Back to all APIs
Validation

CheckCheck.
One API Key.

Domain availability checking with bulk support and TLD suggestions

Get Started FreeAlso available on RapidAPI →
Stateless API Processing — No request data stored

Features

Instant domain availability checking

Bulk check multiple domains at once

TLD suggestions (.com, .io, .co, .ai)

Premium domain pricing detection

Registrar recommendation

WHOIS data integration

Use Cases

Domain Shopping

Quickly check availability across multiple TLDs when brainstorming domain names for projects.

Brand Launches

Verify domain availability before committing to a brand name or product launch.

Domain Investing

Scan for available domains matching patterns or keywords for domain portfolio building.

Registrar Integration

Power domain search features in website builders or hosting platforms.

Pricing

Start free with 200/month. Scale up as you grow.

Free

200/month

Free
  • 200/month
  • 5/min
  • Hard limit
Get Started

Pro

10k/month

$9.99/mo
  • 10k/month
  • 30/min
  • $0.001/req
Get Started
Best Value

Ultra

100k/month

$49.99/mo
  • 100k/month
  • 150/min
  • $0.0005/req
Get Started

Mega

1M/month

$199/mo
  • 1M/month
  • 500/min
  • $0.00025/req
Get Started

Frequently Asked Questions

Most checks complete in under 200ms. We query authoritative DNS and WHOIS servers for accurate, real-time availability status.
We support 500+ TLDs including all major gTLDs, ccTLDs, and new TLDs like .io, .ai, .app, and .dev.
Yes, bulk checking supports multiple domains and TLD variations in a single request. Perfect for brand name brainstorming.
For supported registrars, we indicate premium domain pricing. Standard registration prices vary by registrar and are not included.

Related APIs

Email Verify API

Validate email addresses with syntax, MX, and disposable checks

Breach Check API

Check if passwords or emails appear in known data breaches

WHOIS API

Domain WHOIS lookup with parsed and raw data

Disposable Email API

Detect disposable and temporary email addresses

View all APIs

Start using CheckCheck API today

Free tier available. No credit card required.

Get Started Free