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Whois JSON API

Effortlessly retrieve accurate WHOIS details for any domain with our REST API. Perform bulk WHOIS queries and check URL availability in real time, all in a structured JSON format for seamless integration into your applications.

Dev Tools · Founded 2021 · United States

Dev Tools
SaaS
Security

Visit whoisjsonapi.com ↗Founder interest ↓

Can you vibecode this?

Yes

WHOIS/RDAP queries, DNS lookups, bulk domain checks, and availability checks are all standard API calls a builder wires up cleanly. The monitoring dashboard with webhooks and change history adds scope but nothing that blocks a solo developer.

Build This with Leapd →

The business

Total revenue

$40K+

Verified recently

Monthly revenue

$1K+/mo

→ Steady · 60-day average

Peak month

~$2K

Best single month

Growth

−30%

Early months vs recent

For owners

Own Whois JSON API? List it for sale.

Founders read this page looking for a business to build like your $1K+/mo one — some would rather buy one that already works. They skip the line, you get a clean exit. $25 one-time, no commission.

Why it works

Value proposition
One API returns structured WHOIS, RDAP, DNS and domain availability data.
Problem
Querying domain registries and DNS directly is fragmented and unstructured.
Audience
Developers and companies building security, monitoring and domain workflows.
Business model
Monthly subscriptions tiered by API credit volume and monitoring capacity, with a 7-day free trial.

Good to know7-day free trialNo credit card requiredCancel anytimeBasic, Premium, Enterprise tiers

Can you vibecode this?

Yes

Moat

Proprietary data
Switching costs

Why people pay Whois JSON API

The service has been collecting and serving WHOIS data since 2018, building a history of over 500 million domain records that a new copy lacks on day one. Customers who integrate the API into security, monitoring, and domain workflows accumulate change history and configured alerts that are lost if they switch.

Product complexity
Moderate
The product combines a REST API, a dashboard and continuous domain monitoring with webhooks and email alerts.
Data
Moderate
Live WHOIS, RDAP and DNS data is fetched from public registries and DNS infrastructure via their APIs.
Integrations & infrastructure
Low
Outbound webhooks to customer endpoints are the only named external integration.
Human operations
Low
Continuous domain monitoring runs on scheduled checks with no human intervention required.
Regulation / hardware
Low
No regulated data types or industry-specific compliance requirements apply to domain lookup APIs.

Build this business

Use the build specification below with any AI coding tool, or build it directly with Leapd.

Build This with Leapd →

Leapd builds

REST API with WHOIS, DNS, bulk lookup, availability and monitoring dashboard
Monthly subscriptions tiered by credit volume and monitoring capacity with Stripe
Customer webhook endpoints connection
A landing page

Leapd runs

Cold email outreach to potential customers
Meta ads
LinkedIn and X posts
SEO and AI-search visibility
A daily report of what shipped

Opportunity check

Passes: Proven market: $1K+/mo already paid for it
Passes: Proven model: Monthly subscription: Basic, Premium or Enterprise by credit volume
Passes: Proven need: Developers need domain data on demand
Passes: Buildable: Leapd builds it end to end

build-spec.txt

Build a REST API platform that sells structured domain intelligence data through tiered monthly subscriptions.

Product:
- Bearer-token REST API returning structured JSON WHOIS and RDAP records for any domain
- DNS Records API returning live answers grouped by type for A, AAAA, MX, NS, TXT, CNAME, SOA and CAA records
- Bulk WHOIS endpoint accepting up to 20 domains per request and returning per-domain results
- Domain availability API for checking whether a domain is open for registration
- Signed-in customer dashboard for configuring and viewing domain monitoring across WHOIS, RDAP and DNS sources
- Domain monitoring that tracks registration, nameserver, status, expiration and DNS record changes over time
- Change history view showing previous and current values for each detected change
- Email alerts sent immediately when a monitored domain change is detected
- Outbound signed webhook delivery to one configured customer endpoint per eligible plan
- API key management and usage dashboard showing credit consumption against plan limits
- 7-day free trial with no credit card required

Billing:
- Three monthly subscription tiers (Basic, Premium, Enterprise) priced by API credit volume and monitoring capacity, charged with Stripe.

Integrations:
- Customer-configured webhook endpoints connected via their own endpoint URLs for outbound monitoring event delivery.

Data:
- Public WHOIS and RDAP registries connected via their public APIs for domain registration data
- Live DNS infrastructure queried via public DNS APIs for real-time record answers