{
"status": "ok",
"service": "Subjectum — Company Registry & KYB Verification API"
}
curl --location --request GET 'https://zylalabs.com/api/13807/subjectum+company+registry++kyb+api/31658/healthz' --header 'Authorization: Bearer YOUR_API_KEY'
{
"query": {
"ico": "27074358",
"country_hint": "CZ"
},
"company": {
"name": "Asseco Central Europe, a.s.",
"ico": "27074358",
"dic": "CZ27074358",
"ic_dph": "CZ27074358",
"legal_form": "Akciová spoločnosť",
"address": {
"street": "Budějovická 778",
"city": "Praha",
"zip": "14000",
"country": "Česká republika"
},
"founded_date": "2003-08-06",
"status": "ACTIVE",
"statutory_representatives": []
},
"risk_flags": {
"newly_founded": false,
"recent_address_change": false,
"recent_representative_change": false,
"insolvency_related": false,
"risk_score": 0
},
"metadata": {
"data_source": "ARES",
"source_last_updated": "2026-09-03",
"confidence_score": 1,
"country": "CZ"
}
}
curl --location --request GET 'https://zylalabs.com/api/13807/subjectum+company+registry++kyb+api/31660/lookup-company?ico=27074358&country=CZ' --header 'Authorization: Bearer YOUR_API_KEY'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Subjectum Company Registry KYB API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime.
Subjectum is a headless REST API for Know Your Business (KYB) verification and company registry lookups across Central Europe.
Send a company registration number (IČO) and receive normalized, structured data pulled directly from official government registries — no manual searching, no scraping, no inconsistent formats across countries.
Currently supported:
- Czech Republic — via ARES (Administrativní registr ekonomických subjektů), the official Czech business registry
- Slovakia — via RPO (Register právnických osôb), the official Slovak business registry
Every response includes:
- Normalized company data: legal name, registration number, tax ID (DIČ/IČ DPH), legal form, registered address, founding date, and current legal status
- Statutory representatives where available from the source registry
- Automated risk flags: newly founded company (under 6 months), liquidation status, bankruptcy status, and confidence scoring
- Explicit data source attribution and last-updated timestamp for every lookup, so you always know exactly where the data came from and how fresh it is
Use cases: automated KYB/AML onboarding checks, vendor and supplier due diligence, B2B fraud prevention, CRM enrichment, and compliance workflows that need verified company data instead of self-reported information.
Support for Poland and Hungary is planned for a future release via commercial data partners. Requests for those countries currently return a clear, machine-readable "not yet supported" response rather than failing silently.
Built on FastAPI with strict schema validation — every response is guaranteed to match the documented structure.
The API returns normalized company data, including legal name, registration number, tax ID, legal form, registered address, founding date, and current legal status. It also provides statutory representatives and automated risk flags indicating newly founded status, liquidation, and bankruptcy.
Key fields in the response include "name," "ico," "dic," "legal_form," "address," "founded_date," "status," and "risk_flags." Each field provides essential information about the company and its legal standing.
The response is structured in a JSON format with distinct sections: "query" for input parameters, "company" for company details, "risk_flags" for risk assessments, and "metadata" for data source and confidence scoring. This organization facilitates easy parsing and utilization.
The data is sourced directly from official government registries: ARES for the Czech Republic and RPO for Slovakia. This ensures that the information is accurate and up-to-date, reflecting the latest legal statuses.
Data accuracy is maintained through direct integration with official registries, ensuring real-time updates. Each response includes a "source_last_updated" timestamp, allowing users to verify the freshness of the data.
Typical use cases include automated KYB/AML onboarding checks, vendor and supplier due diligence, B2B fraud prevention, and CRM enrichment. The API provides verified company data essential for compliance workflows.
Users can customize requests by specifying the company registration number (IČO) and optionally providing a "country_hint" to indicate the desired registry. This allows for targeted lookups in the Czech Republic or Slovakia.
If a lookup returns no results, the API will provide a clear response indicating that the company was not found. Users should implement checks for empty results to handle such scenarios gracefully in their applications.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
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