# fourzerotwo, free: Domain WHOIS API

> Registrar, created, expiry, age, status codes, nameservers and DNSSEC.

fourzerotwo's Free key plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. fourzerotwo's docs list 6: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
You get up to 90 calls a month.
We haven't run fourzerotwo through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
This plan is free. We rank 607 plans for domain WHOIS APIs by price. Half the plans cost $1.667 or less per 1,000 domains. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[Searchwire's $10 pack](https://datacircle.dev/domain-whois-apis/searchwire/10-pack/llms.txt) is the cheapest paid plan per 1,000 domains. Searchwire's domain WHOIS API costs nothing beyond the plan price. [UAPI's CNY 4.90 pack](https://datacircle.dev/domain-whois-apis/uapi/cny-4-90-pack/llms.txt) costs the least for 10,000 domains a month: about $0.73.
[thenetworkery](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt), [FluentEDI](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt) and [DomainDetails](https://datacircle.dev/domain-whois-apis/domaindetails/9-99-monthly-alerts-get-api-rdap/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/fourzerotwo/free
- [Domain WHOIS API in 2026: the best of 30+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://fourzerotwo.si/v1/domains/facts`
- API key: with the plan, on https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Its API docs: https://fourzerotwo.si/apis/domains/facts?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: fourzerotwo (https://fourzerotwo.si?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 67%
- Registrar: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Price

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

## Charges

- Also pays for: from the same budget: 529 other fourzerotwo calls: 500 a day

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Registrar, created, expiry, age, status codes, nameservers and DNSSEC.

## Data

- Freshness: live
- Keep data: no API terms
- Use data: Keep the attribution when you show the data.

## Plan

- Pay: $0
- Enough for: 90 calls a month

## Rate limit

- Per day: 3
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain
- Method: GET
- Path: /v1/domains/facts

## About the plan

- Plan: Free key
- Who can get it: anyone with an email address

## The 7 fields the plan's answer can hold

registrar, created date, expires date, domain age, status, name servers, DNSSEC

## fourzerotwo's plans (5)

- [fourzerotwo, free](https://datacircle.dev/domain-whois-apis/fourzerotwo/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [fourzerotwo, pay as you go](https://datacircle.dev/domain-whois-apis/fourzerotwo/pay-as-you-go/llms.txt): $2.00 per 1,000, 67% complete, live
- [fourzerotwo, $5 pack](https://datacircle.dev/domain-whois-apis/fourzerotwo/5-pack/llms.txt): $2.00 per 1,000, 67% complete, live
- [fourzerotwo, $20 pack](https://datacircle.dev/domain-whois-apis/fourzerotwo/20-pack/llms.txt): $2.00 per 1,000, 67% complete, live
- [fourzerotwo, $50 pack](https://datacircle.dev/domain-whois-apis/fourzerotwo/50-pack/llms.txt): $2.00 per 1,000, 67% complete, live

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

- `GET /v1/domains/facts`: [fourzerotwo, free](https://datacircle.dev/domain-whois-apis/fourzerotwo/free/llms.txt)

## fourzerotwo's APIs (8)

- [fourzerotwo: business verification API pricing, 5 plans](https://datacircle.dev/business-verification-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: company discovery API pricing, 5 plans](https://datacircle.dev/company-discovery-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: company enrichment API pricing, 5 plans](https://datacircle.dev/company-enrichment-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: domain WHOIS API pricing, 5 plans](https://datacircle.dev/domain-whois-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: phone validation API pricing, 5 plans](https://datacircle.dev/validate-phone-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: web scraping API pricing, 5 plans](https://datacircle.dev/web-scraping-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: IP company lookup API pricing, 5 plans, GET /v1/ip-geolocation/batch](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-batch/llms.txt)
- [fourzerotwo: IP company lookup API pricing, 5 plans, GET /v1/ip-geolocation/lookup](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-lookup/llms.txt)
- [fourzerotwo: IP company lookup API pricing, 5 plans, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-domains-ip-owner/llms.txt)
- [fourzerotwo: IP company lookup API pricing, 5 plans, GET /v1/ip-geolocation/asn](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-asn/llms.txt)

## fourzerotwo: domain WHOIS API alternatives

- [WhoisFreaks, $2,000 pack, 1,000,000 API Credits, POST /v2.0/bulkwhois/live](https://datacircle.dev/domain-whois-apis/whoisfreaks/2000-pack-1000000-api-credits-post-v2-0-bulkwhois-live/llms.txt): $2.00 per 1,000, 100% complete, live
- [SiteCheck, pay as you go, x402 pay per call, GET /api/domain](https://datacircle.dev/domain-whois-apis/sitecheck/pay-as-you-go-x402-pay-per-call-get-api-domain/llms.txt): $2.00 per 1,000, 89% complete, live
- [Genexxis, pay as you go, x402 pay per call, GET /whois-bulk](https://datacircle.dev/domain-whois-apis/genexxis/pay-as-you-go-x402-pay-per-call-get-whois-bulk/llms.txt): $2.00 per 1,000, 78% complete, live
- [Whoxy, $10 pack](https://datacircle.dev/domain-whois-apis/whoxy/10-pack/llms.txt): $2.00 per 1,000, 78% complete, live

## 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://fourzerotwo.si/apis/domains/facts?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://fourzerotwo.si/catalog.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://fourzerotwo.si/credits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://fourzerotwo.si/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://fourzerotwo.si/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing