# Transparent Data, contact us: Company hierarchy API

> company connections (with other companies & physical persons) from KRS in JSON

Transparent Data's company hierarchy API on its Get your API plan. It returns 1 of the 3 key fields we check: Company.
We haven't run Transparent Data through [our company hierarchy API benchmark](https://datacircle.dev/best-company-hierarchy-api.txt) yet.
Transparent Data gives this plan's price on request. We rank 50 plans for company hierarchy APIs by price. Half the plans cost $25.375 per 1,000 companies or less.
[DanskCVRAPI's DKK 599 monthly plan](https://datacircle.dev/company-hierarchy-apis/danskcvrapi/dkk-599-monthly/llms.txt) is the cheapest paid plan per 1,000 companies: $0.045. DanskCVRAPI's plan covers companies in Denmark only.
[GlobalEntity API's €59 monthly plan](https://datacircle.dev/company-hierarchy-apis/globalentity-api/59-monthly/llms.txt) covers any number of companies in 54 countries only. GlobalEntity API's €59 monthly plan costs less up front than DanskCVRAPI's DKK 599 monthly plan.
[DiscoLike](https://datacircle.dev/company-hierarchy-apis/discolike/99-monthly/llms.txt), [Bigdata.com](https://datacircle.dev/company-hierarchy-apis/bigdata-com/50-monthly/llms.txt) and [Magellan Data](https://datacircle.dev/company-hierarchy-apis/magellan-data/375-pack-25000-credits-post-v1-corporate-families/llms.txt) are the best company hierarchy API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/company-hierarchy-apis/transparent-data/contact-us
- [Company hierarchy API: 5 providers compared](https://datacircle.dev/best-company-hierarchy-api.txt)
- Get it: https://transparentdata.pl/en/api-company-information-poland?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Request: `POST https://api.transparentdata.pl/{key}/add`
- API key: with the plan, on https://transparentdata.pl/en/api-company-information-poland?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Its API docs: https://apidoc.transparentdata.pl/dataintegrator.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Sold by: Transparent Data (https://transparentdata.pl?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 33%
- Company: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: company connections (with other companies & physical persons) from KRS in JSON

## Data

- Countries: Poland
- Full family tree: no
- Keep data: no API terms
- Use data: no API terms

## Speed

- Answer: by polling

## The call

- You send: source "company_relations", method "data", params.tax_number. Optional: params.depth
- Method: POST
- Path: /{key}/add

## About the plan

- Plan: Get your API
- Who can get it: anyone who sends its contact form: an offer and test access follow

## The 20 fields the plan's answer can hold

company name, KRS number, NIP, REGON number, legal form, share capital, registered address, related company name, related company KRS number, related company NIP, related company REGON number, related company legal form, related company share capital, related company address, related person name, related person birth date, relation type, relation date, relation depth, register type

## Transparent Data's plans (1)

- [Transparent Data, contact us](https://datacircle.dev/company-hierarchy-apis/transparent-data/contact-us/llms.txt): 33% complete

## Transparent Data's calls for this API (1)

- `POST /{key}/add`: [Transparent Data, contact us](https://datacircle.dev/company-hierarchy-apis/transparent-data/contact-us/llms.txt)

## Transparent Data's APIs (3)

- [Transparent Data: business verification API pricing, 1 plan](https://datacircle.dev/business-verification-apis/transparent-data/contact-us/llms.txt)
- [Transparent Data: company hierarchy API pricing, 1 plan](https://datacircle.dev/company-hierarchy-apis/transparent-data/contact-us/llms.txt)
- [Transparent Data: company enrichment API pricing, 1 plan, POST /{key}/add, TD - CEIDG JSON](https://datacircle.dev/company-enrichment-apis/transparent-data/contact-us-get-your-api-post-key-add-td-ceidg-json/llms.txt)
- [Transparent Data: company enrichment API pricing, 1 plan, POST /{key}/add, TD - KRS CEIDG REGON JSON](https://datacircle.dev/company-enrichment-apis/transparent-data/contact-us-get-your-api-post-key-add-td-krs-ceidg-regon-json/llms.txt)
- [Transparent Data: company enrichment API pricing, 1 plan, POST /{key}/add, TD - Pełny odpis KRS JSON 2.0](https://datacircle.dev/company-enrichment-apis/transparent-data/contact-us-get-your-api-post-key-add-td-pe-ny-odpis-krs-json-2-0/llms.txt)
- [Transparent Data: company enrichment API pricing, 1 plan, POST /{key}/add, TD - Raport Prześwietl JSON](https://datacircle.dev/company-enrichment-apis/transparent-data/contact-us-get-your-api-post-key-add-td-raport-przeswietl-json/llms.txt)
- [Transparent Data: company enrichment API pricing, 1 plan, POST /{key}/add, TD - REGON JSON](https://datacircle.dev/company-enrichment-apis/transparent-data/contact-us-get-your-api-post-key-add-td-regon-json/llms.txt)

## Transparent Data: company hierarchy API alternatives

- [UC, contact us](https://datacircle.dev/company-hierarchy-apis/uc/contact-us/llms.txt): 33% complete, 1 day
- [FactSet, contact us, Personalized proposal, GET /factset-entity/v1/entity-structures](https://datacircle.dev/company-hierarchy-apis/factset/contact-us-personalized-proposal-get-factset-entity-v1-entity-structures/llms.txt): 33% complete
- [Infocredit Group, contact us, API4ALL access, GET /a4a/3.0/api/report/structure/code/{code}](https://datacircle.dev/company-hierarchy-apis/infocredit-group/contact-us-api4all-access-get-a4a-3-0-api-report-structure-code-code/llms.txt): 33% complete, stored
- [Kontur.Focus, contact us, Legal entity links (Связи юридического лица), GET /api3/beneficialOwners](https://datacircle.dev/company-hierarchy-apis/kontur-focus/contact-us-legal-entity-links-get-api3-beneficialowners/llms.txt): 33% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

- https://apidoc.transparentdata.pl/dataintegrator.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://transparentdata.pl/en?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://transparentdata.pl/en/api-company-information-poland?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://transparentdata.pl/en/api-company-information-poland/krs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing