# Agent Toolbox, free: Domain WHOIS API

> Domain registration data from RDAP (the successor of WHOIS): registrar, creation, expiry and update dates, status codes, nameservers and DNSSEC.

Agent Toolbox's Free plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. Agent Toolbox's docs list 7: Registrar, Created on, Updated on, Expires on, Name servers, Statuses, DNSSEC.
Agent Toolbox limits how many calls you get but gives no number.
In [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt), this plan scores 81.2 out of 100. Agent Toolbox ranks 5th of 24 providers.
We rank 495 plans for domain WHOIS APIs by price. Half the plans cost $1.575 or less per 1,000 domains. This plan and 18 others tie for the lowest price per 1,000 domains of the 495 plans. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[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-toolbox/free
- [Domain WHOIS API in 2026: the best of 20+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://agent-toolbox.zafermemon87.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://agent-toolbox.zafermemon87.workers.dev/free/whois`
- API key: not needed
- Its API docs: https://agent-toolbox.zafermemon87.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: Agent Toolbox (https://agent-toolbox.zafermemon87.workers.dev?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: ✓

## Score

- Overall score: 81.2
- Price score: 100
- Accuracy score: 81
- Cost to get started score: 100
- Bundle score: 0
- Performance score: 68

## Price

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

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Domain registration data from RDAP (the successor of WHOIS): registrar, creation, expiry and update dates, status codes, nameservers and DNSSEC.

## Data

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

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: in the call
- Median: 0.15 s

## The call

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

## About the plan

- Plan: Free
- Who can get it: anyone, with no sign-up or API key, limited per IP address

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

domain, registrar, registrar IANA ID, created date, expires date, updated date, status, name servers, DNSSEC, RDAP URL, plain-text summary

## Agent Toolbox's plans (5)

- [Agent Toolbox, free](https://datacircle.dev/domain-whois-apis/agent-toolbox/free/llms.txt): $0.00 per 1,000, 78% complete
- [Agent Toolbox, pay as you go](https://datacircle.dev/domain-whois-apis/agent-toolbox/pay-as-you-go/llms.txt): $2.00 per 1,000, 78% complete
- [Agent Toolbox, $1 pack](https://datacircle.dev/domain-whois-apis/agent-toolbox/1-pack/llms.txt): $2.00 per 1,000, 78% complete
- [Agent Toolbox, $5 pack](https://datacircle.dev/domain-whois-apis/agent-toolbox/5-pack/llms.txt): $1.818 per 1,000, 78% complete
- [Agent Toolbox, $20 pack](https://datacircle.dev/domain-whois-apis/agent-toolbox/20-pack/llms.txt): $1.667 per 1,000, 78% complete

## Agent Toolbox's calls for this API (2)

- `GET /free/whois`: [Agent Toolbox, free](https://datacircle.dev/domain-whois-apis/agent-toolbox/free/llms.txt)
- `GET /v1/whois`: [Agent Toolbox, pay as you go](https://datacircle.dev/domain-whois-apis/agent-toolbox/pay-as-you-go/llms.txt)

## Agent Toolbox's APIs (5)

- [Agent Toolbox: domain WHOIS API pricing, 5 plans](https://datacircle.dev/domain-whois-apis/agent-toolbox/free/llms.txt)
- [Agent Toolbox: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/agent-toolbox/free/llms.txt)
- [Agent Toolbox: web scraping API pricing, 5 plans, POST /free/extract](https://datacircle.dev/web-scraping-apis/agent-toolbox/free-post-free-extract/llms.txt)
- [Agent Toolbox: web scraping API pricing, 5 plans, GET /free/markdown](https://datacircle.dev/web-scraping-apis/agent-toolbox/free-get-free-markdown/llms.txt)
- [Agent Toolbox: business verification API pricing, 4 plans](https://datacircle.dev/business-verification-apis/agent-toolbox/pay-as-you-go/llms.txt)
- [Agent Toolbox: company enrichment API pricing, 4 plans, GET /v1/company/lei](https://datacircle.dev/company-enrichment-apis/agent-toolbox/pay-as-you-go-x402-pay-per-call-get-v1-company-lei/llms.txt)
- [Agent Toolbox: company enrichment API pricing, 4 plans, GET /v1/company/us](https://datacircle.dev/company-enrichment-apis/agent-toolbox/pay-as-you-go-x402-pay-per-call-get-v1-company-us/llms.txt)

## Agent Toolbox: domain WHOIS API alternatives

- [WhoisJSON, free](https://datacircle.dev/domain-whois-apis/whoisjson/free/llms.txt): $0.00 per 1,000, 89% complete, 3 hours
- [Enterno, free, Scout](https://datacircle.dev/domain-whois-apis/enterno/free-scout/llms.txt): $0.00 per 1,000, 89% complete, live
- [IPAddress.to, free](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt): $0.00 per 1,000, 89% complete, live
- [Robtex, free](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [VebAPI, free](https://datacircle.dev/domain-whois-apis/vebapi/free/llms.txt): $0.00 per 1,000, 89% 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://agent-toolbox.zafermemon87.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-toolbox.zafermemon87.workers.dev/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-toolbox.zafermemon87.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent-toolbox.zafermemon87.workers.dev/openapi.json?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