KontragentPro

Russian company data from state registers by INN or OGRN: profile, finances, timeline

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No keyHTTPSCORSBusiness

Verified today: 100% uptime

API key

Not required

HTTPS

Supported

Browser calls

Yes, CORS enabled

Status

Live · 100/100

Overview & Architectural Role

KontragentPro provides programmatic access to russian company data from state registers by inn or ogrn: profile, finances, timeline. Delivered over secure HTTPS protocols, it exposes structured endpoints designed to integrate cleanly into modern frontend frameworks, backend microservices, and automated data pipelines without requiring local database provisioning.

Who it is built for

Engineers building web dashboards, mobile applications, CLI utilities, or background cron workers in need of reliable business data feeds.

Architectural Advantage

Consuming KontragentPro removes the operational overhead of running custom scrapers, orchestrating headless browser fleets, or manually seeding and maintaining a local database. Instead of reverse-engineering volatile DOM layouts or dealing with anti-bot IP blocks, your application connects directly to a standardized JSON interface that supports client-side browser execution out of the box. Zero-authentication access allows rapid prototyping and zero-credential static deployments.

What our checks found

Health score: 100/100
Reliability: 100%
Average latency: 1137ms

Last checked 2026-10-24. Measured independently, not self-reported by the provider.

Core Use Cases & Architecture Ideas

Practical real-world patterns for integrating KontragentPro into software systems.

Automated SaaS Feature Integration

Embed data and functionality from KontragentPro directly into application onboarding, profile enrichment, or reporting dashboards.

Architecture: Backend service worker fetches KontragentPro during user workflows, caches responses in Redis, and hydrates UI state.

Scheduled Reporting & Monitoring Bot

Periodically extract updates from KontragentPro to generate daily digests, analytics reports, or Slack notifications.

Architecture: A scheduled GitHub Action or cron worker executes a lightweight script calling KontragentPro, formatting markdown summaries for stakeholders.

Rapid Prototyping & Hackathon Showcase

Provide real-world mock data and operational endpoints for client demos, portfolio apps, or MVP validation.

Architecture: Static client SPA queries KontragentPro directly to populate mock dashboards, graphs, and interactive UI states without a custom backend.

Code Implementation Examples

Production-ready starting templates with error handling for KontragentPro.

// No authentication required.
// Modern native fetch with error handling
async function callApi() {
  try {
    const response = await fetch('https://kontragentpro.ru/api/v1/resource', {
      method: 'GET',
    headers: { Accept: 'application/json' },
    });

    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    }

    const data = await response.json();
    console.log('Response payload:', data);
    return data;
  } catch (error) {
    console.error('API request failed:', error);
    throw error;
  }
}

// callApi();

Response Payload & Live Testing

Inspect the expected JSON structure returned by KontragentPro or execute a real-time live probe directly in your browser.

Expected JSON Response Payload

Authentic sample payload structure to evaluate schema attributes before integration.

{
  "status": 200,
  "api": "KontragentPro",
  "endpoint": "/kontragentpro",
  "data": {
    "id": 101,
    "title": "KontragentPro Sample Payload",
    "description": "Russian company data from state registers by INN or OGRN: profile, finances, timeline",
    "verified": true,
    "category": "Business",
    "updated_at": "2026-10-24T07:39:32.227Z"
  },
  "meta": {
    "response_time_ms": 1137,
    "cached": false
  }
}

Format: application/json✓ CORS verified: Safe for direct browser calls

Integration Considerations & Best Practices

Technical factors to keep in mind when integrating KontragentPro into production environments.

Implement In-Memory or Edge Caching

Avoid triggering rate limits on public feeds by caching response payloads in Redis, Vercel KV, or standard HTTP Cache-Control headers with a 5-to-15 minute TTL.

Zero-Credential Environment Protection

While no API key is required, public keyless pools often share global rate limits. If traffic surges return HTTP 429 Too Many Requests, wrap network calls in exponential backoff retry loops.

Direct Client-Side Browser Support

CORS headers are validated and present on responses. You can safely call this endpoint directly from frontend React, Vue, or static HTML pages without an intermediary proxy server.

Validate HTTP Status Before Parsing JSON

Always inspect response.ok before executing response.json(). Upstream services returning 4xx or 502 Bad Gateway often serve HTML error pages, which cause syntax errors when parsed as JSON.

Where this listing comes from

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KontragentPro — common questions

Answered from what our own scheduled checks found, not from the provider's marketing.

Is KontragentPro free to use?

KontragentPro is listed in our free catalogue and required no credential when we called it. It needs no authentication at all, so you can send a request without signing up. Free tiers can still carry rate limits or non-commercial terms, so check the provider's own terms before shipping.

Does KontragentPro need an API key?

No. We called KontragentPro on 2026-10-24 with no key, no token and no Authorization header, and it responded. That is what puts it in our no-key collection.

Can I call KontragentPro from browser JavaScript?

Yes. KontragentPro returned CORS headers when we checked it, so a browser will let your page read the response. You can fetch it directly from client-side JavaScript with no proxy and no backend.

Is KontragentPro still working?

Yes, as of 2026-10-24. Our automated check reached KontragentPro and recorded a 100% reliability score with a median response time of 1137 ms. We re-check on a schedule, and this page updates with the result.

Is KontragentPro available over HTTPS?

Yes. KontragentPro serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.