# Nero Labs, pay as you go: Domain WHOIS API

> Looks up up to 15 domains in the official RDAP registries (the modern WHOIS): when each was registered and how old it is, when it expires, the registrar, status codes and name servers. Flags new domains and ones about to expire.

Nero Labs'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. Nero Labs's docs list 7: Registrant, Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
We haven't run Nero Labs 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/nero-labs/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://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `POST https://x402-agent-tools.nerolabs.workers.dev/whois`
- API key: not needed
- Its API docs: https://x402-agent-tools.nerolabs.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1whois
- Sold by: Nero Labs (https://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 78%
- Registrant: ✓
- Registrar: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Price

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

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Looks up up to 15 domains in the official RDAP registries (the modern WHOIS): when each was registered and how old it is, when it expires, the registrar, status codes and name servers. Flags new domains and ones about to expire.

## Data

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

## Plan

- Pay: per call

## Rate limit

- Batch: 15

## Speed

- Answer: in the call

## The call

- You send: one of domains or rows. Optional: domainField, keep, expiringWithinDays, newerThanDays, includeRegistrantOrganization
- Method: POST
- Path: /whois

## 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 47 fields the plan's answer can hold

input, domain, lookup status, lookup status detail, registered, created date, expiry date, last changed date, age in days, age in years, days until expiry, expired, expiring soon, new domain, registrar name, registrar IANA ID, name servers, name server count, DNSSEC, domain locked, pending delete, status, registrant organization, registrant country, contact data redacted, RDAP server, checked at, input row count, unique domains, domains answered, registered count, unregistered count, output row count, status counts, top registrars, expiring soon count, new domain count, oldest domain, newest domain, unsupported TLDs, registry terms blocked TLDs, retried domains, registry requests, server list published, duration, data note, warnings

## Nero Labs's plans (1)

- [Nero Labs, pay as you go](https://datacircle.dev/domain-whois-apis/nero-labs/pay-as-you-go/llms.txt): $5.00 per 1,000, 78% complete, live

## Nero Labs's calls for this API (1)

- `POST /whois`: [Nero Labs, pay as you go](https://datacircle.dev/domain-whois-apis/nero-labs/pay-as-you-go/llms.txt)

## Nero Labs's APIs (6)

- [Nero Labs: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/ireland](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-ireland/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/uk-risk-report](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk-risk-report/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/uk-trust-check](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk-trust-check/llms.txt)
- [Nero Labs: company enrichment API pricing, 1 plan, POST /company/poland](https://datacircle.dev/company-enrichment-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-poland/llms.txt)
- [Nero Labs: company enrichment API pricing, 1 plan, POST /company/uk](https://datacircle.dev/company-enrichment-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk/llms.txt)

## Nero Labs: 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
- [DomainRef, pay as you go, Pay per call, GET /v1/domain/age](https://datacircle.dev/domain-whois-apis/domainref/pay-as-you-go-pay-per-call-get-v1-domain-age/llms.txt): $5.00 per 1,000, 78% complete, live
- [Genexxis, pay as you go, x402 pay per call, GET /domain-info](https://datacircle.dev/domain-whois-apis/genexxis/pay-as-you-go-x402-pay-per-call-get-domain-info/llms.txt): $5.00 per 1,000, 78% 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://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing