100% Free Tools
Free Email Intelligence Tools
Verify emails, find contacts, check domain health, and analyze authentication records — all for free. No credit card required.
Developer API
Build Email Intelligence Into Your Product
Our REST API delivers verification results in under 500ms. Perfect for real-time signup forms, CRM enrichment, and automated workflows. Full documentation with code examples in Python, JavaScript, Ruby, and PHP.
api-example.sh
curl "https://api.sindboxintel.io/v1/verify" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{"email": "john@company.com"}'
{
"email": "john@company.com",
"status": "VALID",
"score": 94,
"deliverable": true,
"mx_found": true,
"smtp_check": true,
"disposable": false,
"catch_all": false,
"risk_level": "low"
}