3

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-insolvency-isir-813c59ac
```

Example prompt: Can you check the official Czech insolvency register (ISIR) for company IČO 45274649 and tell me if there are any bankruptcy or reorganisation proceedings against them?

## When to prefer this

Use this endpoint when you need authoritative, legally compulsory Czech insolvency data sourced directly from ISIR for a known legal entity (not a natural person). It is the only source for official Czech insolvency proceedings since 2008. Prefer this over general business data APIs when the specific question is insolvency status, bankruptcy, or reorganisation for Czech companies. Do not use for French companies (use the Sirenic BODACC endpoint) or for natural persons / sole traders.

## Known failure modes

- 404 entreprise_individuelle_non_servie — IČO belongs to a natural person / sole trader; payment is cancelled
- 502 — unrecognised legal form for the given IČO
- IČO not found in register — company does not exist or number is incorrect
- Malformed IČO (not 8 digits) results in validation error
- Network timeout or upstream ISIR register unavailability

## How this service works

Czech company insolvency from ISIR, the official insolvency register of Czechia, since 2008. Query: /v1/eu/entreprise/CZ/45274649/insolvabilite (8-digit IČO). Every proceeding — bankruptcy (konkurs), reorganisation (reorganizace): case number, court, status, dates, its 100 most recent events with document links. Publication is compulsory by law: no proceeding is an explicit positive answer. LEGAL PERSONS ONLY: a natural person's IČO (sole trader — most Czech IČOs) is refused, never cleared.

## Output

Returns all insolvency proceedings on record for the queried Czech legal entity: for each proceeding, the case number, court name, proceeding type (bankruptcy/konkurs or reorganisation/reorganizace), current status, key dates, and the 100 most recent events with links to official documents. If no proceedings exist, the absence itself is an explicit positive answer (company is not insolvent). Returns 404 if the IČO belongs to a natural person (sole trader), which is refused and not processed.

## 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": [
      "ico"
     ],
     "properties": {
      "ico": {
       "type": "string",
       "description": "8-digit Czech IČO. LEGAL PERSONS ONLY: a natural person's IČO (sole trader) is refused 404 entreprise_individuelle_non_servie, payment cancelled; an unrecognised legal form returns 502., e.g. 49193881"
      }
     }
    },
    "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-insolvency-isir-813c59ac/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)