# Kernel, free: Company hierarchy API

> Pass a KERN ID and get the entity category and associated hierarchies.

Kernel's Starter allocation plan for the company hierarchy API costs $0.00 per 1,000 companies. We check each provider's docs for 3 fields. Kernel's docs list 1: Parent.
We haven't run Kernel through [our company hierarchy API benchmark](https://datacircle.dev/best-company-hierarchy-api.txt) yet.
We rank 147 plans for company hierarchy APIs by price. Half the plans cost $13.46 or less per 1,000 companies. This plan and 13 others tie for the lowest price per 1,000 companies of the 147 plans. [See the best free company hierarchy API plan.](https://datacircle.dev/best-company-hierarchy-api.txt)
[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 (about $90) 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 for companies in any country.

- This page: https://datacircle.dev/company-hierarchy-apis/kernel/free
- [Company hierarchy API in 2026: the 8 best of 110+ compared](https://datacircle.dev/best-company-hierarchy-api.txt)
- Get it: https://www.kernel.ai/kernel-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Request: `POST https://api.kernel.ai/rest/v1/resolve-parent`
- API key: with the plan, on https://www.kernel.ai/kernel-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Its API docs: https://dev.kernel.ai/api-reference/endpoint/resolve-parent?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- Sold by: Kernel (https://www.kernel.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 33%
- Parent: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Resolve entity · Enrich firmographics

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Pass a KERN ID and get the entity category and associated hierarchies.

## Data

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

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: by polling or webhook

## The call

- You send: kernel_id. Optional: webhook_url
- Method: POST
- Path: /v1/resolve-parent

## About the plan

- Plan: Starter allocation
- Who can get it: builders Kernel approves after a request form (name, work email, company, what you want to build), access isn't instant

## The 34 fields the plan's answer can hold

Kernel ID, requested Kernel ID, remapped, retired at, parent Kernel ID, parent trading name, parent legal name, parent website, parent country, parent entity category, parent entity subcategory, parent reasoning, parent confidence, top parent Kernel ID, top parent trading name, top parent legal name, top parent website, top parent country, top parent entity category, top parent entity subcategory, top parent reasoning, top parent confidence, top operating parent Kernel ID, top operating parent trading name, top operating parent legal name, top operating parent website, top operating parent country, top operating parent entity category, top operating parent entity subcategory, top operating parent reasoning, top operating parent confidence, is regional subsidiary, regional scope, regional subsidiary reasoning

## Kernel's plans (1)

- [Kernel, free](https://datacircle.dev/company-hierarchy-apis/kernel/free/llms.txt): $0.00 per 1,000, 33% complete

## Kernel's calls for this API (1)

- `POST /v1/resolve-parent`: [Kernel, free](https://datacircle.dev/company-hierarchy-apis/kernel/free/llms.txt)

## Kernel's APIs (2)

- [Kernel: company hierarchy API pricing, 1 plan](https://datacircle.dev/company-hierarchy-apis/kernel/free/llms.txt)
- [Kernel: company enrichment API pricing, 1 plan, POST /v1/firmographics](https://datacircle.dev/company-enrichment-apis/kernel/free-starter-allocation-post-v1-firmographics/llms.txt)
- [Kernel: company enrichment API pricing, 1 plan, POST /v1/entity-resolution](https://datacircle.dev/company-enrichment-apis/kernel/free-starter-allocation-post-v1-entity-resolution/llms.txt)

## Kernel: company hierarchy API alternatives

- [Charity Commission, free, Register of Charities, GET /linkedcharities/{RegisteredNumber}/{suffix}](https://datacircle.dev/company-hierarchy-apis/charity-commission/free-register-of-charities-get-linkedcharities-registerednumber-suffix/llms.txt): $0.00 per 1,000, 0% complete, live
- [Edgrapi, free](https://datacircle.dev/company-hierarchy-apis/edgrapi/free/llms.txt): $0.00 per 1,000, 67% complete
- [GlobalEntity API, free](https://datacircle.dev/company-hierarchy-apis/globalentity-api/free/llms.txt): $0.00 per 1,000, 100% complete
- [Bigdata.com, free](https://datacircle.dev/company-hierarchy-apis/bigdata-com/free/llms.txt): $0.00 per 1,000, 100% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

- https://dev.kernel.ai/api-reference/endpoint/get-credits.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://dev.kernel.ai/api-reference/endpoint/get-resolve-parent.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://dev.kernel.ai/api-reference/endpoint/resolve-parent.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://dev.kernel.ai/api-reference/introduction.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://dev.kernel.ai/api-reference/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://dev.kernel.ai/guides/api-keys.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing
- https://www.kernel.ai/kernel-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-hierarchy-api-pricing