# OnchainCheck, pay as you go: Domain WHOIS API

> Everything about a domain in one call: DNS records (A, AAAA, NS, MX, TXT, CAA, CNAME), email security graded A-F (mail provider, SPF, DMARC policy, DKIM at common selectors, BIMI, with findings) and RDAP registration (registrar, created, expires, age in days, status, nameservers, DNSSEC).

OnchainCheck's x402 pay per call plan for the domain WHOIS API costs $3.00 per 1,000 domains. We check each provider's docs for 9 fields. OnchainCheck's docs list 4: Registrar, Name servers, Statuses, DNSSEC.
We haven't run OnchainCheck 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 28% 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/onchaincheck/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://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://onchaincheck.dev/domain/lookup`
- API key: not needed
- Its API docs: https://onchaincheck.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1domain~1lookup
- Sold by: OnchainCheck (https://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 44%
- Registrar: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Price

- $ per 1,000 domains: $3.00
- 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: Everything about a domain in one call: DNS records (A, AAAA, NS, MX, TXT, CAA, CNAME), email security graded A-F (mail provider, SPF, DMARC policy, DKIM at common selectors, BIMI, with findings) and RDAP registration (registrar, created, expires, age in days, status, nameservers, DNSSEC).

## 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: GET
- Path: /domain/lookup

## About the plan

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

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

domain, registrar, created, expires, updated, age in days, status, nameservers, DNSSEC, registration source, checked at

## OnchainCheck's plans (1)

- [OnchainCheck, pay as you go](https://datacircle.dev/domain-whois-apis/onchaincheck/pay-as-you-go/llms.txt): $3.00 per 1,000, 44% complete, live

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

- `GET /domain/lookup`: [OnchainCheck, pay as you go](https://datacircle.dev/domain-whois-apis/onchaincheck/pay-as-you-go/llms.txt)

## OnchainCheck's APIs (8)

- [OnchainCheck: company open jobs API pricing, 1 plan](https://datacircle.dev/company-open-job-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: email finder API pricing, 1 plan](https://datacircle.dev/find-email-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /company/enrich](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-company-enrich/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /sec/company](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-sec-company/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /vat/validate](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-vat-validate/llms.txt)
- [OnchainCheck: job postings API pricing, 1 plan, GET /jobs/new](https://datacircle.dev/job-posting-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-jobs-new/llms.txt)
- [OnchainCheck: job postings API pricing, 1 plan, GET /jobs/search](https://datacircle.dev/job-posting-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-jobs-search/llms.txt)

## OnchainCheck: domain WHOIS API alternatives

- [WhoisFreaks, $150 pack, 50,000 API Credits, POST /v2.0/bulkwhois/live](https://datacircle.dev/domain-whois-apis/whoisfreaks/150-pack-50000-api-credits-post-v2-0-bulkwhois-live/llms.txt): $3.00 per 1,000, 100% complete, live
- [AveDaris, pay as you go](https://datacircle.dev/domain-whois-apis/avedaris/pay-as-you-go/llms.txt): $3.00 per 1,000, 56% complete, live
- [Macaroon Network, pay as you go](https://datacircle.dev/domain-whois-apis/macaroon-network/pay-as-you-go/llms.txt): $3.00 per 1,000, 56% complete, live
- [NoJunk, pay as you go](https://datacircle.dev/domain-whois-apis/nojunk/pay-as-you-go/llms.txt): $3.00 per 1,000, 33% 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.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://onchaincheck.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing