# AgentUtility, pay as you go, Pay per call (x402), POST /whois: Domain WHOIS API

> WHOIS API for agents, backed by the IANA-mandated RDAP endpoint.

AgentUtility's Pay per call (x402) plan for the domain WHOIS API costs $5.00 per 1,000 domains. AgentUtility's docs list 6 of the 9 fields on our checklist: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
We haven't run AgentUtility through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
We rank 363 plans for domain WHOIS APIs by price. Half the plans cost $1.50 or less per 1,000 domains. This plan costs less per 1,000 domains than 12% of the 363 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.
[Enterno](https://datacircle.dev/domain-whois-apis/enterno/free-open-api/llms.txt), [IPAddress.to](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt) and [Robtex](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-whois
- [Domain WHOIS API: the 19 best of 70+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://agentutility.ai/web-probe/whois?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `POST https://x402.agentutility.ai/whois`
- API key: not needed
- Its API docs: https://agentutility.ai/web-probe/whois?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: AgentUtility (https://agentutility.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 67%
- Registrar: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Price

- $ per 1,000 domains: $5.00
- Per: call
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: WHOIS API for agents, backed by the IANA-mandated RDAP endpoint.

## Data

- 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. Optional: include_certificates
- Method: POST
- Path: /whois

## About the plan

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

## The 13 fields the plan's answer can hold

domain, RDAP server, registration date, expiry date, domain age days, days until expiry, registrar, registrar IANA ID, nameservers, DNSSEC signed, status, risk signals, certificate summary

## AgentUtility's plans (1)

- [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

## AgentUtility's calls for this API (2)

- `POST /whois`: [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)
- `POST /whois-lookup`: [AgentUtility, pay as you go, Pay per call (x402), POST /whois-lookup](https://datacircle.dev/domain-whois-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-whois-lookup/llms.txt)

## AgentUtility's APIs (8)

- [AgentUtility: search autocomplete API pricing, 1 plan](https://datacircle.dev/search-autocomplete-apis/agentutility/pay-as-you-go/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /b2b-lead-enrich](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-b2b-lead-enrich/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /contact-enrich](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-contact-enrich/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /lead-enrich](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-lead-enrich/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /people-enrich](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-people-enrich/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /people-search](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-people-search/llms.txt)
- [AgentUtility: people enrichment API pricing, 1 plan, POST /person-enrich](https://datacircle.dev/person-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-person-enrich/llms.txt)
- [AgentUtility: web scraping API pricing, 1 plan, POST /browser-render](https://datacircle.dev/web-scraping-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-browser-render/llms.txt)
- [AgentUtility: web scraping API pricing, 1 plan, POST /scrape](https://datacircle.dev/web-scraping-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-scrape/llms.txt)
- [AgentUtility: web scraping API pricing, 1 plan, POST /scrape-website](https://datacircle.dev/web-scraping-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-scrape-website/llms.txt)
- [AgentUtility: web scraping API pricing, 1 plan, POST /url-to-markdown](https://datacircle.dev/web-scraping-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-url-to-markdown/llms.txt)
- [AgentUtility: company enrichment API pricing, 1 plan, POST /company-dossier](https://datacircle.dev/company-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-company-dossier/llms.txt)
- [AgentUtility: company enrichment API pricing, 1 plan, POST /company-enrich](https://datacircle.dev/company-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-company-enrich/llms.txt)
- [AgentUtility: company enrichment API pricing, 1 plan, POST /company-intel-pack](https://datacircle.dev/company-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-company-intel-pack/llms.txt)
- [AgentUtility: company enrichment API pricing, 1 plan, POST /domain-enrich](https://datacircle.dev/company-enrichment-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-domain-enrich/llms.txt)
- [AgentUtility: news API pricing, 1 plan, POST /crypto-news](https://datacircle.dev/news-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-crypto-news/llms.txt)
- [AgentUtility: news API pricing, 1 plan, POST /stocks-news](https://datacircle.dev/news-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-stocks-news/llms.txt)
- [AgentUtility: email verification API pricing, 1 plan, POST /disposable-email-check](https://datacircle.dev/validate-email-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-disposable-email-check/llms.txt)
- [AgentUtility: email verification API pricing, 1 plan, POST /email](https://datacircle.dev/validate-email-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-email/llms.txt)
- [AgentUtility: email verification API pricing, 1 plan, POST /email-deliverability-check](https://datacircle.dev/validate-email-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-email-deliverability-check/llms.txt)
- [AgentUtility: Hacker News search API pricing, 1 plan, POST /hacker-news-search](https://datacircle.dev/hacker-news-search-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-hacker-news-search/llms.txt)
- [AgentUtility: Hacker News search API pricing, 1 plan, POST /hn-search](https://datacircle.dev/hacker-news-search-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-hn-search/llms.txt)
- [AgentUtility: domain WHOIS API pricing, 1 plan, POST /whois](https://datacircle.dev/domain-whois-apis/agentutility/pay-as-you-go-pay-per-call-x402-post-whois/llms.txt)

## AgentUtility: domain WHOIS API alternatives

- [agentsvc.io, pay as you go](https://datacircle.dev/domain-whois-apis/agentsvc-io/pay-as-you-go/llms.txt): $4.50 per 1,000, 78% complete
- [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
- [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
- [Call402, pay as you go](https://datacircle.dev/domain-whois-apis/call402/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 2026-11-08.

- https://agentutility.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agentutility.ai/start?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://agentutility.ai/web-probe/whois?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402.agentutility.ai/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402.agentutility.ai/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing