# DomainIndex, $39 monthly: Domain WHOIS API

> The DomainIndex API allows you to integrate data from our appraisal system into your own applications. DomainIndex API is using standard HTTP requests and can provide responses in XML and JSON formats.

DomainIndex's domain WHOIS API on its Domainer plan. It costs $0.78 per 1,000 domains. DomainIndex's docs list 4 of the 9 fields on our checklist: Registrant, Created on, Expires on, Name servers.
We haven't run DomainIndex through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
Half of the 316 plans we rank by price cost $1.495 per 1,000 domains or less. This plan costs less per 1,000 domains than 84% of the 316 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.
[Robtex](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt), [DomScan](https://datacircle.dev/domain-whois-apis/domscan/6-monthly-starter-post-v1-whois-bulk/llms.txt) and [WhoisFreaks](https://datacircle.dev/domain-whois-apis/whoisfreaks/200-monthly-monthly-subscription-150000-api-credits-post-v2-0-bulkwhois-live/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/domainindex/39-monthly
- [Domain WHOIS API: the 13 best providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://domainindex.com/subscriptions?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://domainindex.com/api.php`
- API key: with the plan, on https://domainindex.com/subscriptions?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Its API docs: https://domainindex.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: DomainIndex (https://domainindex.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 44%
- Registrant: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓

## Price

- $ per 1,000 domains: $0.78
- Per: result
- Billing: monthly
- $ a month: $39

## Charges

- Also pays for: from the same budget: Appraise · Price · Searches · Keyword detection · Alexa · Domain availability · Overture · Traffic estimator · Trademark probability · Udrps · Wiki · Dmoz

## Overage

- Units cap: hard

## In their words

- Their pitch: The DomainIndex API allows you to integrate data from our appraisal system into your own applications. DomainIndex API is using standard HTTP requests and can provide responses in XML and JSON formats.

## Data

- Keep data: no limit
- Use data: You agree not to reproduce, duplicate, copy, sell, trade, resell, modify, create derivative works, or exploit for any commercial purposes, any part of the Service, use of the Service, or access to the Service or computer code that powers the Service, unless expressly authorized to do so by Domainindex.com.

## Plan

- Pay: $39
- You get: 50,000 results a month
- Enough for: 50,000 results a month

## Rate limit

- Per second: 10
- Batch: 1,000

## Speed

- Answer: in the call

## The call

- You send: action "whois", domain, mode "json" or "xml"
- Method: GET
- Path: /api.php

## About the plan

- Plan: Domainer
- Who can get it: anyone who registers an account and is of legal age to make a binding contract

## The 23 fields the plan's answer can hold

domain name, creation date, domain age, expiration date, name servers, WHOIS last update date, owner name, admin name, technical name, billing name, owner email, admin email, technical email, billing email, owner phone, admin phone, technical phone, billing phone, owner fax, admin fax, technical fax, billing fax, appraisal page URL

## DomainIndex's plans (7)

- [DomainIndex, $39 monthly](https://datacircle.dev/domain-whois-apis/domainindex/39-monthly/llms.txt): $0.78 per 1,000, 44% complete
- [DomainIndex, $99 monthly](https://datacircle.dev/domain-whois-apis/domainindex/99-monthly/llms.txt): $0.396 per 1,000, 44% complete
- [DomainIndex, $299 monthly](https://datacircle.dev/domain-whois-apis/domainindex/299-monthly/llms.txt): $0.299 per 1,000, 44% complete
- [DomainIndex, $590 monthly](https://datacircle.dev/domain-whois-apis/domainindex/590-monthly/llms.txt): 44% complete
- [DomainIndex, $1,040 monthly](https://datacircle.dev/domain-whois-apis/domainindex/1040-monthly/llms.txt): 44% complete
- [DomainIndex, $1,670 monthly](https://datacircle.dev/domain-whois-apis/domainindex/1670-monthly/llms.txt): 44% complete
- [DomainIndex, $2,450 monthly](https://datacircle.dev/domain-whois-apis/domainindex/2450-monthly/llms.txt): 44% complete

## DomainIndex's calls (1)

- `GET /api.php`: [DomainIndex, $39 monthly](https://datacircle.dev/domain-whois-apis/domainindex/39-monthly/llms.txt)

## DomainIndex's APIs (1)

- [DomainIndex: domain WHOIS API pricing, 7 plans](https://datacircle.dev/domain-whois-apis/domainindex/39-monthly/llms.txt)

## DomainIndex: domain WHOIS API alternatives

- [Leadgen Romania, €9 monthly](https://datacircle.dev/domain-whois-apis/leadgen-romania/9-monthly/llms.txt): $0.675 per 1,000, 67% complete
- [DomScan, $269 pack, 1,000,000 credits, POST /v1/whois/bulk](https://datacircle.dev/domain-whois-apis/domscan/269-pack-1000000-credits-post-v1-whois-bulk/llms.txt): $0.807 per 1,000, 100% complete
- [HackerTarget, $300 yearly](https://datacircle.dev/domain-whois-apis/hackertarget/300-yearly/llms.txt): $0.822 per 1,000, 89% complete, live
- [Netlas, $249 monthly](https://datacircle.dev/domain-whois-apis/netlas/249-monthly/llms.txt): $0.83 per 1,000, 89% complete, 45 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 2026-11-06.

- https://domainindex.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domainindex.com/subscriptions?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://domainindex.com/terms-of-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing