# Facts402, pay as you go: Domain WHOIS API

> Use when an agent needs the age and WHOIS (RDAP) record of a domain, e.g. to spot freshly registered domains, qualify leads or vet links: registered or not, creation and expiry dates, age in days, registrar, EPP status codes, nameservers and DNSSEC. Accepts hosts like www.example.co.uk.

Facts402's x402 pay per call plan for the domain WHOIS API costs $10.00 per 1,000 domains. We check each provider's docs for 9 fields. Facts402's docs list 7: Registrar, Created on, Updated on, Expires on, Name servers, Statuses, DNSSEC.
We haven't run Facts402 through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
We rank 495 plans for domain WHOIS APIs by price. Half the plans cost $1.575 or less per 1,000 domains. This plan costs less per 1,000 domains than 9% of the 495 plans.
[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. [C99.nl's $25 yearly plan](https://datacircle.dev/domain-whois-apis/c99-nl/25-yearly/llms.txt) costs the least for 10,000 domains a month: $2.08.
[WhoisJSON](https://datacircle.dev/domain-whois-apis/whoisjson/120-monthly/llms.txt), [Enterno](https://datacircle.dev/domain-whois-apis/enterno/free-open-api/llms.txt) and [IPAddress.to](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/facts402/pay-as-you-go
- [Domain WHOIS API in 2026: the best of 20+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://api.facts402.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `POST https://api.facts402.com/domain`
- API key: not needed
- Its API docs: https://api.facts402.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1domain
- Sold by: Facts402 (https://api.facts402.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 78%
- Registrar: ✓
- Created on: ✓
- Updated on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Price

- $ per 1,000 domains: $10.00
- Per: call
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Use when an agent needs the age and WHOIS (RDAP) record of a domain, e.g. to spot freshly registered domains, qualify leads or vet links: registered or not, creation and expiry dates, age in days, registrar, EPP status codes, nameservers and DNSSEC. Accepts hosts like www.example.co.uk.

## Data

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

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain
- Method: POST
- Path: /domain

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone with a wallet paying USDC on Base (x402 v2), with no account or API key

## The 15 fields the plan's answer can hold

queried domain, domain name, TLD, registered, age in days, creation date, expiration date, updated date, registrar name, registrar IANA ID, domain status, name servers, DNSSEC, RDAP server, disclaimer

## Facts402's plans (1)

- [Facts402, pay as you go](https://datacircle.dev/domain-whois-apis/facts402/pay-as-you-go/llms.txt): $10.00 per 1,000, 78% complete, live

## Facts402's calls for this API (1)

- `POST /domain`: [Facts402, pay as you go](https://datacircle.dev/domain-whois-apis/facts402/pay-as-you-go/llms.txt)

## Facts402's APIs (4)

- [Facts402: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: company enrichment API pricing, 1 plan, POST /vat](https://datacircle.dev/company-enrichment-apis/facts402/pay-as-you-go-x402-pay-per-call-post-vat/llms.txt)
- [Facts402: company enrichment API pricing, 1 plan, POST /lei](https://datacircle.dev/company-enrichment-apis/facts402/pay-as-you-go-x402-pay-per-call-post-lei/llms.txt)

## Facts402: domain WHOIS API alternatives

- [DomainKits, $149.99 monthly, Premium, GET /whois](https://datacircle.dev/domain-whois-apis/domainkits/149-99-monthly-premium-get-whois/llms.txt): $9.999 per 1,000, 67% complete, live
- [Datakoot, pay as you go, x402 pay per call, POST /api/domain_intel](https://datacircle.dev/domain-whois-apis/datakoot/pay-as-you-go-x402-pay-per-call-post-api-domain-intel/llms.txt): $10.00 per 1,000, 78% complete, live
- [Agent Data Tools, pay as you go](https://datacircle.dev/domain-whois-apis/agent-data-tools/pay-as-you-go/llms.txt): $10.00 per 1,000, 56% complete, live
- [DomainRef, pay as you go, Pay per call, GET /v1/domain/check](https://datacircle.dev/domain-whois-apis/domainref/pay-as-you-go-pay-per-call-get-v1-domain-check/llms.txt): $10.00 per 1,000, 44% 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 2026-11-09.

- https://api.facts402.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.facts402.com/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.facts402.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.facts402.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing