# ToolCall, pay as you go: Domain WHOIS API

> Due-diligence check on any domain: registration age via RDAP, registrar, DNS posture (A/MX/NS), SPF and DMARC presence, SSL certificate history, and risk flags like newly-registered or no-mail-setup. One call, one JSON verdict.

ToolCall's x402 pay per call plan for the domain WHOIS API costs $8.00 per 1,000 domains. We check each provider's docs for 9 fields. ToolCall's docs list 1: Registrar.
We haven't run ToolCall 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 16% 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/toolcall/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://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://toolcall.click/t/domain/check`
- API key: not needed
- Its API docs: https://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1t~1domain~1check
- Sold by: ToolCall (https://toolcall.click?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 11%
- Registrar: ✓

## Price

- $ per 1,000 domains: $8.00
- Per: call
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Due-diligence check on any domain: registration age via RDAP, registrar, DNS posture (A/MX/NS), SPF and DMARC presence, SSL certificate history, and risk flags like newly-registered or no-mail-setup. One call, one JSON verdict.

## 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
- Method: GET
- Path: /t/domain/check

## About the plan

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

## The 8 fields the plan's answer can hold

domain, domain age in days, registrar, has MX record, has SPF record, has DMARC record, risk flags, trust score

## ToolCall's plans (1)

- [ToolCall, pay as you go](https://datacircle.dev/domain-whois-apis/toolcall/pay-as-you-go/llms.txt): $8.00 per 1,000, 11% complete

## ToolCall's calls for this API (1)

- `GET /t/domain/check`: [ToolCall, pay as you go](https://datacircle.dev/domain-whois-apis/toolcall/pay-as-you-go/llms.txt)

## ToolCall's APIs (7)

- [ToolCall: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: job postings API pricing, 1 plan](https://datacircle.dev/job-posting-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: local business search API pricing, 1 plan](https://datacircle.dev/local-business-search-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: news API pricing, 1 plan](https://datacircle.dev/news-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: web search API pricing, 1 plan](https://datacircle.dev/web-search-apis/toolcall/pay-as-you-go/llms.txt)

## ToolCall: 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
- [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
- [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
- [ScrapeWhale, $49.90 pack](https://datacircle.dev/domain-whois-apis/scrapewhale/49-90-pack/llms.txt): $8.317 per 1,000, 78% complete, 7 days

## 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://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://toolcall.click?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://toolcall.click/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://toolcall.click/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing