# Mailrook, free: Company enrichment API

> Everything Behind a Domain, in One Call. What the company does — sector, niche, who it sells to and how, read from its own homepage — plus registrar and registrant, domain age, MX and nameserver records, SPF and DMARC policy, catch-all status and detected tech stack. Structured JSON from a single request.

Mailrook's company enrichment API on its Free forever plan, $0.00 per 1,000 companies. 5 of the 13 key fields: Industry, Type and status, Employees, Social profiles, Headquarters.

- This page: https://datacircle.dev/company-enrichment-apis/mailrook/free
- Get it: https://mailrook.com
- Its API docs: https://mailrook.com/docs/api
- Sold by: Mailrook (https://mailrook.com)
- Checked: 2026-10-20

## In the answer

- Completeness: 38%
- Industry: ✓
- Type and status: ✓
- Employees: ✓
- Social profiles: ✓
- Headquarters: ✓

## Price

- $ per 1,000: $0.00
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Repeat free: never
- Per: call
- Also pays for: from the same budget: Validate a single email · Submit a batch of emails · Upload a file for batch validation

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Everything Behind a Domain, in One Call. What the company does — sector, niche, who it sells to and how, read from its own homepage — plus registrar and registrant, domain age, MX and nameserver records, SPF and DMARC policy, catch-all status and detected tech stack. Structured JSON from a single request.

## Data

- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 25 credits a day
- Enough for: about 12 calls a day
- Expires: resets daily at midnight UTC

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: input. Optional: fields, include
- Method: GET
- Path: /v1/enrich/{input}

## About the plan

- Plan: Free forever
- Who can get it: anyone

## The 58 fields the plan's answer can hold

domain, website URL, website title, website reachable, crawl blocked, CMS, e-commerce platform, tracking pixels, analytics tools, marketing tools, chat widgets, affiliate tools, email security, Twitter handle, Instagram handle, Facebook handle, YouTube handle, TikTok handle, LinkedIn handle, GitHub handle, name, industry, size range, company type, founded year, city, state, country code, category level, category source, sector, sector label, niche, niche label, customer type, customer type label, business model tags, business model tag labels, category confidence, category reason, category reason label, category checked at, taxonomy version, category detail, has SPF, has DMARC, nameserver hosts, A record IP, ASN, ASN organization, registrar, registrant organization, registrant country, domain created at, domain expires at, domain age days, response code, response message

## Mailrook's plans (6)

- [Mailrook, free](https://datacircle.dev/company-enrichment-apis/mailrook/free/llms.txt): $0.00 per 1,000, 38% complete
- [Mailrook, $39 pack](https://datacircle.dev/company-enrichment-apis/mailrook/39-pack/llms.txt): $7.80 per 1,000, 38% complete
- [Mailrook, $29 monthly](https://datacircle.dev/company-enrichment-apis/mailrook/29-monthly/llms.txt): $7.733 per 1,000, 38% complete
- [Mailrook, $79 monthly](https://datacircle.dev/company-enrichment-apis/mailrook/79-monthly/llms.txt): $3.95 per 1,000, 38% complete
- [Mailrook, $199 monthly](https://datacircle.dev/company-enrichment-apis/mailrook/199-monthly/llms.txt): $2.653 per 1,000, 38% complete
- [Mailrook, contact us](https://datacircle.dev/company-enrichment-apis/mailrook/contact-us/llms.txt): 38% complete

## Mailrook's calls (1)

- `GET /v1/enrich/{input}`: [Mailrook, free](https://datacircle.dev/company-enrichment-apis/mailrook/free/llms.txt)

## Similar plans of other providers

- [PredictLeads, free, 100 API credits Free, GET /extended_companies/{id_or_domain}](https://datacircle.dev/company-enrichment-apis/predictleads/free-100-api-credits-free-get-extended-companies-id-or-domain/llms.txt): $0.00 per 1,000, 85% complete, 2 weeks
- [People Data Labs, free, Free, POST /v5/company/enrich/bulk](https://datacircle.dev/company-enrichment-apis/people-data-labs/free-free-post-v5-company-enrich-bulk/llms.txt): $0.00 per 1,000, 69% complete, 1 month
- [Nymeria, free](https://datacircle.dev/company-enrichment-apis/nymeria/free/llms.txt): $0.00 per 1,000, 46% complete, stored
- [Openmart, free, Free, POST /api/v1/enrich_company](https://datacircle.dev/company-enrichment-apis/openmart/free-free-post-api-v1-enrich-company/llms.txt): $0.00 per 1,000, 38% complete, 1 month

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

- https://mailrook.com
- https://mailrook.com/docs/api
- https://mailrook.com/domain-enrichment-api
- https://mailrook.com/email-validation-api
- https://mailrook.com/legal/privacy
- https://mailrook.com/legal/terms