# Kadec0, pay as you go, x402 pay per call, GET /v1/domain-age-check: Domain WHOIS API

> Domain age checker. Returns when a domain was registered, its age in days and years, expiry and last-updated dates, and the registrar, read from the authoritative registry over RDAP with a WHOIS fallback, plus a newly-registered flag and a high, medium, or low risk indicator.

Kadec0's x402 pay per call plan for the domain WHOIS API costs $30.00 per 1,000 domains. We check each provider's docs for 9 fields. Kadec0's docs list 4: Registrar, Created on, Updated on, Expires on.
We haven't run Kadec0 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 2% 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/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check
- [Domain WHOIS API in 2026: the best of 20+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.kadec0.xyz/v1/domain-age-check`
- API key: not needed
- Its API docs: https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/default/handler_v1_domain_age_check_get
- Sold by: Kadec0 (https://api.kadec0.xyz?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 44%
- Registrar: ✓
- Created on: ✓
- Updated on: ✓
- Expires on: ✓

## Price

- $ per 1,000 domains: $30.00
- Per: call
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Domain age checker. Returns when a domain was registered, its age in days and years, expiry and last-updated dates, and the registrar, read from the authoritative registry over RDAP with a WHOIS fallback, plus a newly-registered flag and a high, medium, or low risk indicator.

## Data

- 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: GET
- Path: /v1/domain-age-check

## About the plan

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

## The 11 fields the plan's answer can hold

domain, registrar, creation date, expiry date, updated date, age in days, age in years, newly registered, risk indicator, risk basis, record source

## Kadec0's plans (1)

- [Kadec0, pay as you go, x402 pay per call, GET /v1/domain-age-check](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check/llms.txt): $30.00 per 1,000, 44% complete

## Kadec0's calls for this API (3)

- `GET /v1/whois-bulk`: [Kadec0, pay as you go, x402 pay per call, GET /v1/whois-bulk](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-whois-bulk/llms.txt)
- `GET /v1/domain-age-check`: [Kadec0, pay as you go, x402 pay per call, GET /v1/domain-age-check](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check/llms.txt)
- `GET /v1/domain-info`: [Kadec0, pay as you go, x402 pay per call, GET /v1/domain-info](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-info/llms.txt)

## Kadec0's APIs (9)

- [Kadec0: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: Hacker News search API pricing, 1 plan](https://datacircle.dev/hacker-news-search-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: related keywords API pricing, 1 plan](https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-batch](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-batch/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-multi](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-multi/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-read](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-read/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/domain-age-check](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check/llms.txt)

## Kadec0: domain WHOIS API alternatives

- [SupaMarketers, $149 monthly](https://datacircle.dev/domain-whois-apis/supamarketers/149-monthly/llms.txt): $29.80 per 1,000, 0% complete
- [Osint, $29.99 pack](https://datacircle.dev/domain-whois-apis/osint/29-99-pack/llms.txt): $29.99 per 1,000, 89% complete, live
- [Qonoro, pay as you go](https://datacircle.dev/domain-whois-apis/qonoro/pay-as-you-go/llms.txt): $30.00 per 1,000, 44% complete
- [Glowe Websites, pay as you go](https://datacircle.dev/domain-whois-apis/glowe-websites/pay-as-you-go/llms.txt): $30.00 per 1,000, 33% complete

## 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.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.kadec0.xyz/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.kadec0.xyz/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing