# Agent Data Tools, free: Domain WHOIS API

> WHOIS and domain lookup in one call: registrar, registration and expiry dates with the domain's age (RDAP/WHOIS), DNS records (A, AAAA, CNAME, MX, NS, TXT, CAA), DNSSEC, and email authentication (SPF, DMARC).

Agent Data Tools's Free calls plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. Agent Data Tools's docs list 5: Registrar, Created on, Expires on, Name servers, DNSSEC.
We haven't run Agent Data Tools through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
This plan is free. We rank 495 plans for domain WHOIS APIs by price. Half the plans cost $1.575 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. [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/agent-data-tools/free
- [Domain WHOIS API in 2026: the best of 20+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://agent-data-tools.revmesh2074.workers.dev/tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://agent-data-tools.revmesh2074.workers.dev/domain/whois`
- API key: not needed
- Its API docs: https://agent-data-tools.revmesh2074.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1domain~1whois
- Sold by: Agent Data Tools (https://agent-data-tools.revmesh2074.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 56%
- Registrar: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓
- DNSSEC: ✓

## Price

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

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: WHOIS and domain lookup in one call: registrar, registration and expiry dates with the domain's age (RDAP/WHOIS), DNS records (A, AAAA, CNAME, MX, NS, TXT, CAA), DNSSEC, and email authentication (SPF, DMARC).

## Data

- Freshness: live
- Keep data: no limit
- Use data: Do not use the service for anything unlawful, to harm others, or to overload it. Keep your API key private, anyone with it can spend its credits.

## Plan

- Pay: $0
- You get: 25 requests
- Enough for: 25 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: name
- Method: GET
- Path: /domain/whois

## About the plan

- Plan: Free calls
- Who can get it: anyone, 25 free successful calls per caller with no key or account (trial=1 on a GET request), at most 2,000 free calls a day in total

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

domain, exists, A records, MX records, name servers, DNSSEC validated, accepts mail, SPF policy, DMARC policy, registrable domain, registrar, registration date, expiry date, domain age in days, DNSSEC signed

## Agent Data Tools's plans (6)

- [Agent Data Tools, free](https://datacircle.dev/domain-whois-apis/agent-data-tools/free/llms.txt): $0.00 per 1,000, 56% 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
- [Agent Data Tools, $1 pack](https://datacircle.dev/domain-whois-apis/agent-data-tools/1-pack/llms.txt): $10.00 per 1,000, 56% complete, live
- [Agent Data Tools, $5 pack](https://datacircle.dev/domain-whois-apis/agent-data-tools/5-pack/llms.txt): $10.00 per 1,000, 56% complete, live
- [Agent Data Tools, $20 pack](https://datacircle.dev/domain-whois-apis/agent-data-tools/20-pack/llms.txt): $9.091 per 1,000, 56% complete, live
- [Agent Data Tools, $100 pack](https://datacircle.dev/domain-whois-apis/agent-data-tools/100-pack/llms.txt): $8.00 per 1,000, 56% complete, live

## Agent Data Tools's calls for this API (1)

- `GET /domain/whois`: [Agent Data Tools, free](https://datacircle.dev/domain-whois-apis/agent-data-tools/free/llms.txt)

## Agent Data Tools's APIs (7)

- [Agent Data Tools: tech stack API pricing, 6 plans](https://datacircle.dev/company-technology-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: domain WHOIS API pricing, 6 plans](https://datacircle.dev/domain-whois-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: email verification API pricing, 6 plans](https://datacircle.dev/validate-email-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: company enrichment API pricing, 6 plans, GET /company/lookup](https://datacircle.dev/company-enrichment-apis/agent-data-tools/free-calls-get-company-lookup/llms.txt)
- [Agent Data Tools: company enrichment API pricing, 6 plans, GET /pack/domain-intel](https://datacircle.dev/company-enrichment-apis/agent-data-tools/free-calls-get-pack-domain-intel/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /extract](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-extract/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /contents](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-contents/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /scrape](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-scrape/llms.txt)
- [Agent Data Tools: IP company lookup API pricing, 6 plans, GET /pack/ip-intelligence](https://datacircle.dev/ip-company-lookup-apis/agent-data-tools/free-calls-get-pack-ip-intelligence/llms.txt)
- [Agent Data Tools: IP company lookup API pricing, 6 plans, GET /ip/lookup](https://datacircle.dev/ip-company-lookup-apis/agent-data-tools/free-calls-get-ip-lookup/llms.txt)
- [Agent Data Tools: business verification API pricing, 6 plans, GET /lei/lookup](https://datacircle.dev/business-verification-apis/agent-data-tools/free-calls-get-lei-lookup/llms.txt)
- [Agent Data Tools: business verification API pricing, 6 plans, GET /vat/validate](https://datacircle.dev/business-verification-apis/agent-data-tools/free-calls-get-vat-validate/llms.txt)

## Agent Data Tools: domain WHOIS API alternatives

- [ViewDNS.info, $1,999 pack](https://datacircle.dev/domain-whois-apis/viewdns-info/1999-pack/llms.txt): $7.996 per 1,000, 89% complete, live
- [x402 Vending Machine, pay as you go](https://datacircle.dev/domain-whois-apis/x402-vending-machine/pay-as-you-go/llms.txt): $8.00 per 1,000, 22% complete, live
- [Whoxy, $470 pack](https://datacircle.dev/domain-whois-apis/whoxy/470-pack/llms.txt): $9.40 per 1,000, 78% complete, live
- [Osint, $99.99 pack](https://datacircle.dev/domain-whois-apis/osint/99-99-pack/llms.txt): $9.999 per 1,000, 89% 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://agent-data-tools.revmesh2074.workers.dev/credits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/guides/domain-whois-dns-lookup-api.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing