# DomainDetails, free, GET /api/rdap: Domain WHOIS API

> Domain information lookup API providing WHOIS/RDAP data, marketplace search, and pricing information.

DomainDetails's Free plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. DomainDetails's docs list 6: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
DomainDetails limits how many calls you get but gives no number.
In [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt), the best plan from DomainDetails scores 90.6 out of 100. DomainDetails ranks 3rd of 38 providers.
This plan is free. We rank 589 plans for domain WHOIS APIs by price. Half the plans cost $1.67 or less per 1,000 domains. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[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. [UAPI's CNY 4.90 pack](https://datacircle.dev/domain-whois-apis/uapi/cny-4-90-pack/llms.txt) costs the least for 10,000 domains a month: about $0.73.
[thenetworkery](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt), [FluentEDI](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt) and [DomainDetails](https://datacircle.dev/domain-whois-apis/domaindetails/9-99-monthly-alerts-get-api-rdap/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-rdap
- [Domain WHOIS API in 2026: the best of 30+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://domaindetails.com/plans?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.domaindetails.com/api/rdap`
- API key: not needed
- Its API docs: https://api.domaindetails.com/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: DomainDetails (https://domaindetails.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-10

## In the answer

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

## Price

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

## Charges

- Also pays for: WHOIS Lookup (Query Parameter) · WHOIS Lookup (Path Parameter) · DNS Lookup · SSL Certificate Check · Wayback Machine History · Check Domain Pricing

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Domain information lookup API providing WHOIS/RDAP data, marketplace search, and pricing information.

## Data

- Keep data: no limit
- Use data: You are granted a limited, non-exclusive, non-transferable license to: Access and use the Service for personal or internal business purposes [...] Display domain information obtained through the Service [...] Automated access to our Service is subject to the following conditions: [...] Web Service: Automated queries to our website (excluding the MCP server) are prohibited without explicit written permission. [...] Commercial Use: If you wish to integrate our Service into a commercial product or service, please contact us [...] for licensing arrangements.

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: in the call
- Median: 0.41 s

## The call

- You send: domain
- Method: GET
- Path: /api/rdap

## About the plan

- Plan: Free
- Who can get it: anyone

## The 15 fields the plan's answer can hold

domain name, available, availability message, type, status, registrar, creation date, expiration date, DNSSEC, name servers, raw record, lookup protocol, RDAP URL, source type, WHOIS server

## DomainDetails's plans (6)

- [DomainDetails, free, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-rdap/llms.txt): $0.00 per 1,000, 67% complete
- [DomainDetails, $49.99 pack, Aftermarket Insights, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/49-99-pack-aftermarket-insights-get-api-rdap/llms.txt): 67% complete
- [DomainDetails, €9.99 monthly, Alerts, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/9-99-monthly-alerts-get-api-rdap/llms.txt): no limit, 67% complete
- [DomainDetails, €99.99 yearly, Alerts, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/99-99-yearly-alerts-get-api-rdap/llms.txt): no limit, 67% complete
- [DomainDetails, $699 yearly, Full Access Bundle, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/699-yearly-full-access-bundle-get-api-rdap/llms.txt): no limit, 67% complete
- [DomainDetails, contact us, Enterprise, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/contact-us-enterprise-get-api-rdap/llms.txt): 67% complete

## DomainDetails's calls (3)

- `GET /api/rdap`: [DomainDetails, free, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-rdap/llms.txt)
- `GET /api/whois/{domain}`: [DomainDetails, free, GET /api/whois/{domain}](https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-whois-domain/llms.txt)
- `GET /api/whois`: [DomainDetails, free, GET /api/whois](https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-whois/llms.txt)

## DomainDetails's APIs (1)

- [DomainDetails: domain WHOIS API pricing, 6 plans, GET /api/rdap](https://datacircle.dev/domain-whois-apis/domaindetails/free-get-api-rdap/llms.txt)

## DomainDetails: domain WHOIS API alternatives

- [thenetworkery, free](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt): $0.00 per 1,000, 100% complete, live
- [FluentEDI, free](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [DC5 WHOIS, free, Public instance, GET /api/v1/domain](https://datacircle.dev/domain-whois-apis/dc5-whois/free-public-instance-get-api-v1-domain/llms.txt): $0.00 per 1,000, 78% complete
- [WhoisJSON, free](https://datacircle.dev/domain-whois-apis/whoisjson/free/llms.txt): $0.00 per 1,000, 89% complete, 3 hours

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

- https://api.domaindetails.com/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.domaindetails.com/openapi.yaml?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domaindetails.com/features/changelog?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domaindetails.com/legal/tos?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domaindetails.com/plans?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domaindetails.com/plans/enterprise?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domaindetails.com/plans/pro?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing