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Utilities Free tier

domain_check

$0.00 per call

Instant domain availability and DNS intelligence. Check if a domain is registered, get WHOIS data, DNS records, nameservers, and registration dates. Essential for startup naming, brand protection, and domain portfolio management..

Start for $5 Try It Live Docs

Quick start

# REST API

curl -X POST https://api.50c.ai/tools/domain_check \

-H "Authorization: Bearer cv_YOUR_KEY" \

-H "Content-Type: application/json" \

-d '{"domain": "example.com"}'

PLAYGROUND

Live API
Get a key for $5 →
POST /tools/domain_check 
Click "Run domain_check" to see results...

HOW TO USE

1

Get an API Key

Credit packs start at $5. Get your key instantly from the dashboard.

2

Call the API

REST API, MCP (Cursor/Claude), or CLI. Use the playground above to test.

3

Pay Per Call

domain_check costs $0.00 per call. No subscriptions required.

PROBLEMS DOMAIN_CHECK SOLVES

When should you use domain_check?

Checking domain availability for new projects

DNS reconnaissance for security audits

Brand protection monitoring

Finding available domains for startup names

USE CASES

What can you build with domain_check?

Check domain availability when naming a product

Audit DNS configuration

Verify domain ownership

Research competitor domain infrastructure

FREQUENTLY ASKED QUESTIONS

Common questions about domain_check

Does it check all TLDs?

Yes, it checks availability across major TLDs including .com, .ai, .io, .dev, and more.

HOW DOMAIN_CHECK COMPARES

Domain Check vs alternatives

alternative to WHOIS API alternative to Namecheap API faster than manual WHOIS lookups

domain_check is part of 50c.ai's 127-tool platform. All tools work via REST API, MCP (Cursor, Claude Desktop, Windsurf), and CLI. Start for $5 with pay-as-you-go pricing.

domain_check is an AI-powered domain check tool for developers, DevOps engineers, and technical teams. Available as an MCP tool for Cursor, Claude Desktop, and Windsurf, as a REST API at api.50c.ai/tools/domain_check, and via CLI with npx 50c run domain_check. Part of the Utilities suite on the Free tier. Free to use. Get started with a $5 credit pack at 50c.ai.

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Try domain_check now

Part of the Free tier · $0.00 per call

Get started with a $5 credit pack — enough for unlimited free calls.

Start for $5 View Plans