# Agent402 Tools, pay as you go: Domain WHOIS API

> Domain registration data via RDAP (the structured WHOIS successor): registrar, creation/expiry dates, status, nameservers.

Agent402 Tools's x402 pay per call plan for the domain WHOIS API costs $5.00 per 1,000 domains. We check each provider's docs for 9 fields. Agent402 Tools's docs list 5: Registrar, Created on, Expires on, Name servers, Statuses.
We haven't run Agent402 Tools 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 18% 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/agent402-tools/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://agent402.tools/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `POST https://agent402.tools/api/whois`
- API key: not needed
- Its API docs: https://agent402.tools/tools/whois?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: Agent402 Tools (https://agent402.tools?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: ✓
- Statuses: ✓

## Price

- $ per 1,000 domains: $5.00
- 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: Domain registration data via RDAP (the structured WHOIS successor): registrar, creation/expiry dates, status, nameservers.

## Data

- Keep data: no limit
- Use data: Don't use the service to break the law, infringe others' rights, or attack the service or third parties (e.g. using the URL-fetching tools against targets you don't control). [...] Don't attempt to bypass rate limits, payment, or the proof-of-work gate, or to disrupt availability for others. [...] Don't use the service to create malware or exploits for unauthorized use, to defraud, phish, spam, or deceive, or to process other people's personal data unlawfully. You are responsible for the inputs you send and how you use the outputs.

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain
- Method: POST
- Path: /api/whois

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone at least 18 (or the age of majority where they live, if higher), able to form a binding contract, not barred from receiving services under U.S. or other applicable law, not in an embargoed jurisdiction and not on a U.S. government sanctions list, with no account or API key, paying each call in USDC (or USDG on Robinhood Chain) over x402 or MPP

## The 6 fields the plan's answer can hold

domain, registrar, created date, expiry date, nameservers, status

## Agent402 Tools's plans (1)

- [Agent402 Tools, pay as you go](https://datacircle.dev/domain-whois-apis/agent402-tools/pay-as-you-go/llms.txt): $5.00 per 1,000, 56% complete

## Agent402 Tools's calls for this API (1)

- `POST /api/whois`: [Agent402 Tools, pay as you go](https://datacircle.dev/domain-whois-apis/agent402-tools/pay-as-you-go/llms.txt)

## Agent402 Tools's APIs (14)

- [Agent402 Tools: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: image search API pricing, 1 plan](https://datacircle.dev/image-search-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: news API pricing, 1 plan](https://datacircle.dev/news-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: search autocomplete API pricing, 1 plan](https://datacircle.dev/search-autocomplete-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: video search API pricing, 1 plan](https://datacircle.dev/video-search-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: X post API pricing, 1 plan](https://datacircle.dev/x-post-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: web scraping API pricing, 1 plan, POST /api/render](https://datacircle.dev/web-scraping-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-render/llms.txt)
- [Agent402 Tools: web scraping API pricing, 1 plan, POST /api/extract](https://datacircle.dev/web-scraping-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-extract/llms.txt)
- [Agent402 Tools: web search API pricing, 1 plan, GET /api/search](https://datacircle.dev/web-search-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-get-api-search/llms.txt)
- [Agent402 Tools: web search API pricing, 1 plan, GET /api/search-lite](https://datacircle.dev/web-search-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-get-api-search-lite/llms.txt)
- [Agent402 Tools: X profile API pricing, 1 plan, POST /api/x-users-lookup](https://datacircle.dev/x-profile-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-x-users-lookup/llms.txt)
- [Agent402 Tools: X profile API pricing, 1 plan, POST /api/x-user](https://datacircle.dev/x-profile-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-x-user/llms.txt)

## Agent402 Tools: domain WHOIS API alternatives

- [How.is, pay as you go](https://datacircle.dev/domain-whois-apis/how-is/pay-as-you-go/llms.txt): $5.00 per 1,000, 56% complete, live
- [fetcher.cloud, pay as you go](https://datacircle.dev/domain-whois-apis/fetcher-cloud/pay-as-you-go/llms.txt): $5.00 per 1,000, 44% complete, live
- [AgentUtility, pay as you go, Pay per call (x402), POST /whois](https://datacircle.dev/domain-whois-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-whois/llms.txt): $5.00 per 1,000, 67% complete
- [appin60, pay as you go](https://datacircle.dev/domain-whois-apis/appin60/pay-as-you-go/llms.txt): $5.00 per 1,000, 56% 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://agent402.tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/api/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agent402.tools/tools/whois?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing