# Lookproof, free: Domain WHOIS API

> Checks and diagnostics for developers and AI agents.

Lookproof's Free API key plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. Lookproof's docs list 6: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
We haven't run Lookproof through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
This plan is free. We rank 587 plans for domain WHOIS APIs by price. Half the plans cost $1.54 or less per 1,000 domains. [133 domain WHOIS API plans on our price sheet are free.](https://datacircle.dev/best-domain-whois-api.txt) [WhoisRequest's free plan](https://datacircle.dev/domain-whois-apis/whoisrequest/free-get-api-v1-lookup-whois-domain-name/llms.txt) scores highest of the free plans in our benchmark, at 96.9 out of 100.
[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.
[WhoisRequest](https://datacircle.dev/domain-whois-apis/whoisrequest/free-get-api-v1-lookup-whois-domain-name/llms.txt), [thenetworkery](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt) and [FluentEDI](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/lookproof/free
- [Domain WHOIS API in 2026: the best of 50+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://lookproof.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.lookproof.dev/v1/domain/rdap`
- API key: with the plan, on https://lookproof.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Its API docs: https://lookproof.dev/docs/api/domain-rdap?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: Lookproof (https://lookproof.dev?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: 45 other Lookproof calls

## Overage

- Units cap: hard

## Not found

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

## In their words

- Their pitch: Checks and diagnostics for developers and AI agents.

## Data

- Freshness: 5 minutes
- Keep data: no limit
- Use data: You agree to: use the service for lawful purposes only, respect rate limits, and not try to get around them, not use the service to attack, overload or harass anyone, or to disrupt the service [...] You may not resell the service or present it as your own without permission.

## Plan

- Pay: $0
- You get: 250 credits a month
- Enough for: 250 calls a month

## Rate limit

- Per second: 0.17 (10 a minute)
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain
- Method: GET
- Path: /v1/domain/rdap

## About the plan

- Plan: Free API key
- Who can get it: anyone with an email address: the key is emailed to the address in the request form

## The 20 fields the plan's answer can hold

domain, registered, LDH name, registrar, registrar IANA ID, creation date, last changed date, expiration date, days until expiry, domain status, name servers, DNSSEC signed, RDAP server, lookup status, checked at, request ID, cache hit, cache expiry time, duration, findings

## Lookproof's plans (3)

- [Lookproof, free](https://datacircle.dev/domain-whois-apis/lookproof/free/llms.txt): $0.00 per 1,000, 67% complete, 5 minutes
- [Lookproof, pay as you go](https://datacircle.dev/domain-whois-apis/lookproof/pay-as-you-go/llms.txt): $10.00 per 1,000, 67% complete, 5 minutes
- [Lookproof, contact us](https://datacircle.dev/domain-whois-apis/lookproof/contact-us/llms.txt): 67% complete, 5 minutes

## Lookproof's calls (1)

- `GET /v1/domain/rdap`: [Lookproof, free](https://datacircle.dev/domain-whois-apis/lookproof/free/llms.txt)

## Lookproof's APIs (1)

- [Lookproof Domain WHOIS API pricing, 3 plans](https://datacircle.dev/domain-whois-apis/lookproof/free/llms.txt)

## Lookproof: domain WHOIS API alternatives

[Lookproof alternatives: other domain WHOIS API providers by price](https://datacircle.dev/lookproof-alternatives.txt)

We list Lookproof's cheapest paid plan first. Next we list other providers' plans closest to Lookproof in price per 1,000 domains. Each plan in the list gives live data or data at most an hour old.

- [Lookproof, pay as you go](https://datacircle.dev/domain-whois-apis/lookproof/pay-as-you-go/llms.txt): $10.00 per 1,000, 67% complete, 5 minutes
- [DomainDrift, pay as you go, Pay per call, GET /v1/whois/{domain}](https://datacircle.dev/domain-whois-apis/domaindrift/pay-as-you-go-pay-per-call-get-v1-whois-domain/llms.txt): $10.00 per 1,000, 89% complete, 1 hour
- [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
- [WhoisXML API, $24,000 yearly, Yearly subscription 1,000,000 Queries per month, GET /whoisserver/WhoisService, WHOIS API real-time](https://datacircle.dev/domain-whois-apis/whoisxml-api/24000-yearly-yearly-subscription-1000000-queries-per-month-get-whoisserver-whoisservice-whois-api-real-time/llms.txt): $10.00 per 1,000, 78% complete, live
- [PapaCasper, pay as you go](https://datacircle.dev/domain-whois-apis/papacasper/pay-as-you-go/llms.txt): $10.00 per 1,000, 56% 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://lookproof.dev/api-keys?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/docs/api/domain-rdap?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/docs/freshness?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/docs/payments?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://lookproof.dev/tools/domain/rdap-lookup?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing