# LinkCensus, free: Similar companies API

> LinkCensus is a link neighborhood lookup. Enter one domain to see related websites from a dated Common Crawl link graph and, where available, the linking domains they share.

LinkCensus's similar companies API on its Free agent key plan. It costs $0.00 per 1,000 companies. LinkCensus's docs list 2 of the 13 key fields we check: Match, Domain.
We haven't run LinkCensus through [our similar companies API benchmark](https://datacircle.dev/best-similar-companies-api.txt) yet.
This plan is free. We rank 135 plans for similar companies APIs by price. Half the plans cost $1.33 per 1,000 companies or less.
[PublicWWW's $499 monthly plan](https://datacircle.dev/similar-company-apis/publicwww/499-monthly/llms.txt) costs the least per 1,000 companies: $0.000055. PublicWWW charges for each page of results. We count 1,000,000 companies on each page to get the $0.000055 price.
[ZoomInfo's $45 pack](https://datacircle.dev/similar-company-apis/zoominfo/45-pack/llms.txt) covers any number of companies. ZoomInfo's $45 pack costs less up front than PublicWWW's $499 monthly plan.
[ScrapeAtlas](https://datacircle.dev/similar-company-apis/scrapeatlas/19-pack/llms.txt), [LeadMagic](https://datacircle.dev/similar-company-apis/leadmagic/499-monthly-professional-post-v3-companies-lookalike/llms.txt) and [Tomba](https://datacircle.dev/similar-company-apis/tomba/449-monthly/llms.txt) are the best similar companies API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/similar-company-apis/linkcensus/free
- [Similar companies API: the best of 20+ providers compared](https://datacircle.dev/best-similar-companies-api.txt)
- Get it: https://linkcensus.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing#pricing
- Request: `GET https://linkcensus.com/api/v1/neighbors/{domain}`
- API key: with the plan, on https://linkcensus.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing#pricing
- Its API docs: https://linkcensus.com/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing#neighbors
- Sold by: LinkCensus (https://linkcensus.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 15%
- Match: ✓
- Domain: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: page of 5
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Start fee: $0.00
- Also pays for: nothing else

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: LinkCensus is a link neighborhood lookup. Enter one domain to see related websites from a dated Common Crawl link graph and, where available, the linking domains they share.

## Data

- Freshness: stored
- Keep data: no limit
- Use data: Results returned through the API are link-neighborhood candidates from a dated edition, not confirmed competitors, and the No redistribution and Acceptable use terms apply to them as they do on the website. Exports and reports are for your own or your client's work. You may not redistribute them, publish them as a dataset, or resell them as a product or data feed. The underlying host embeddings, web graph, host table and search index are never provided in any form, as their Common Crawl license cannot be passed on. Automated bulk collection of results is not permitted. [...] Do not bypass rate limits, bulk scrape the service, resell raw output as a competing product, or use LinkCensus for unlawful activity.

## Plan

- Pay: $0
- You get: 5 requests a month
- Enough for: 5 pages a month
- Expires: Unused lookups do not carry over: the allowance resets at 00:00 UTC on the first day of each month

## Rate limit

- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain. Optional: edition, limit, min_shared, tld
- Method: GET
- Path: /api/v1/neighbors/{domain}

## About the plan

- Plan: Free agent key
- Who can get it: anyone

## The 23 fields the plan's answer can hold

edition, ranking mode, relationship, selection reason, query, resolved host, resolution, total results, domain, host, similarity, shared linkers, shared linker examples, TLD, rank band, explanation kind, shared linkers scope, gated, truncated, tier, quota used, quota limit, quota resets at

## LinkCensus's plans (3)

- [LinkCensus, free](https://datacircle.dev/similar-company-apis/linkcensus/free/llms.txt): $0.00 per 1,000, 15% complete, stored
- [LinkCensus, $79 pack](https://datacircle.dev/similar-company-apis/linkcensus/79-pack/llms.txt): $0.79 per 1,000, 15% complete, stored
- [LinkCensus, $149 pack](https://datacircle.dev/similar-company-apis/linkcensus/149-pack/llms.txt): $1.49 per 1,000, 15% complete, stored

## LinkCensus's calls (1)

- `GET /api/v1/neighbors/{domain}`: [LinkCensus, free](https://datacircle.dev/similar-company-apis/linkcensus/free/llms.txt)

## LinkCensus's APIs (1)

- [LinkCensus: similar companies API pricing, 3 plans](https://datacircle.dev/similar-company-apis/linkcensus/free/llms.txt)

## LinkCensus: similar companies API alternatives

- [Extruct, $49 monthly, Starter, POST /v1/companies/{company_identifier}/similar](https://datacircle.dev/similar-company-apis/extruct/49-monthly-starter-post-v1-companies-company-identifier-similar/llms.txt): $0.392 per 1,000, 46% complete, stored
- [Tomba, $49 monthly](https://datacircle.dev/similar-company-apis/tomba/49-monthly/llms.txt): $0.784 per 1,000, 15% complete, stored
- [The Companies API, $2,950 yearly](https://datacircle.dev/similar-company-apis/the-companies-api/2950-yearly/llms.txt): $0.983 per 1,000, 92% complete, stored
- [Klazify, $23,700 yearly](https://datacircle.dev/similar-company-apis/klazify/23700-yearly/llms.txt): $0.988 per 1,000, 8% 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 2026-11-06.

- https://linkcensus.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing#pricing
- https://linkcensus.com/account/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://linkcensus.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://linkcensus.com/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://linkcensus.com/docs/usage?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://linkcensus.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing